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1. TOSE F146 RIS 198 I doy C134 RI42 sia Qu e o 9119 p QS RS mo 10 oU SO eie Ies TO aad aa cise arme C 70 EIO RIBI i5k RIZ 19 ojo 23 Cy R148 Te or Q 000000 RIGS IM RIGS 10k 2447 24 ex 5 MHZ REF Rie Ci RI3S 0 295 war Qui C a goes un c 2 085 mo 82 ae 2 N am VHF CONV CIS et 1 out 102 emo esa USO QUE o d E lt C6 Ss et OO EE SHIELD PN 456 2261 Ces OR ciag es 26 frito Y GEMA ORIS Je 20 Bots mola 84 joss LAI R119 urs 51 0 147 84 i RISS 1 5 SS TAE Kon Qua O 8 C O 0 45 6 HD gon 8 Og ia BE Ken 4 652520 Ist LO OUT rez tre 8 oO RIS 2 2K Ogg Oca aO 19 gest sg tora ad 2 809818 od cales GON 2 Og p 148 8158 478 cia d S Oy 1717216 B AT m 2 6 E EC E On 0 110 0 don car fe KEG A EAE amp ogos
2. NOT BE USED COPIED OH REPRODUCED IN WHOLE IN PART DISCLOSEO TO OTHERS WITHOUT THE EXPRESSED WRITTEN PERMISSION OF L DRAKE COMPANY COPYAIGHT 1991 L OMAKE COMPANY TO 00 HIXER 107 45 05MHZ OUT 250 LO TO FACNT END 3524111 Our 100mY C216 I 1 C 4 75 10pF C326 100 o 10v C317 250 6 50 6 7 251 820 HCi45157 C316 1 O1uF 145 1144 a svoc Saon 4700 dis 1 107 133 1 3 2204 l VCO 1 1 1808 43 L A157 A170 1 i 1 8K 0114 270 C163 4 75 9849 1 8Yp CL 3904 Auf FILM 001uF cassas 0147 IX de caes 276 001uF 8152 iuF 7 3563 caoz 270 TANTALUM 1 3553 10K gt 0115 hasa 1 8126 L caba 5 CV 253504 58143 470 roo 12528 Siar E 10V0 p 6359 73 95 FROM t 10pF MICROPROCESSOR 10uF n172 SCHEMATIC 8129 L 10 hee Tc esse A163 1 C141 ATEO 2 50 51HHz 90 C158 8354 140 A442 1109 244 C126 2 Rasa 199ur 2 2K 1 oo22ur ik 5 GuH sen 27 45 5 Bynt 59 2 c258 casa 100 3 44 5 DATA gt C8121 1
3. 121 10pF os 1 169 104HHZ C14 casog 05 552108 18 1 de 1 104 C132 3524124 2 79F 108 1 R102 cioa 100 dur i wir L A103 100K i 8104 p 56K t 1303 2610100 001uF V 47uF 1 1440 1 3624044 i 0104 i 1 79 74098 33 eins 2 8 20pF P t 8114 122 C147 t 22 2 c112 254192 H 10 IN QD TO4UF i SER 9 1 6427 E 1 pe 482485 sra Grose SYNTHESIZER rod ES 749614 ciss 74HC14 GH m H 2510095 C128 T20 10 Asas 81427 vos GND 270 1040 74HC14 Aise 749644 6102 x EN A S dur E i O 40V H C153 ES 4 T 47uF u i Verror Tm 138MHZ U101A T LPCES2AH 1 gt z 3040169 H ym it H 2 25 LL i 11 30 Ciis sem RAR A134 Ar i Ries gt L I T 1 1 t i Lesa i C119 IL iu i 9104 355 i casos ciae i Y 28 132186 10pF PCES 1 Cn103 BOK i 1 isvi53 i 105A 4184 d 1107 ee 166 e 1 3640169 47UF
4. V 1 1 1 1 t I 1 I I i 1 V t 1 I I I 1 1 1 1 4 f t t 1 I 1 t 1 t 1 I 1 1 1 i 1 1 t T I I 1 i t t 1 1 1 1 1 1 1 i 1 1 1 1 1 1 1 1 I 1 1 t I 1 t I I 1 t I 1 49 20 _ VHF Converter Board 21 22 23 24 25 261 schematic D 8215 i E oan 182186 nios CONVERTER cso 1 GATA MIXER SECTION INPUT 8 6478 150 C204 103 IF t 1 BM 3281089 L417 E 2810122 8104 Ride 167 H 100 HX101 414 t109 gt 7 1 cise cise Ribz A 2510102 2510102 IF OUT niue 27 case 120pF i 47pF izopF 22 J102 4 Riso C148 n Mi i Il 220 4TpF 1 Lisa 4142 10 i Kii 2810121 2510121 2810122 gt gt gt d Aisa 4 7K 36 iH Liza 2510069 F 1421 L448 CA118 1126 1127 0109 2530969 8174 2N3904 2840099 8 182185 2 70H 43g C173 47uF CH120 ior 182188 Ch115 182208 8168 100 cA113 cai12 1N751A 1N7B1A
5. 2 List of Schematics and Pictorials 3 Introduction 4 Using the R8 R8E Service Manual 4 Locating a Malfunction 4 Generalized Theory of Operation 5 Frequency 6 Circuit Description 11 Front End Board Theory of Operation 1I Theory of Operation 2nd IF 19 19 Step Variable 19 IF Amp and AGC Generator 19 AM and SSB Detectors 19 Audio Processing en 20 5 VDC Generator 20 Synthesizer Microprocessor Theory of Operation 29 18 29 Reference Oscillator 29 Inner Loop PLL3 29 Middle Loop PLL2 30 Outer Loop PLL I 31 2nd LO PBT Pass Band Tuning 32 BFO Digital Mixer 32 VHF Reference 32 Digital Section Theory of Operation 45 Microprocessor and Memory
6. Ju nu e 885 Ne ro cu Da gt C 5 A 2 e D S 2nd IF Audio Power Supply 28 Board Pictorial D 7974 Note This drawing applies to R8 R8E units with Revision printed circuit board artwork 2 3 4 7 8 9 10 II 13 15 16 17 18 19 20 21 22 23 24 25 4 8 36 s 55 DIN LINE LINE EXT gg gg gg 58 KHZ IN BLANKING 82381553 2 8 ev MUTE AUDIO AUDIO SPKR B FROM MIXER THRES p xm EE RBT Took Til V Sie r a ra I O 8 58 gt CIMAS 1 355 5 1 eg XXI T idi gt 9 2 MEL gt i 0 TIAL lt A 74 0 gia 8 3 olgasi O ant 000000 ou amp SIBI 612 Ove pra 522 gg CN ol o 2 Gm E C Rica 88 o eere d Ji e mie eo 55660600 i GAL a qu e 000 DAA E io AE 00000800 alal QU al 94 Wag ii 2511000 00900 y EN E cae 9 00096 MO 5555356 PS gt 9900 dul ot
7. Ta BOKHZ SYNCHRONOUS DETECTOR i 100KHZ a TONE 8 2Vpp 157 2 BVDC sur 137 TONE 047uF 100K SEE NOTE 4 48Vpp 10V Bv 2 c127 2ur Ll H gt 4 2 2K 402 8KHz MUST LET STABALIZEI 5 2Ypp 2 8 y FROM FRONT PANEL FROM 4106 PIN 5 HIGH NOTCH OFF 0110 C138 1000 12 1N4148 C103 iuF MET FILM 13 44148 D C202 C 84 S2uF 100 0 KHZ coax Gaze cR100 1N414B THIS DOCUMENT CONTAINS INFORMATION WHICH J109 re A153 132 a C26 0102 Ri29 1 4 t T 5 cat L L SQUELCH 18 CONFIDENTIAL AND PROPRIETARY ANO IT IS 7 4 NOT 10 BE USED COPIED OR R PROOUCEO IN 18397 ceva 7 RESISTOR WHOLE iN PART DISCLOSED TO OTHERS Szur WITHOUT THE EXPRESSED WAITTEN PERMIBSION INOUCT OF 8 L DRAKE COMPANY 5V GENERATOR 6152 COPYRIGHT 1991 DRAKE COMPANY 4 NOTSE BLANKER A367 4215 6 7 a 10 RIGI 270K FROH J106 PIN 30 0356 2N3904
8. 7 592 0 ATTEN ENA gt lal 29 pon E m o lt 5 e 9 5 T 5 2 X COPYRIGHT sss2 L DRAKE COMPANY 18 19 26 i HE 217 iS 23 24 gr 2 WHEEL 221 A348 FACTORY 158 10K L SCALE SET 31 10 P104 32 6 1 PBT OSCILLATOR E V110 H o lt DIE BOY a ln ns se me i 2 1 27 21 COMPUTER INTERFACE 0380 6 357 V Ei xt 1 01308 8355 5 izm e 10K POT 6 2K 200K A384 deve 5 10K zego R82 7 p B o a emnt ed 1 457 3 FRONT PANEL PBT CONTROL 1 i VHF INTERFACE LL ren y os R358 40K ER 5 0146 131 C gt 243804 1N4734 E SH gt EX SH gt 5 SH gt i 22 gt 8 GH ci gt THIS DOCUMENT CONTAINS INFORMATION WHICH ori 9 IS CONFIOENTIAL AND PROPRIETARY IT IS STERE gt NOT TO BE USED COPIED OR IN WHOLE IN PART OISCLOSEO TO OTHERS TO FRONT PANEL TO FRONT PANEL WITHOUT TH
9. RE O te73 0o Beet CORSO mur Queso 04 ga o QR emo Om o gt 3 OQ zb e umo 2 e in 9 Q SOKHZ 2 2 RIED 8 gt 6134 4 7 183 2 O GEMET e c RICH 478 pere Eo B eso gon duo Occ iO E n SHIELD COVER LX OUO woni omo TI CI i 2 5 d e i oe SPRF o a 262 Dos 92 ae o sea 251582 TA ii uam e 2 79 Era Ks E a NET MEME OO Const er Cn E C222 6 1 il oe 12 65 o7 5 70 seus O GED m og Po 98 10 152X CI a So 4 0 XE OO w ANT 1 IN ue cies ga O O Ue um VHF CONV IN DO ca 0 MN S OO I gt RIGI 2 CI25 m zar 8 oe ee 2 mo 126 m L 5 s 9 1 PREAMP ENABLE CRIES 192196 RIES os ATTEN ENABLE ES 00 OO Os mo 4 7 E CRI 152106 0 n RISI 4 7 d 2 RIS 4 27 RIS3 4 7K en 18 5 15HHz 15 22MHz 22 THIS DOCUMENT CONTAINS INFORMATION HHICH IS CONFIDENTIPL AND PROPRIETARY AND IT 15 NOT TO
10. 652 lO Risa ieac oH IS COMIDENTIRt AND PROPRIETARY IT 22uF CI42 VALU 5 IS NOT TO BE USED COPIED OR REPRODUCED frp Oanl Oo 2301 0 0 A O Rica e Dar ioc 88 PREAMP ENABLE MR 13 228 cin e20 5 K QO x 30 Os iO ZO s i OTHERS WITHOUT THE EXPRESSED ARITTEN 0 Q LI K O C238 I82 ATTEN ENABLE PERMISSION OF THE R DRAKE COMPRA S MEN oeQ gt CRIGS iS218 amp CRIB 152186 CCI09 152185 CRI11 152106 0 9 AO NI HF CONV 152186 CRIB3 152186 Sa 152186 CRI21 152188 CR126 152188 6 OO Oj 94 COPYRIGHT 1392 R DRONE Lo Oil R139 4 7K uem y 8 6 Cee 6 i 2 ANT ZANT2 C 5 RIA 4 7K 4 2 4 7K ee O 4 7K c231 5 6 oz pen E M D3 E D 2146 4 7K C257 lul j _ 02 1 1 6 I H 1 3288728 Di i 1 P197 1 i 1 ae 4 LAS mr te SS m Fe ul 5 5 Saz 1 5 2 5MHz 2 5 4 4 0 2 5 2 7 5 10 5MHz 1 5 15MHz 15 22MHz 22 30MHz 2ND IF THEORY OF OPERATION 1 Noise Blanker 2 Step Variable BPF 3 IF AMP and AGC Generator 4 AM and SSB Detectors 5 Audio Processing 6 5V Ge
11. ay 4 0 10V 596 ev o5 45 1 75 0HHz 4 425 1 327 A183 C186 av O 680 O01uF lol 22001 357 LO TO 152208 sopu C233 1 FRONT 106 NC NC c229 c230 c231 Us 55 0 55 1HHz 1 56 22pF 3563 nio 6109 _ 75027 32 0919 13 2 I 3 I 6 10V 9 30 caga 4 9 5 0 MHZ V 1VDC L142 443 c312 gt 200mV 27uH 01 C 5 0 5 1HHz c220 E 0132 200mV 10pF C274 2M3904 4 9voc 2 39 06 A186 8247 4109 65 0 65 1 9 750mv 0 C 4 75V0 C256 iur c232 T 10V 65 0 65 1HH2 750mv c254 4 70F 152208 IL 8207 0422 8209 R208 10K 3563 ol 100K 1 x 0 t 10pF oo 1126 127 D ces MB467 2 22uH gun l 4 mar peer KP IV lae Pios 3524 gt 7 m NC NC c229 c230 C234 m L134 65 0 65 1MHz 0039 22pF S6pF 22 LI PLL2 PLL 1 45 1 75 0MHz 18
12. He c v LA 5 C1 85 R3 Re NC zm d REAR VIEW OF PC BD 2 KEYPAD SCHEMATIC ART 0 7977 C4 ca ca cs 82 C7 83 e 7 3 7 265432 14 REAR VIEW OF PC FrontPanelBoardSchematic 53 2 3 4 15 6 I 7 9 40 11 12 431 14 181 16 216 101 100 iur JUE 8105 8104 4 2K 470 128 05 KHZ SQUARE WAVE A110 2 4 0 180K 128 05 KHZ erri WAVE uPD7225 LAMPS B 1VOC DIM S avoc 4 BACKPLANE 32 SEGMENT DRIVES DRIVES 8 CHAO OFF OFF 1 0 80 834 COM 0 4 lt 9 00 5 BEE TABLE SEE TABLE LAMPS DIM 4 LAMP ENABLE OFF 2 HIGH OFF LCD PANEL 308 0034 LAMPS 4 a DC LAMPS 4 DIM avoc Busse m L L BRIGHT DIM WM equ AMPS BRIGHT 4 3V0C E i OFF 1 2VDC diis MEE dnd UNIT OFF 3 8V0C LAMPS BAIGHT OVDC 2 2K gt SHTING 5 51100 r FD RACKL IGHIINS 1 7104 CR103 Ch105 1 OFF 1 S 1 CR107 CR487 0103 1 L Cr 009 903905 1 4 z 5260 4 x Y ux 3 avoc 19
13. I 6 I 7 18 9 18 a 1 C224 C222 H 10pF 4 pF 2 gt 8163 Lise RL100 1 L 100 L168 2510079 3620112 c226 1 2510079 1 C228 iuF c223 C221 J m Y 180 180 C 22 23 241 25 261 Front Board Schematic 17 0 8211 Note This drawing applies R8 R8E units with revisions and printed circuit board artwork 0 1 0 5HHZ C105 22uF DIOOES INOUCTORS RESISTORS TRANSISTORS LU 4 1 i cess 1175 197 89 vi 45 75 HHz eons J101 1 sur 11 16V0C FIL Kx Parte so 1 1UF ciag O 11 16VDC IN ovnc t 1 09 J100 1 1 FIL 1 gt 5473 dur T c239 411 18VDC FIL 83 T 2510078 E 33o0ur gt Q 1 1 11 1BVOC FIL cR 28 7 sov 169 88 1 344005 E i PRE AMP Non LAS PREAMP ATIN OFF 12 9vDC 130 N 2 2 7V0C A176 114005 PAEAMP o el id REAMP ON 0 6V0C OFF 0V0C 8166 0107 2N3904 0109 2N390
14. MICROPROCESSOR SYNTHESIZER eons D OI SEON OE WR 1 1 1 D 1 t t 1 1 1 1 1 1 D 1 1 1 1 1 1 1 1 1 i 1 1 1 1 1 1 1 4 4 1 1 1 1 1 3 1 L J105 3 5 HHZ REF Bere me Soe canoe oe T VHF CONVERTER 08 TEST JACK P101 P3109 P103 P102 ENCODER WHEEL FUNCTION KEY PAD NUHERIC KEY TO CONVERTER gt IS CONFIDENTIAL AND PROPRIETARY ANO IT IS IET NOT TO BE USED COPIED OR REPRODUCED IN E WHOLE OR IN PART OR DISCLOSED TO OTHERS WITHOUT THE EXPRESSEO WRITTEN PERMISSION OF 1 DRAKE COMPANY THIS GOCUMENT CONTAINS INFORMATION WHICH COPYRIGHT 1991 n L COMPANY FRONT END BOARD THEORY OF OPERATION Incoming signals from the ANT 1 and the converter an tenna receptacles are first routed through the antenna switching circuitry consisting of relay RL103 and RL101 ANT 2 is first routed through a 9 1 impedance matching trans former then to RL103 ANT 1 is selected when both RL101 and RL103 are in the off state When ANT2 is selected by the user via the front panel controls RL103 is energized by Q108 and its associated circuitry When the converter an tenna is selected RL101 is energize
15. T 8 ole elei ol eoi el elol LED mere SYNC ES 7 DRAKE LED Pgh ft fei zm i NOTCH HIPER CH PUR ou 8 p XFAR X ur 1 11 16V06 XN ment E 2 FROM REAR PNL INT aio ar dol BFO IN Q SPKR Kol P N IS 3188238 25V 185 R THIS DOCUMENT CONTAINS INFORMATION HHICH IS CONFIDENTIAL AND PROPRIETARY AND IT IN HOLE OR IN PART OR DISCLOSED TO x TE T Um AUDIO mc RTT E COPYRIGHT 1991 R L DRAKE T H SQUELCH T VOLUME CONT CONTROL HEADSET m JRCK NOTES 1 0162 2N5482 2830288 MAY BE REPLACED WITH 2N5953 3039281 BUT BODY ROTATION WILL BE DIFFERENT SEE CHART AT RIGHT FOR MORE INFORMATION 2 C149 AND C158 MUST BE PARTS AS NOTED ZONE M 14 TOP VIEH 11588 6588 SYNTHESIZER MICROPROCESSOR THEORY OF OPERATION The synthesizer microprocessor board provides several RF signals and all the logic control signals required by other boards in the R8 R8E receiver The RF signals provided by the synth uP board include 1 VCO or Ist LO which is a 45 75 MHz signal to the Ist mixer on the Front End board 2 2nd LO which is a 45 05 MHz signal to the 2nd mixer on ihe Front End board 3 BFO or beat frequency oscillator which is a 50 KHz signal required for SSB reception by the AM detector on the 2nd IF AUDIO POWER SUPPLY board
16. 2 60 0 61 0 MHz SN76514 PLL 3 63 49 63 5 MHz MC145157 1 2 R3 3500 4 900 4 9995 MHZ 5 N3 4900 4999 65 001 66 100 MHZ vco 3 6 5001 6 5100 MHZ L2 IS CONFIDENTIAL ANO PROPRIETARY AND IT IS NOT TO USED COPIED OR REPRODUCED IN WHOLE OR IN PART OR DISCLOSED TO OTHERS WITHOUT THE EXPRESSED WRITTEN PERMISSION OF A L DRAKE COMPANY 1 18 A A COPYRIGHT 1950 A L DRAKE COMPANY 1 84 N THIS DOCUMENT CONTAINS INFORMATION WHICH Synthesizer Circuits Schematic D 8214 415 I 6 7 I 9 aol 111 121 131 141 isl 161 17 181 191 201 211 221 231 251 26 PLL A185 P L L 2 10V 10V 63 49 53 50MH2
17. Caio 297 ATTN ENABLE jo XTTN gt FM ENABLE gt OFF 0 8V0C T Sap on 220p 10 F VRF Ll YHE gt H 11 16VOC IN A107 8106 A 5309 niii ANTE 6 ARTIZARTE gt F 1 4 7 5 03 acc 1 55 lt M ANTi OVOC i BAND ole ANTZ 2 7V0C L102 tios 1100 0 5 i 5HHZ d 2 01 RSSI OUT Do HF AUDIO QUT 270uH LCI VHF 2 7V0C 8179 THIS DOCUMENT CONTAINS INFORMATION WHICH 1 304 C108 100K IS CONFIDENTIAL AND PHOPRIETARY AND IT IS 220pF 1000pF NOT TO GE USED COPIED OR REPRODUCEO IN FILM WHOLE OR IN PART OA OISCLOSED TO OTHERS C104 alo Er SE WITHOUT THE EXPRESSED WAITTEN PERHISSION Auf R101 OF L DRAKE COHPANY 1 C C25 C255 256 c2 4 C250 C249 C248 CAPS 100 4 7K AUF SUE dur sur iuf iur iur COPYAIGHT 19892 A ORAKE COMPANY Lea 18 LD b 3 d 4 14 5 E A 9 10 11 12 13 14 15 16 I2 18 19 20 21 22 23 24 25 D 8135 Note This drawing applies to R8 R8E units with serial S N numbers previous 10 11100000 November 1991 IST L O IN 2 L O IN FM AUDIO FM SIGNAL STRENGTH L178 O EDO GD CED 0
18. gt se 1 10K c209 V 82250 538 1 nia c106 O1uF C231 pn vR102 8 85 N 4148 1 10pF FROM O1uF 781 05 d 1 MICAGPROCESSOR aur gt 1 t SCHEHATIC u T 2 gana 1 t Prawa V C gt neas czas que xov ne 1 1 2euF iuF 8196 C243 c240 O 10V iuF 8463 60 61MM C168 1 1109 4 390 R142 8164 100uF J 5 6uH 107 t 25 2 258 ni92 100 IN rg 28 5 Data 5 2 1 8K 1 caas 08105 152208 290 0117 R128 8 2pF 152186 B 2pF M _ Loop 4 208 Ce 412 casos 350K v68 355 336 1437 2955 10 1MHZ 8365 1 d 1 LL 1 Wen 5 Ss Y n 1 1i 8uH O Lies Laza 2 2K 1 i t 100K E E 5 2 L108 mE tias as 0 Cy S852 0 270 ed C241 5522 6221 iuF FILH 1 152208 8524117 gt gt IL 001 _ seer 8210 7 1 10V 1 1 H 8413 i 8343 Lasa C142 D er T 184128 5 5uH 9109 52 50HHZ 2 8305 1 200485 a sal 1290 Jass gt BFO DIGITAL MIXER OtfuF Ch126 gt 1 172 1 8 30 8 2pF 1 1156 B
19. 90 DEG 90 DEG PC 90 DEG CONN COAX PC MT 90 DEG TERM STP 3 CKT COIL RADIAL 1 0 MH COIL RADIAL 150 0 UH COIL RADIAL 270 0 UH COIL RADIAL 150 0 UH COIL RADIAL 1 0 MH COIL RADIAL 270 0 UH COIL RADIAL 68 0 UH _ COIL RADIAL 82 0 UH COIL RADIAL 68 0 UH COIL RADIAL 270 0 UH COIL AXIAL 1 1 UH COIL VAR SHLD COIL RADIAL 82 0 UH COIL RADIAL 56 0 UH COIL RADIAL 22 0 UH COIL RADIAL 56 0 UH COIL RADIAL 82 0 UH COIL RADIAL 56 0 UH COIL RADIAL 33 0 UH COIL RADIAL 15 0 UH COIL RADIAL 33 0 UH COIL RADIAL 56 0 UH COIL RADIAL 27 0 UH COIL RADIAL 18 0 UH COIL RADIAL 8 2 UH COIL RADIAL 18 0 UH COIL RADIAL 27 0 UH COIL RADIAL 5 6 UH INDUCTOR TOROID COIL RADIAL 5 6 UH COIL RADIAL 10 0 UH COIL RADIAL 15 0 UH COIL RADIAL 3 3 UH COIL RADIAL 15 0 UH COIL RADIAL 10 0 UH INDUCTOR TOROID COIL RADIAL 4 7 UH INDUCTOR TOROID 3501056 SHIELD COIL RADIAL 6 8 UH COIL RADIAL 10 0 UH COIL RADIAL 2 2 UH COIL RADIAL 10 0 UH COIL RADIAL 6 8 UH INDUCTOR TOROID INDUCTOR TOROID REF L148 L149 L150 151 1152 L153 L154 L155 L156 L157 L158 L159 L160 161 L162 L163 L164 L165 L166 L167 L168 L169 L170 L171 1172 173 174 175 176 MI M2 M3 P100 P101 P102 P103 P104 P105 P106 P107 Q100 Q102 Q103 Q104 Q105 Q106 Q107 Q108 Q109 R101 R102 R103 R104 R105 R106 PART NUM 3524136 3524136 3524165 3524165 3524165
20. cR133 1N4148 A371 FROM J108 10K PIN 7 203904 0150 4988 maso 7 BLANKING 503904 10K E iur THRESH AUDIO ADJ FROM C351 0022 L 024V Es 9155 35K81 R215 R216 10K 10K C310 e20pF ae Sy d 13 14 15 161 17 11 12 18 19 Tis 20 craze A G C 1N414B casa 0022 104148 CRi22 HF GAIN I T 28804 So 9161 SIGNAL 2N4125 STRENGTH 4 7K 9134 5v CR120 n282 2N4125 40K m Er CE 0129 10V0 203904 5 FROM J106 PIN 7 HIGH FAST AGC 9543 243904 R324 325 oiur C324 1M4148 CR137 C357 A378 400K TO 0113 PIN 4 2 2uF R222 1M C 93 1M4148 0022 care 5 10V R201 A200 O 40V C197 10 iour 9 A224 330K TO AGC 107 8245 c200 uF C128 002CVIL I 225 C359 11 221 231 241 25
21. 28 Synthesizer Block Diagram 41 Synthesizer Circuits Schematic 43 Synthesizer Microprocessor Board Pictorial 44 Microprocessor Block Diagram 47 Microprocessor Circuits Schematic 48 Keyboard Switch Matrix Diagram 52 Front Panel Board Schematic 53 Front Panel Board Pictorial 54 VHF Converter Board Schematic 73 VHF Converter Board Pictorial 74 USING THE R8 R8E SERVICE MANUAL This manual is divided into several sections for clarity and ease ofuse Each major section is written with the assump tion that the preceeding portions of the manual have been read and understood by the user Section 1 is introductory in nature and provides a general discussion of operating theory and module location Section 2 contains complete information on each func tional element of the R8 R8E This information includes de tailed circuit description parts list component location and schematic diagram This section of the manual is divided by major functional element such as circuit board module chassis etc for the purpose of rapid circuit component and problem identification Section 3 is a complete alignment procedure for the R8 R8E and includes test equipment requirements recom mendations and test point locations Section 4 includ
22. REEERE 500 88 0 Y gm er x E a u LSD ro sere 1 111 500 5 a 9 FULL i e gr SCALE B 55 _ 0000 ME A7 2 Ts 4 we 5 4413 fe o 00000 E RO 09 8 E gt LC C 5 pooggeng 0 00 1 58 aut i ji ig tg 6 99 0 C9999 9 020002999 PELELELEEE BE 16 dla Eas 0090 00000 VIVIVIIIVIVI CI 81 Q O H TT 90090 7 893357595 I 6 d OIN oT TO RF iat i Gwen spg CAIN 54 ran 00000 577 VU UI asp mi E CONT S 2000000 24244444 A S OUO rp OM UPON 28 sisi i 000 10 CD 9000090 AE O 0 4 Ss a 1 eS 52 COTES In E K Uo 5 dey feta EE 52 5 5 Qe IL II 5 Je k kd UE eT gt 2 6 Qui 2 28 lt 000009 000 00DODDOOOOOOC KEC HO y pog TUR uid HERE ELE 6 16 9 1 Ep 8529 U dle 1391 FeLUGECLCL M SERE L R L DRRKE Co
23. Sy Read Cage d S j god 0 025 C 3 an Ds as OD og ORB Ed es So 023 20 mm 6314 ao k oooeoooon cs 28 180 9247 wo SENE ogaao oa 8 xs O DRAKE OSO Ey 9 1 0 yes e zo O F292 CI 023205 CONE 8 OR BOS A 145 Resd A Rest 828 osseo O p uch Ei 9998 520 95 6 650901 ES 5 E ot EK y of og E En EOP 079 ecu bane HO 6 08 gt 0000 0000000 gt VI29 ES Oia 02 St 506314 se gout ux e p 0000000 123 6234 12 C32 Bi O oO 09 5 0 R203 uses deu O d erm O 80000000 ZO Ei aO 4 09900000 428 kem er Qoa roin 9 60 ze q yer Gue3 C158 ET Dx t F238 O E asa 0 Oz 179 OcsttaO R208 200 dans 296 gt AS 28 Q to 000000 petu g cr OMX 0128 Zrz s CV 0000000 R287 228 59 330 Que
24. ices ae O G La ora Pa 1 525 SHIELD COVER 9 0 5 H 9 eum CI34 AO o QR emo saa 112X 122 1 2254 ga CRIBS 152106 026 qs oOo FO Sl Suis 92 cla Om K Usa cue 0545140 22 69 oc 228 E 3 1 OO OO ONO RR ae O i 136 07 06 O ANT 1 IN a A PO 0 O 3 c O Dy O ase nose yy v cias wu E 7 R176 o CORY IN H 9 D E GEN GERN QoS eno Qaa Uu CI49 Ye you ere 3 2 M RIBI 108 320723 JOQ CI25 Oz s o o rai sid O 2299725 pis C OO Quee ORO 8 ES a cies ee 8 us oU OO DE Ep 59107930 cr 18 Og Oo Oa BO O MO sso LC C ee 0 amp uLI O gal Q ORE N CRIES wi 1 52166 CRIES 192186 CRISI 152196 6 575 4 Ce38 4 ATTEN ENABLE gt ORM 4x O m Onde o med 4 2 om Lapis 9 9 9 0500 3 O RIS ex RISS 4 7K ga 5 03 ne SrHz 8 5 1 5 1 9 2 5 2 5 4 0HHz 4 8 2 5tHz 10 5 15MHz 15 22MHz 22 30MHz 9 i THIS DOCUMENT CONTAINS INFORMATION WHICH IS CONFIDENTIAL AND PROPRIETARY AND IT IS NOT TO BE USED
25. 10K 5 1 4W RES 1 0 K 5 1 4W RES C FILM 2 2 K 5 1 4W RES C FILM 2 2 K 596 1 4W RES M FILM 10 0K 1 1 4 W RES M FILM 4 99K 1 1 4 W RES M FILM 2 49K 1 1 4 W PART NUM 3260664 3220275 3220315 3220235 3220335 3220285 3220285 3220315 3260664 3220235 3220235 3220260 3220320 3220235 3220285 3220235 3220110 3220110 3220210 3220210 3220210 3220210 3220210 3220315 3220315 3220245 3220315 3220275 3220285 3220235 3220315 3220235 _ 3220285 3220230 3220210 3220215 3220235 3220235 3220260 3220320 3220235 3220235 3220235 3220160 3220315 3220315 3220315 3220315 3220110 3220315 3220315 3220345 3220345 3220345 3220345 3220345 3220345 3220075 3220075 3220075 DESCRIPTION RES VAR 10K RES C FILM 33 5 1 4W RES C FILM 100 K 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 270 K 5 1 4W RES C FILM 47 K 5 1 4W RES C FILM 47 K 5 1 4W RES C FILM 100 K 596 1 4W RES VAR PTIOV 10K RES C FILM 10K 5 1 4W RES C FILM 10K 5 1 4W RES 22 5 1 4W RES C FILM 150 K 5 1 4W RES C FILM 5 1 4W RES C FILM 47 K 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 470 OHM 5 1 4W RES C FILM 470 OHM 5 1 4W RES C FILM 4 7 K 5 1 4W RES C FILM 4 7 K 5 1 4W RES C FILM 4 7 K 5 1 4W RES C FILM 4 7 K 5 1 4W RES C FILM 4 7 5 1 4W RES C FILM 100 K 596 1 4W RES C FILM 100 K 5 1 4W RES 15K 5 1 4W RES C FILM 100 K 596 1 4W RES C FILM 33 K 596 1 4W RES C FILM 47 K 5
26. 246 ATTN 4700pF OFF Y BANDPASS FILTERS C214 1460 4 cAi26 CR125 C8123 899 3 L149 cis3 P104 i voc voc e _ 150pF 6962 440 C193 ewe 8 2p 0104 2510022 1000pF Lsa2 gt 54 CU ae Biek rea 3524419 X6401 xr100 3524119 Et C241 5 c154 ecd jud B i 1 L our 4 7K 1 1 BAND 9 P102 131 844 C 79 M s di 3 1 l 6155 22 i 4 20pF T C164 462 sour 3 9pp 2140126 C8120 CHIP a cass E 1000pF 22 1 o 4 70H 2510082 10 1 175 P103 lo 1150 4 7K S SEE NOT 1 1 82 C 9 5 6uH 0 4 0 TA T C158 Aidi s 5 8 0022uF 120 6177 nis iL 1000 C 27 10V R154 Soon 470K 22uF l 15 22MHZ T 45 MHZ IF SECTION 85 Ui102 PINS 4 7 8 10 16 9 8VOC WHEN SELECTED c152 1000pF E 0 4VDC WHEN NOT SELECTED 1N414B C8442 107 ca117 1102 PINS 12 15 152186 4 9V0C 08 146 DEPENDENT ON BAND 4 7 BAND 7 i 10 5 15MHZ C486 40 22uF 1 ua FM DETECTOR 10V casa 81 39 10 320pF 115 4 7K
27. DESCRIPTION 2510100 2510100 2510087 2510087 2510087 2510087 2510093 2510093 2510093 2510093 3040169 3045012 3040018 3040016 3040018 3040169 3024701 3024701 3024701 3024701 3020050 3020335 3020335 3020335 3020335 3020088 3020050 3020050 3020050 3024700 3024700 3024700 3024700 3020335 3020335 3020335 3020335 3020335 3020335 3020335 3020335 3045009 322 1066 304003 1 3040031 INDUCTOR TOROID INDUCTOR TOROID INDUCTOR TOROID INDUCTOR TOROID INDUCTOR TOROID INDUCTOR TOROID INDUCTOR TOROID INDUCTOR TOROID INDUCTOR TOROID INDUCTOR TOROID LC LPC662AIN IC MB1504 LC 74HC595N 74HC14 IC 74HC595N LC LPC662AIN VARACTOR 15V153 VARACTOR 15 153 VARACTOR 15 153 VARACTOR 15 153 DIODE 1N751A 5 1V 5 5W DIODE 192186 DIODE 152186 DIODE 152186 DIODE 182186 DIODE 1N4099 6 8V 5 25W DIODE 1N751A 5 1V 5 5W DIODE 1N751A 5 1V 5 5VV DIODE 1N751A 5 1V 5 5VV VARACTOR 1522088 VARACTOR 1522088 VARACTOR 1522088 VARACTOR 1522088 DIODE 152186 DIODE 152186 DIODE 152186 DIODE 152186 DIODE 152186 DIODE 152186 DIODE 182186 DIODE 152186 IC BALANCED MOD DBM50A RES PACK BLA8 154F R2R 8 I 78LO5 ACP 78LOS ACP m z Tome 24 EN SEE gt U D
28. 45 Radio Controls 45 Front amp RearPanell O Theory of Operation 49 Alignment 55 I Power Supply Voltage Checks and Setting Clock Timer 57 Setting for Oscillator Clock Timer 57 Synthesizer and PBT Alignment Test 57 35 MHz Reference Oscillator 57 PBT Adjustments 57 PLL Loop 3 Adjustments 57 PLL Loop 2 Adjustments 58 PLL Loop 1 Adjustments 58 50 KHz BFO Checks 58 Front End Board Alignment and Test 59 Check of Front End Bandpass Filters 59 Antenna Switching Checks 59 45 MHz IF Section Alignment amp Tests 59 Image Reject Mixer Section Alignment amp Tests 60 FM Detector Alignment Checks 60 FM Squelch Adjustment 60 IV Second IF Audio Board Tune Up and Test 61 50 KHz IF Filter Tune Up 61 A G C and S Meter Setup 6 SSB AM Squelch Set
29. ANTE Z HANTIZARTZ gt 411 56V06 IN II gt ANTi ANTE 2 7V0C GNI ASSI OUT HF OVOC FM AUGIO OUT THIS DOCUMENT CONTAINS INFORMATION WHICH 2 7V0C IS CONFIDENTIAL ANO PROPRIETARY ANO IT IS 4 DIODES INDUCTORS RESISTORS TRANSISTORS FI ca na Qn un u COPYRIGHT L DRAKE COMPANY 1 e Au qi EE I gt 1 ANT 2 500 3301253 1 Li 1 1 CONV 1 50 1 1 r 1 14 16YDC FIL T H FIL C8129 182683 1 ANT1 0V0C ANTZ 2 700 176 Y OHM HF ovoc 2 7v00 y 20 21 22 23 24 25 26 NOTES 1 NODE VOLTAGES HEASURED WITH RF GAIN TURNED FULL CH AND NO INPUT SIGNAL 141 15 16 17 49 D 8211 serial S N numbers affer 11100001 355555225224 s November 1991 RL100 t E 3620112 1164 1 97uH c223 lt C221 zT 180pF c209 gt 15 18Y0C FIL Lia 1200F C247 E s C239 I 2818078 50v T lt lt Das 1N4005 PHE AMP un Qm 13 6VDC PREAHP ATTN OFF 12 9V0C PREAMP ON 6V0C OFF 0 0V PREAMP ON 0 6V0C OFF 81688 40K
30. USED COPIED OR REPRODUCED IN WHOLE OR IN PART OR DISCLOSED TO OTHERS WITHOUT THE EXPRESSED WRITTEN PERMISSION OF THE R L DRAKE COMPANY COPYRIGHT 1931 L DRAKE Co ATAN ansa J Front Board Pictorial 18 D 8135 1 2 3 4 5 6 I I 8 i 9 18 11 12 14 15 16 12 18 19 28 21 23 24 25 Note This drawing applies to R8 R8E units with serial S N numbers after 111000001 November 1991 IST L 0 IN 2ND L O IN 1159 8 Cre FL108 Lie C152 1808 2285287 FH AUDIO C i O cb 69 SIGNAL STRENGTH fs ORG cise Dog 9 Ofer OE ree 1 142 996 SS gt o CN FH DET ENABLE 8 bd QR o o Gis CH6 ane O ES nn 320525 R132 E C one 16550 2 m o dc a a MC Ex L S8KH2 GEA LIO us abt X 4 RI83 22K i 0 231 R134 agg oc On eO 161 1 90 0 Cui on oue Sis 10 08 Q OO c Pig 30 x 4 use R142 4 i was 1 Rias 27 ster Orphise 0 J gu CFI SEG
31. gt ALL NPN S 2N3804 470 1N4005 3 32 0106 N T 40 SUPPLIES A292 0 OHM p HPSA13 2909 L FILTER EE Drei oe caen 22K cas 8256 FROM J106 NOTED ud nasa L ae ALL NPN S 203904 PIN 4 2 2 CAPS IN PICOFARADS 9 IN FILTER SECTION A235 TO DETECTOR 8311 0143 r 22k A298 55K 89 sa Tina 2 O I al NAK eaaa t Sees sees 2 iuf 8243 9146 9144 c eax gt C251 SEK 11 D 16V0 104 casa E 33 1 R234 Auf 8297 My MI 7 caso 7 SPDT REL NC 15 L 8295 IL sur 8259 c250 8345 2 2K 9145 X ji 1 5 22K nd J106 C347 FROM Sr FROM 2107 9442 M05 53 NS 10v gt FROM 107 3V t 8352 C343 OvnC Y 102 m 7 6 V300 353 y 0183 6103 A104 105 243904 3 33K 5V0C LINE A348 SOKHZ 835 AUDIO N ovpc dioi SOKHZ 45V0 C294 C104 SYNCHRONOUS PU qu f TONE T NOTCH A155 4 5V 400KHZ TONE 047uF 0022uF E 8157 0132 Bor 813 2N4402 SEE NATE 4 C157 R154 2 5vDt 424 4BVpp 2 2K 2 10v Svo r Q 1 c 2a 127 C149
32. 22uF 2N3904 5V GENERATOR 2nd IF Audio Power Supply 28 Board Pictorial D 7974 E 2 4 5 6 2 8 9 11 12 13 14 15 16 12 18 19 28 21 22 23 24 25 Note This drawing applies to R8 R8E units with serial S N numbers previous to 1 100000 1991 LINE LINE EXT 1 gg 59 KHZ IN BLANKING AUDIO AUDIO SPKR B FROM MIXER THRES BR BR BET d 3 I RGC2 SET zg 8 5166 I tah Rages Sees J Sp UH 0000 m 1 e JA NN 8 mm D d Tu B i 4 5 H I He ith 52 95 WO i SCALE 2 ai 7 WA TO FRONT a e Ly PANEL OX L mmc 2 5 HETER i xir CONT J well 5 5 lt Q X SOD cera etn 91515 QE ore rame 1 1 t Y 1 tt Y Y 5 3 9 559 DONT 2252227 un more SYNC CONT FROM REAR PNL INT amo BFO IN Q SPKR 29 CIC 24 P N 15 3188239 Ey V E RoE A ter zs Zus 8151811 181818181815 ele 2951512 amp ele E THIS DOCUMENT CONTAINS INFORMATION WHICH un 15 CONFIDENTIAL AND
33. UM CM60 6 SEO D SHO qr E Dos Soe O IE 3r e MM 5 0 OHO road e Deb 050 o OUO 9 OW O Quo SEO I 2 oo 3 OUO 6 Cy P Pm a THIS DOCUMENT CONTAINS INFORMATION WHICH IS CONFIOENTIAL AND PROPRIETARY ANO IT IS NOT TO BE USED 08 REPRODUCED WHOLE OR IN PART OR DISCLOSED TO OTHERS WITHOUT THE EXPRESSEO WRITTEN PERHISSION OF THE L DRAKE COMPANY COPYRIGHT 1990 8 L DRAKE CO VHF CONVERTER ALIGNMENT VCO Test and Tune 1 Set the R8 R8E to the frequency listed in Table 1 2 Probe pin 1 of U101A with a DVM set to measure voltage 3 For VCO1 and VCO2 adjustment is not necessary however the voltage should be checked to assure that the loop is in lock 4 VCO3 and VCO4 should be adjusted at the high end of their tuning range then checked at the lower end for proper control voltage 5 Proceed with tuning per Table 1 R8 RBE VOM READING EXECUTE STEPS IM THIS ACTION FREQUENCY MHz VERROR ORDER REQUIRED VCO I 45 40 20 1 Check voltage af pin 1 VCO2 115 4 0 2 0V 2 Check voltage at pin 1 VCO3 145 8 0 0 1 V 3 Tune L103 for desired voltage at pin 1 4 132 2 5 0 5V 4 Check voltage at pin 1 VCO 5 168 8 2 01 5 Tune L104 for desired vol
34. CAP 047 MF 80 20 250 ELECTRO 10950 20 CAP RADIAL 220 PF 5 N470 CAP FILM 015 6 100V 5 CAP ELECTRO 10050 20 CAP FILM 2 2 6 100V 10 CAP ELECTRO 6800025 CAP ELECTRO 6800925 RAD L CAP AX 10 MF 50V CAP ELECTRO 2 2050 CAP ELECTRO 2 2050 CAPELECTRO 10950 20 CAP RAD 0033MF 295 NPO CAP AXIAL 0033MF 20 YSR CAPELECTRO 10950 20 CAP ELECTRO 100950 CAP AX 10 MF 50V CAPELECTRO 10050 20 REF C155 C156 C157 C158 C159 C160 C161 C162 C163 C164 C165 C166 C168 C169 C170 C171 C172 C173 C174 C175 C176 C177 C178 C179 C180 C181 C182 C183 C184 C185 C186 C187 C188 C189 C190 C191 C193 C194 C195 C196 C197 C198 C199 C200 C201 C202 C203 C204 C205 C206 C207 C208 C209 C210 C211 C212 C213 C214 PART NUM 3184019 3180064 3151648 3150690 3151405 3150690 3151405 3151648 3151050 3151405 3151405 3151364 3151064 3150420 3150783 3150750 3150420 3150420 3150540 3150779 3150640 3151405 3151425 3151648 3180018 3184019 3180109 3180109 3180152 3151648 3180018 3151050 3151405 3151405 3151364 3151260 3151425 3151260 3151155 3180018 3180064 3150245 3151260 3180018 3180241 3180109 3180109 3180018 3180064 3150245 3150640 3150779 3150540 3150420 3150420 3150750 3150783 3151064 DESCRIPTION CAP FILM 001 100V 5 CAP ELECTRO 10050 20 CAP AX 10 MF 50V CAP AXIAL 33 0 PF 5 NPO CAP AXIAL 001 MF 1096 Y5P CAP AXIAL 33 0 PF 5 NPO CAP A
35. P194 e 0 GER 623 6 O 1510 25241647 NOTES 1 0N COMP SIDE SOLDER COAX P N 271 5645 BETHEEN POINTS A AND 0 SOLDER COAX P N 271 5643 BETWEEN POINTS B AND SOLDER SHIELDS OF CORX TO GND RT TERMINATION POINT 2 SOLDER METAL SHIELDS TO COMP GND PLANE ALONG ENTIRE SEAM 3 C163 AND C176 PRE luF FILM P N 318 4068 REAL TIME CLOCK GND SW ENCODE ENCODE A SW SW R4 SW RS SW CI Sw SW S4 C4 CS LA gt Dr KETUTND end LO FREQ TEN ADJUST FREQ ADJUST LEVEL ADJUST 5 d 425324 DISPLAY BORRD RSSY Synthesizer Microprocessor 44 Board Pictorial D 8137 Note This drawing applies to R8 R8E units with Revision C printed on circuit board artwork THIS DOCUMENT CONTAINS INFORMATION WHICH IS CONFIDENTIAL AND PROPRIETARY AND IT IS NOT TO BE USED COPIED OR REPRODUCED IN WHOLE OR IN PART OR DISCLOSED TO OTHERS WITHOUT THE EXPRESSED ARITTEN PERMISSION OF THE R L DRAKE COMPANY COPYRIGHT 0199 Co DIGITAL SECTION THEORY OF OPERATION 1 Microprocessor and Memory 2 Radio Controls 3 Front and Rear Panel Theory of Operation 1 Microprocessor and Memory The R8 R8E is controlled by an 8049 microcontroller 0104 executing software storedin a 27256 32k EPROM U 106 The address range of the con
36. RES 470 OHM 5 1 4W RES C FILM 10 K 5 1 4W RES C FILM 820 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 4 7 K 5 1 4W RES C FILM 100 OHM 5261 4W RES C FILM 2 2 K 596 1 4W RES 8 2 5 1 4W RES 10 OHM 5 1 4W RES 33 OHM 5 1 4W RES C FILM 3 3 OHM 5 1 4W RES C FILM 3 3 OHM 5 1 4W RES 33 OHM 5 1 4W RES C FILM 10 OHM 5 1 4W RES 8 2 5 1 4W RES C FILM 2 2 5 1 4W RES C FILM 68 OHM 5 1 4W RES 22 OHM 5 1 4W RES C FILM 68 OHM 5 1 4W NO PART RES C FILM 100 OHM 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 5 6 K 5 1 4W RES 1 8 5 1 4W RES C FILM 47 OHM 5 1 4W RES C FILM 270 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 6 8 5 1 4W RES 10K 5 1 4W RES C FILM 220 OHM 5 1 4W RES 10K 5 1 4W RES 2 2 5 1 4W RES 6 8 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 100 OHM 5 1 4W RES 2 7 5 1 4W PART NUM 3220160 3220075 3220015 3220055 3220015 3220160 3220190 3220230 3220055 3220235 3220190 3220055 3220055 3220235 3220005 3220055 3220085 3220210 3220075 3220210 3220075 3220115 3220075 3220210 gt 3220210 3220315 3220315 3220210 3220055 3220235 3220315 3220315 3220235 3220285 3220260 3220160 3220110 3220190 3220285 3220315 3220285 3220210 3220285 3220315 3220255 3220200 3220330 3220210 3220110 3220100 3250468 3250463 3250496 3250491 3250486 3220235 3220160 3220190 3220190 3250425
37. THIS DOCUMENT CONTAINS INFORMATION HHICH IS CONFIDENTIAL AND PROPRIETARY AND IT T PANEL 5 TO RF GRIN CONT 111331 TO FRONT SCALE FO IN 588 SORDO THRESHOLD SET 3296745 1106 3288744 J187 0 o gas uo REN 537 5 4 nde C O O o Fra ules 799074 o AUDIO GRIN 85 EE d eue AMNES 6 Mace eret HIPER 56666 gt D On aO O tree POTES One aO SQUELCH 132 TN a O SES re CED SEED 035555 ES Se 10 0100 gt 5 JOO 0000 20 Pia N p D Over em En OF isoO On sn Ome nao donora an Qu um ey 6 i 5500730 1981 DRAKE Co PN IS 3188239 25V 185 C Es 83 0000000 Q a sa EXT 11 16VDC IN FROM REAR PNL E pre 2948 16 PHR XFAR P N 3628643 MOTOROLA ONLY ms Kori 9 88 MG 6886 co ES 8 E 00 d 2 74 5 8 28 55 Gu mau man 1 1 DEL Sur u c dee i I uu wit amp i And a i
38. f 8439 10 120pF 4 7K Auf I 6105 _ BAND 6 gt 1325 147 J 10V S8L 1x 22K EX M 47 1123 E 7 5 10 5MM7 9 346 1156 R103 CY 2510083 2510083 4 22M 1BuH 22uF 19 gt C117 50 kHz OiuF 8154 A129 ON 3 4V0C T 58 laze 4 7K c so OFF 0 1V0C 2 2006 set 308 A127 3524119 H 1 4 0 7 5MHZ 1157 ER 9100 2510083 2510083 Cy 203904 10 245MHZ oj 9 6 6 2 5 6 Fm CR106 9140 194 113 1 3140405 47 10 120pF T00K c so 100 22uF 7418145 3140403 c219 C136 8162 1000 J102 4 3 1 8 8V0C aer oa 2 15 1 go OFF 0 2v0c iur cias 0310F t A117 R E 126 45 05 MHz ei a IMAGE REJECT s ce us si 1 dur MIXER SECTION 2 5 4 0MHZ H A123 41 ur Y 1 Wiese wake a i 5 0 8182 OFF 2 0 0 107 100K FH ON 10 245HHz ON caso 0 28Vpp 34 3MHz Siur 4 1VDC 0 B4Vpp 8220 al 4 7K FM OFF OVAC P gt ovoc BAND 3 FM ON 9 BUDE 0 01Vpp EEUU ATTN ON 2 7VDC Pa C111 10g 106 C108 P ROS 6353 vo OFF B PREAMP ON 2 BVOC PAA Pr peame 56 y Pig OFF K c FH ON 0 25V0C i o ENABLE gt FM QM L 9V9C 9 01vpp
39. o p wm Bo 833ul 8 looo Be Ac za 6 san 6 0 0 i FM DET ENRBLE 2 C128 9 lur 5 2 R121 L128 B ADMIS 1000 1680H po G OO zs nae cs LI72 6 3280720 Oi 9 C129 8 1u g 1 Ly eo O 1 za s criga 5 O O ZG 155 Blur E f 3140403 9 IVC alu eisi 6855 6 i lo OLLA os 3205228 922 c235 C243 MIA 2106 l 27 RI32 188 EL d SEO O O Q 21 0O C aids I 158 C234 3280042C 244 IX gt 2 OO AS Tale cO oe Ol 8 derr D fpe 9102 nn vd 5 KRZ G 101 R133 COVER ecu GY ar 90010 50 i our 45 1 cH O 2519103 leur i Ll LOO o d Cp m ME 39058 C236 Y gres 5 0150 IC 50 5 Oris C2 i co T vue TONES 299 20 gt 4 2 xO um 3 FO ER C19 158 om IST RI48 47 5 4 av ise Sen gt ore gm 007 2 plv _ 3260612 3581855 o P 3205007 lt gt 4560276 SHIELD COVER H Y Seek ora d 3493040 d T E
40. 01uF T 45 GAIN 2 gt lt od 1 1 1 1 A t 1 1 1 1 1 1 1 1 t t I U104 F 74Hc14 LCC6652 M 1 1 1 1 1 1 1 1 1 1 1 1 i i 1 D 1 r 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 4 1 t 1 1 1 1 1 1 1 1 4 t 4 1 1 1 D 1 1 t 1 1 1 1 1 1 1 i 7A 3 p a 1 5 I amp 7 8 9 4 44 42 13 14 15 46 17 48 19 20 21 22 23 24 25 Pictorial D 8195 ere crits _ i103 oro gro oooO Gau oto D A122 dad uta E 9906 Mo 030070 SAO go don VO 0000 ORO m cuo a BOM FO OO i O OQs DOSO 00000000 00000000 00000000 10 u103 U104 0105 ie 0090000 7000000 OO cu 4 EU ait PFO GED 1000000000 ES GRO y 577 ORO og ares odo 0000 OO im 8 Fo e eos USO O amp O 5 Ef OMi ES DOOO OXO KM N fi os n RUN OOOO Gast Sito OOo
41. 10K 5 1 4W 5 1 4W RES C FILM 1 0 MEG 5 1 4W RES C FILM 4 7 K 5 1 4W RES C FILM RES RES C FILM RES RES C FILM RES C FILM 10 MEG 10 1 4W RES RES C FILM RES C FILM RES RES C FILM RES C FILM RES RES C FILM RES RES C FILM RES C FILM RES RES C FILM RES C FILM RES C FILM 10 MEG 10 1 4W RES C FILM RES C FILM RES C FILM RES RES C FILM RES C FILM RES 5 1 4W 10K 5 1 4W 33K 5 1 4W 5 1 4W 5 1 4W 22 5 1 4W 22K 5 1 4W 22 K 5 1 4W 22K 5 1 4W 10K 5 1 4W 22K 5 1 4W 33K 5 1 4W 33 K 5 1 4W 22K 5 1 4W 5 1 4W 33 5 1 4W 22K 5 1 4W 5 1 4W 5 1 4W 22K 5 1 4W 22 K 5 1 4W 22K 5 1 4W 22K 596 1 4W 15 K 5 1 4W 33 K 5 1 4W 18K 5 1 4W RES C FILM 330 K 5 1 4W RES C FILM 1 0K 5 1 4W RES C FILM 10K 5 1 4W RES 10K 5 1 4W RES C FILM 330 OHM 5 1 4W RES VAR 10K RES C FILM 100 K 5 1 4W RES C FILM 100 K 5 1 4W RES C FILM 33K 596 1 4W RES C FILM 100 K 596 1 4W RES C FILM 10K 5 1 4W RES C FILM 10 MEG 10 1 4W RES C FILM 22 5 1 4W RES C FILM 22 K 596 1 4W RES 22 5 1 4W RES C FILM 22K 5 1 4W RES C FILM 33K 5 1 4W RES C FILM 15 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 56 K 596 1 4W RES C FILM 3 3 MEG 5 1 4W R303 R304 R305 R306 R307 R308 R309 R310 R311 R312 R313 R314 R315 R316 R317 R31
42. 2715645 2715643 3120003 3120285 3120288 3120292 DESCRIPTION RES PACK 11X10K 12 SIP RES PACK 11X10K 12 SIP RES PACK 11 12 PIN SIP RES PACK 11X10K 12 PIN SIP RES PACK 11X10K 12 SIP I C 74HC74 I C IC 3302P 5450 LC 8049 LC 74HC573 L C 27256 EPROM W R8 VERSION 12 SOFTWARE SOCKET 28 PIN L C 74HC 174 I C TC8521AP MB87086 PLL IIC LM358 IC 74HC 139 LC 74HC 174 I C 74HC244 1 C 74HC273 I C KM28C 16 1 C 76514N TL A442CN 1 C 76514N TL A42CN IC 145407 P I C TCF 6000 I C TCF 6000 LC 76514N TL A42CN IC MB467 1 10 IC MB467 1 10 IC LF353N LC 145157 PLL IC 145157 PLL LC LF353N I C 76514N TL 442CN IC 76514N TL 442CN LC MB467 1 10 LC 74F163 L C 74286 1 C 78LOS ACP IC 78LO5 ACP I C 78LO5 ACP COAX 178 7 75 3 16X1 8X3 16 COAX 178 6 0 3 16X1 8X3 16 RESONATOR CRYSTAL 6 0 MHZ CRYSTAL 32 768 KHZ CRYSTAL 22 525 MHZ CRYSTAL 35 00 MHZ Synthesizer Block Diagram 4 D 8241 45 1 75 0 MHz PLL 1 MB87086 100 2 4 34 MHz 81 350 Ni 41 340 41 0 44 4 MHz SN76814 8 0 8 1 MHz 35MHZ 1 PLL 2 148167 10 KHZ R2 380 N2 230 349
43. 3180012 3151582 3280723 3280723 3280719 3030121 3030104 3030104 3030104 3030104 3030104 3220235 3220235 3220315 3220260 3220110 3220170 3220170 3220170 3220315 3250109 3220325 3220140 3220170 3220190 3220315 3220315 3220210 3220210 3220075 3220315 3220210 3040155 3472065 3472065 3472064 3040102 DESCRIPTION CAP AX 10 MF 50V CAP AX 10 MF 50V CAP AX 10 MF 50V CAP AX 10 MF 50V CAP ELECTRO 1 50 20 CAP AXIAL 022 MF 30 CONN P C 3 PIN MALE CONN P C 3 PIN MALE CONN P C 12 PIN MALE TRANSISTOR 2N4402 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 RES C FILM 10 K 596 1 4W RES C FILM 10 K 5 1 4W RES C FILM 100 5 1 4W RES C FILM 22 5 1 4W RES C FILM 470 OHM 596 1 4W RES C FILM 1 2 K5 1 4W RES C FILM 1 2 5 1 4W RES C FILM 1 2 K 5 1 4W RES C FILM 100 K 5 1 4W RES W W 8 0 OHM 10 SW RES C FILM 180 K 5 1 4W RES C FILM 680 OHM 5 1 4W RES 1 2 K 5 1 4W RES 2 2 5 1 4W RES C FILM 100 K 5 1 4W RES C FILM 100 K 5 1 4W RES C FILM 4 7 K 5 1 4W RES C FILM 4 7 K 5 1 4W RES C FILM 220 OHM 5 1 4W RES C FILM 100 K 5 1 4W RES C FILM 4 7 K 5 1 4W UPD7225 GREEN L E D LITE ON LTL 4231 001 or equivalent GREEN L E D LITE ON LTL 4231 001 REDLE D LITE ON LTL 4231 or equivalent IC LM317T 18 KEYPAD SCHEMATIC ART Dr 7927 152 te MA
44. 4 VHF REF which is a 3 5 MHz reference signal to the PLL on the optional VHF converter board Logic control signals required by other boards include D Serial clock and data to the front panel display driver 2 Front panel keyboard scanning 3 Serial clock and data to optional VHF converter 4 Latched steady state control voltages to 2nd IF AUDIO POWER SUPPLY board for bandwidth selection AGC ON OFF and SLOW FAST Notch ON OFF Power ON OFF etc 5 Latched steady state control voltages to Front End board for BPF selection preamp atten enable ant 1 2 converter Let s discuss the circuits involved with generating the 4 RF signals beginning with the Tst LO Note that for most of the discussion that follows the circuitry is located on the SYN THESIZER CIRCUITS schematic Ist LO The VCO output or Ist LO is generated or synthesized by 3 nested phase locked loops PLL S producingsan injection signal that tunes from 45 1 MHz to 75 0 MHz in 10 Hz steps This provides HF band reception from 100 KHz to 30 MHz in 10 Hz steps with the 1st IF frequency at 45 0 MHz Four distinct circuits are used to generate the 1st LO 1 Reference oscillator 2 PLL3 3 PLL2 4 PLL Before discussing the specifics of these individual circuits abrief overview of how the PLL circuits are interconnected is in order The PLL s are nested such that the inner most loop PLL3 provides a reference signal to the middle loop PLL2 and
45. Be careful to align the RED conductor on Pin 1 of the synthesizer board assembly connector header Position the cable assembly so that it routes as shown Re duce any excess slack cable length near the VHF converter to provide the proper routing on its ap proach to the synthesizer board connector header 2707293 ROUTE REF THIS END TO VHF 6 CONDUCTOR OUT CONVERTER CABLE SYNTHESIZER BOARD SHIELDS THIS END TO VHF 3711168 FRONT CONVERTER 26 CABLE PANEL REF IM CONNECTOR FIGURE 4 R8 BOTTOM VIEW 7 Connect the supplied 26 REF coaxial cable 3711168 to the REF OUT connector located near the right rear corner of the synthesizer board Posi tion the cable as shown in Figure 4 routing the free end of the coax cable along the front panel near volume control and up to the VHF Con verter assembly nearest the front panel 8 Position the R8 receiver so it rests on its bottom chassis with front panel facing towards you Plug the unconnected end of the 26 coaxial cable 3711168 into the REF IN connector 0 cated on the VHF converter assembly as shown in Figure 5 9 Locate the factory installed coaxial cable con nected to the rear panel CONV antenna input connector Disconnect the terminal end of this coax from the Front End Board connector Plug the coax cable into the RF IN terminal of the VHF Converter as shown in Figure 5 CONV ANT VHF INPUT CONVERTER REAR PA
46. Gas R25 R316 Di De 03 ANT 271 N HF ATTEN PREAMP 1 0000 3 ld 910 PBT END LIMITS 0 oot PBT CENTERING R L DRAKE Co 00000000000 2 00000000 3288745 C983 8 1 o Opus 0959 eo 200000000 je o o ap SEE oS oS 00000000 00000000000000000000 12000000000000D em 18 e 90000065 Jie CC dor 00000000 ons 08000060000 gt 202000009 0000000000 9000000 55 20098 DUUUUUUDUUUUUOODUUOU 000000000000 2220900 08 in 000 065000 oF e 200000000 290090900 0000000000 0000000000 00060000000 ego us fos 4 xO Og O77 5 O 10 O 250 eee je IO 0000600 EO Ore anc GEA 47 7 R377 K EN EE 328918 230 ces 00000 000000008 35 MHZ REF OSC SHIELD P N 456 0222 SHIELD P N 456 9258 Lar SO 10 Oz z O D 92508 EX Og a 82928 6 Sane
47. and shield cables that mate to a board mounted coaxial connector at each termination end Thus boards can be removed for part replacement if necessary and easily replaced for testing The first step in troubleshooting the R8 R8E should be isola tion of the malfunction to the major board level Refer to the Generalized Theory of Operation Section for a gen eral discussion of theory of operation and determine which circuit board and specific section of that board would cause the problem at hand In most cases the problem will involve only one of the four major boards Once the problem has been isolated refer to the appro priate portion of Section 2 for a full scale description of the circuit GENERALIZED THEORY OF OPERATION Receiver Section incoming signals from antenna 1 antenna 2 and con verter receptacles are first routed through the antenna switch module The 50 500 Ohm antenna 2 input is matched with a 9 1 transformer prior to being routed to the antenna switch module The output of this module is followed by a selectable at tenuator providing 10 of attenuation when enabled The signal is then sent to a 9 band pin diode switched bandpass filter network The bandpass filter output is routed through a selectable preamplifier providing a nominal 10 dB of gain when enabled The output of the preamp is then supplied to a master lowpass filter which serves to attenuate signals above 30 MHz The signal is then
48. lol re tc RA 0000 Q al 5 r a a Em 200 d 14358 B 5998 nm CRIB2 52186 r um Sha 5 gt C225 128 UN 7 zi 0 al 81 O 9 Lies odos simis sie 3288723 ol R122 51 n 6 5 g EEE Oy P es cia tu Sr 0 44560256 SHIELD gt e197 Blue MAZA 0196 B oa eso CD 45 5 243904 C239 508 med 478 R123 220 1644 SHIELD Rise ar 5 gt SO B O OO 3591856 JOH Jos 8 8 OO CR112 152186 OSHO O a 5 ARTEN R106 180 CR118 152185 7 6 152186 OSO STE Po prs i um LI06 C criaa CRIB5 152186 eras CRIEB 192186 152196 0 E 152186 0 O D 0 LI Kt ond O dr p XO 1105 TRATO TT C144 a5 141 152186 GEN 55 m Pd me 1 IB DO ORE 122 C C166 LC Leu Vea cn Eo O E O 1187 QU 10 135 180 al 3478024 5 IO 291 L123 Omio 16 1 SFN Cae VS R137 R144 ORBI 1 I1 gt i A un C120 A OF O cise 50 t 1500 C10 1108 eg UA TENN D Ocio
49. 04V a d ATTN ON 2 7VDC 111 C10 1 OFF 0 15 0 470pr 5808 5808 470PF y 22uF I PREAMP 2 0 107 Pios 1 FM ON 0 25V0C FM ON 1 9VDC 0 04 FR 107 ATTN ENABLE ENABLE OFF 4VDC 1105 220pF NE SUE OFF H FANN agw gt H ANTI ANTA 11 16V0C IN Our Aisi 1 1 4 ecd 95 WR 4 7K AGC PN A P B BAND 8 H 1 GNO 2 TSH tioa 0 5 1 5HH2 4 7 RSSI QUT ig 1 d m 113 no ovoc AUDIO OUT e AA nds 270uH 22uF VHF 2 7v0C casos an L L L104 2106 T C103 uj ree pue TII T 1103 1 TS t 8392 C257 C256 C255 C254 C253 C250 C249 casa C240 C245 C244 C243 100 4 7 3uF iuF iuF iur 1 iur iuF iur iuF iuF AUF 4uF 4 i THIS DOCUHENT CONTAINS INFORMATION WHICH 93 gt CONFIDENTIAL AND PROPRIETARY AND IT IS 16 0 1 0 SMHZ NOT TO USEO COPIED OR REPRODUCED IN C405 215 WHOLE OR IN PART OR DISCLOSED TO OTHERS 22uF WITHOUT THE EXPRESSED WRITTEN PERMISSION OF A L COMPANY COPYAIGHT 1994 A L DRAKE COMPANY Front End Board Schematic 17 Note This drawing applies to R8 R8E units with REAR PANEL ANT 2 500 3301253 50 amp LP100 5 BK
50. 1 4W RES 10K 5 1 4W RES C FILM 100 K 5 1 4W RES C FILM 10K 5 1 4W RES 47 5 1 4W RES C FILM 8 2 K 5 1 4W RES C FILM 4 7 K 5 1 4W RES C FILM 5 6 K 5 1 4W RES C FILM 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 22 K 5 1 4W RES C FILM 150 K 5 1 4W RES C FILM 10K 5 1 4W _ RES C FILM 10K 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 1 0K 5 1 4W RES C FILM 100 K 5 1 4W RES C FILM 100 K 5 1 4W RES C FILM 100 K 5 1 4W RES C FILM 100 K 5 1 4W RES C FILM 470 OHM 5 1 4W RES 100 K 5 1 4W RES C FILM 100 K 5 1 4W RES C FILM 470 K 5 1 4W RES 470 K 5 1 4W RES C FILM 470 K 5 1 4W RES 470 K 5 1 4W RES C FILM 470 K 596 1 4W RES C FILM 470 K 5 1 4W RES C FILM 220 OHM 5 1 4W RES C FILM 220 OHM 5 1 4W RES C FILM 220 OHM 5 1 4W REF RP 100 RP101 RP102 RP103 RP104 U100 0101 0102 0103 0104 0105 0106 0107 0108 0109 9110 um 0112 9113 9114 0115 0116 0117 9118 0119 0120 0121 0122 0123 0124 0125 0126 0127 0128 0129 0130 0131 0132 100 VR101 VR 102 WIA W2A Y100 Y101 Y102 Y103 PART NUM 3221220 3221220 3221220 3221220 3221220 3040011 3040247 3040120 3042130 3042004 3040009 4671318 3282128 3040007 3042026 3041166 3040094 3040003 3040007 3040005 3040006 3041042 3040480 3040480 3041168 3040157 3040157 3040480 3045007 3045007 3040097 3041167 3041167 3040097 3040480 3040480 3045007 3041064 3041063 3040031 3040031 3040031
51. 10 50 20 10 50 20 MF 20 YSP 1050 20 22 25 20 20 20 20 2096 20 1050 20 1950 20 CAP AXIAL 10 0 PF 5 NPO CAP AXIAL 39 0 PF 5 NPO CAP AXIAL 2 7 PF 10 GP 219 C220 C221 C222 C223 C224 C225 C226 C227 C228 C229 C230 C231 C232 C233 C234 C235 C236 C237 C238 C239 C240 C24t C242 C243 C244 C245 C246 C247 C248 C249 C250 C251 C252 C253 C254 C255 C256 C257 C258 C259 C260 C261 C262 C263 C264 C265 C266 C267 C268 C269 C270 C271 C272 C273 C274 C275 C276 C277 C278 C279 C280 PART NUM 3150595 3150350 3150896 3150595 3150350 3151515 3150350 3180012 3151648 3151405 3151405 3150595 3150896 3180064 3150595 3180012 3150750 3150040 3150690 3180064 3180012 3151648 3151405 3151405 3180012 3151515 3150350 3150350 3150115 3150245 3150115 3150350 3150508 3180109 3150305 3150115 3151405 3151648 3151405 3150350 3150305 3180109 3150508 3150350 3150115 3150245 3150115 3150350 3151405 3164032 3164160 3150350 3150779 3150350 3151515 3151405 3180109 3180109 3151515 3151515 3151515 3184068 DESCRIPTION CAP AXIAL 22 0 PF 5 NPO CAP AXIAL 10 0 PF 5 NPO CAP AXIAL 56 0 PF 5 NPO CAP AXIAL 22 0 PF 5 CAP AXIAL 10 0 PF 5 NPO CAP AXIAL 01 20 5 CAP AXIAL 10 0 PF 5 NPO CAP ELECTRO 1 50 20 CAP 10 MF 50V CAP AXIAL 001 MF 10 YSP CAP AXIAL 001 MF 10
52. 100 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 4 7 K 5 1 4W RES 33K 5 1 4W RES C FILM 470 OHM 5 1 4W RES C FILM 33 K 5 1 4W RES C FILM 100 OHM 5 1 4W REF R107 R108 R109 R110 R111 R112 R113 R114 R115 R116 R117 R118 R119 R120 R121 R122 R123 R124 R125 R126 R127 R128 R129 R130 R131 R132 R133 R135 R136 R137 R138 R139 R140 R141 R142 R143 R144 R145 R146 R147 R148 R149 R150 2151 R152 R153 R154 R156 PART NUM 3220055 3220085 3220090 3220085 3220210 3220235 3220315 3220090 3220060 3220200 3260612 3220055 3220055 3220210 3220300 3220347 3220330 3220055 3220055 3220210 3220055 3220055 3220210 3220055 3220045 3220055 3220015 3220355 3220085 3220055 3220055 3220210 3220035 3220060 3220055 3220235 3220055 3220055 3220210 3220035 3220035 3220005 3220090 3220055 3220055 3220210 3220345 3220070 DESCRIPTION RES C FILM 100 OHM 5 1 4W RES C FILM 270 OHM 5 1 4W RES 330 OHM 5 1 4W RES C FILM 270 OHM 5 1 4W RES C FILM 4 7 K 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 100 K 5 1 4W RES 330 OHM 5 1 4W RES C FILM 120 OHM 5 1 4W RES C FILM 3 3 K 5 1 4W RES VAR LIN 500K RES C FILM 100 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 4 7 K 5 1 4W RES C FILM 68K 5 1 4W RES C FILM 510 K 5 1 4W RES C FILM 220 K 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 4 7 K 5 1 4W RES C FILM 100 OHM 5 1 4W RES C
53. 2510099 INDUCTOR TOROID 2510089 INDUCTOR TOROID 2510089 INDUCTOR TOROID 2510089 INDUCTOR TOROID 2510089 INDUCTOR TOROID 3520503 ASSY 2 7 UH 3520503 CHOKE ASSY 2 7 UH 3920503 CHOKE ASSY 2 7 UH 3520503 CHOKE ASSY 2 7 UH 3520503 CHOKE ASSY 2 7 UH 3520501 CHOKE ASSY 1 8UH 3520501 CHOKE ASSY 1 8UH 3524219 COIL AXIAL 47UH 3280720 CONNECTOR 6 3030283 TRANSISTOR 38 179 3030507 TRANSISTOR 254192 3030507 TRANSISTOR 2SK192 3030507 TRANSISTOR 28K 192 3030507 TRANSISTOR 25 192 3030283 TRANSISTOR 3SK179 3030302 TRANSISTOR BFR91A 3030104 TRANSISTOR 2N3904 3030104 TRANSISTOR 2N3904 3030302 TRANSISTOR BFR91A 3220610 RES C FILM 4 7 5 1 4W 3220455 RES C FILM 100 OHM 5 1 4W 3220713 RES C FILM 100 K 5 1 4W 3220695 RES C FILM 56K 5 1 4W 3220415 RES C FILM 22 OHM 5 1 4W 3220695 RES C HLM 56K 5 1 4W 3220425 RES C FILM 33 OHM 5 1 4W 3220630 RES C FILM 8 2 5 1 4W 3220600 RESC FILM 3 3 5 1 4W 3220595 RES C FILM 2 7 5 1 4W 3220595 RES C FILM 2 7 5 1 4W 3220575 RES C FILM 1 5 5 1 4W 3220435 RES C FILM 47 OHM 5 1 4W 3220675 RES 33K 5 1 4W 3220675 RES C FILM 33 5 1 4W 3220675 RES C FILM 33K 5 1 4W 3220675 RESC FILM 33 5 1 4W 3220720 RES C FILM 150 K 5 1 4W 3220720 RES C FILM 150 K 5 1 4W 3220720 RES C FILM 150 K 5 1 4W 3220720 RES C FILM 150 5 1 4W 3220465 RSE 150 OHM 5 1 4W 3220720 RES C FILM 150 5 1 4W 3220720 RES C FILM 150 K 5
54. 3150640 3150750 3150350 3151405 3151364 3151260 3151648 3151064 3150640 3150540 3151405 3151364 3150168 3150896 3151648 3151648 3151648 3151648 3151425 3180152 3151362 3151648 3151648 3150900 3150640 3150540 3150350 3150896 3151405 3151364 3150168 3151260 3150245 3151648 3151648 3151648 3151648 3180018 3180064 3150420 3150750 DESCRIPTION CAP AXIAL 12 0 PF 5 NPO AX 10 MF 50V CAP ELECTRO 2 2050 CAP AXIAL 12 0 PF 5 NPO CAP AXIAL 33 0 PF 5 NPO CAP AXIAL 39 0 PF 5 NPO CAP AXIAL 10 0 PF 5 NPO CAP AXIAL 001 MF 1096 CAP RADIAL 220 PF 5 N470 CAP AXIAL 680 PF 295 NPO CAP AXIAL 100 PF 5 GP CAP AXIAL 330 PF 1096 5 10 MF 50V CAP ELECTRO 4700916 CAP AXIAL 001 MF 10 CAP AXIAL 001 MF 10 Y5P CAP AXIAL 680 PF 10 CAP AX 10 MF 50V CAP AXIAL 12 0 PF 5 NPO CAP AXIAL 27 0 PF 5 NPO CAP AXIAL 39 0 PF 5 NPO CAP AXIAL 10 0 PF 5 NPO CAP AXIAL 001 MF 10 CAP AXIAL 680 PF 2 NPO CAP RADIAL 220 PF 5 N470 CAP AX 10 MF 50V CAP AXIAL 100 PF 296 NPO CAP AXIAL 27 0 PF 5 NPO CAP AXIAL 18 0 PF 5 NPO CAP AXIAL 001 MF 1096 CAP AXIAL 680 PF 2 NPO CAP AXIAL 5 6 PF 10 NPO CAP AXIAL 56 0 PF 5 NPO CAP AX 10 MF 50V CAP AX 10 MF 50V CAP AX 10 MF 50V CAP AX 10 MF 50V CAP AXIAL 0022MF 2096 Y5P CAP ELECTRO 100050 CAP AXIAL 680 PF 10 10 MF 50V CAP 10 MF 50V CAP AXIAL 68 PF 295 NPO CAP AXIAL 27 0 PF 5 NPO
55. 3250361 3250325 DESCRIPTION RES C FILM 1 0K 5 1 4W RES C FILM 220 OHM 5 1 4W RES C FILM 22 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 22 OHM 5 1 4W RES C FILM 1 0K 5 1 4W RES C FILM 2 2 K 5 1 4W RES C FILM 8 2 K 5 1 4W RES C FILM 100 OHM 5 1 4W RES 10K 5 1 4W RES C FILM 2 2 K 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 10 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 270 OHM 5 1 4W RES C FILM 4 7 K 5 1 4W RES C FILM 220 OHM 5 1 4W RES C FILM 4 7 K 5 1 4W RES C FILM 220 OHM 5 1 4W RES C FILM 510 OHM 5 1 4W RES C FILM 220 OHM 5 1 4W 4 7K 5 1 4W RES 4 7 5 1 4W RES C FILM 100 K 5 1 4W RES C FILM 100 K 5 1 4W RES C FILM 4 7 K 5 1 4W RES C FILM 100 OHM 5 1 4W RES 5 1 4W RES C FILM 100 5 1 4W RES C FILM 100 K 5 1 4W RES 10K 5 1 4W RES C FILM 47 K 5 1 4W RES C FILM 22 K 596 1 4W RES C FILM 1 0 K 5 1 4W RES C FILM 470 OHM 5 1 4W RES 2 2 5 1 4W RES C FILM 47 K 596 1 4W RES C FILM 100 K 596 1 4W RES 47 5 1 4W RES C FILM 4 7 K 596 1 4W RES C FILM 47 K 5 1 4W RES C FILM 100 K 596 1 4W RES 18K 5 1 4W RES C FILM 3 3 K 5 1 4W RES 220 5 1 4W RES C FILM 4 7 K 5 1 4W RES C FILM 470 OHM 5 1 4W RES C FILM 390 OHM 5 1 4W RES M FILM 40 2 1 1 4W RES M FILM 20 0K 1 1 4 RES M FILM 324 K 1 1 4W RES M FILM 162 K 1 1 4W RES M FILM 80 6K 1 1 4 RES
56. 3524152 3524165 3524165 2510083 2510083 2510079 3524155 3524160 3524148 3524160 3524155 3524138 3524138 3524140 3524196 2510079 3520534 3520534 3520534 3520534 2510078 3524196 3524199 2510079 3045002 3045002 3045004 3280723 3280724 3280723 3280723 3280723 3280723 3280720 3280720 3030104 3030286 3030504 3030504 3030137 3030104 3030104 3030104 3030104 3220055 3220055 3220210 3220275 3220110 3220275 3220055 DESCRIPTION COIL AXIAL 0 1 UH COIL AXIAL 0 1 UH COIL RADIAL 5 6 UH COIL RADIAL 5 6 UH COIL RADIAL 5 6 UH COIL RADIAL 1 8 UH COIL RADIAL 5 6 UH COIL RADIAL 5 6 UH INDUCTOR TOROID INDUCTOR TOROID INDUCTOR TOROID COIL RADIAL 2 2 UH COIL RADIAL 3 3 UH COIL RADIAL 1 0 UH COILRADIAL 3 3 UH COIL RADIAL 2 2 UH COIL RADIAL 0 27 UH COIL RADIAL 0 27 UH COIL RADIAL 0 33 UH COIL RADIAL 270 0 UH INDUCTOR TOROID CHOKE ASSY 160 0 UH CHOKE ASSY 160 0 UH CHOKE ASSY 160 0 UH CHOKE ASSY 160 0 UH INDUCTOR TOROID COIL RADIAL 270 0 UH COIL RADIAL 1 0 MH INDUCTOR TOROID LC BAL MIXER SBL1 X L C BAL MIXER SBL1 X L C BAL MIXER SBL 3 CONN PIN MALE CONN P C 4 PIN MALE CONN P C 3 PIN MALE CONN P C 3 PIN MALE CONN P C 3 PIN MALE CONN P C 3 PIN MALE CONN P C 8 PIN MALE CONN P C 8 PIN MALE TRANSISTOR 2N3904 TRANSISTOR 3SK81 TRANSISTOR J 310 TRANSISTOR J 310 TRANSISTOR 2N5109 3493040 HEAT SINK TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 RES C FILM
57. 39 K 5 1 4W RES 100 K 5 1 4W RES C FILM 100 K 596 1 4W RES C FILM 10K 5 1 4W RES M FILM 0 0 OHM 1 1 4W RES C FILM 10K 5 1 4W RES C FILM 1 0K 5 1 4W RES C FILM 1 0K 5 1 4W RES C FILM 1 0K 5 1 4W RES C FILM 2 2 K 5 1 4W RES C FILM 2 2 5 1 4W RES C FILM 680 K 596 1 4W RES C FILM 100 K 596 1 4W RES C FILM 47 K 5 1 4W RES VAR 50K RES C FILM 100 K 596 1 4W RES 68 K 5 1 4W RES C FILM 33K 5 1 4W RES C FILM 100 K 596 1 4W RES C FILM 10K 596 1 4W RES C FILM 56K 5 1 4W RES 10K 5 1 4W RES 8 2 5 1 4W RES C FILM 10K 5 1 4W RES 1 2 5 1 4W RES C FILM 5 6 K 5 1 4W RES M FILM 0 0 OHM 1 1 4W RES C FILM 100 K 5 1 4W RES C FILM 220 OHM 5 1 4W RES C FILM 10 OHM 5 1 4W REF R176 R177 R178 R179 R180 R181 R182 R183 R184 R185 R186 R187 R188 R189 R190 R191 R192 R193 R194 R195 R196 R197 R198 R199 R200 R201 R202 R203 R204 R205 R206 R208 R209 R210 R211 R212 R213 R214 R215 R216 R217 R218 R219 R220 R221 R222 R223 R224 R225 R226 R227 R228 R229 R230 R231 R232 R233 R234 R235 R236 R237 R238 PART NUM 3220240 3220235 3220285 3220235 3220315 3220315 3250487 3250488 3260668 3220090 3220210 3220200 3220245 3220175 3220065 3220000 3220160 3220275 3220345 3220230 3220295 3220345 3220295 3220352 3220235 3220235 3220380 3220275 3220300 3220310 3220295 3220235 3260612 3220190 3220075 3220315 3220315 322
58. 5 N750 CAP AXIAL 47 0 PF 5 N750 CAP AXIAL 01 MF 20 CAP ELECTRO 22025 20 CAP AXIAL 001 1096 YSP CAP AXIAL 001 10 CAPELECTRO 10950 20 CAP AXIAL 01 MF 20 CAP AXIAL 001 MF 1096 CAP AXIAL 001 1096 CAP AXIAL 0022MF 20 CAP AXIAL 1 5 PF 10 GP REF C162 C164 C166 C168 C169 C170 171 C172 C174 C175 C176 C177 C178 C179 C180 C181 C182 C183 C184 C185 C186 C187 C188 C189 C190 C191 C192 C193 C194 C195 C196 C197 C198 C199 C200 C202 C203 C204 C205 C206 C208 C209 C210 C211 C212 C213 C214 C215 C216 C217 C219 C220 C221 C222 C223 C224 PART NUM 3166135 3166136 3151515 3151065 3150550 3150550 3151515 3180109 3205207 3151040 3150350 3151405 3205204 3205204 3151515 3150550 3151040 3150420 3150508 3151515 3180109 3150550 3205228 3150595 3150595 3205228 3151155 3151155 3151405 3151405 3151405 3205207 3151515 3151648 3151515 3150779 3150420 3150420 3151515 3180109 3150595 3151117 3180064 3151515 3150305 3150690 3150305 3150305 3151515 3180109 3151405 3150690 3151185 3150845 3151185 3150350 DESCRIPTION CAP CHIP 2 2PF 50V 0805 CAP CHIP 2 2PF 50V 0805 CAP AXIAL 01 MF 20 CAP AXIAL 100 PF 596 GP CAP AXIAL 20 0 PF 5 NPO CAP AXIAL 20 0 PF 5 NPO CAP AXIAL 01 MF 20 Y5P CAP ELECTRO 22025 20 CAP VAR TRIMMER 4 20 PF CAP AXIAL 82 0 PF 596 N750 CAP AXIAL 10 0 PF 595 NPO
59. 5mH POT CORE ASSY 4560254 SHIELD 9 5mH POT CORE ASSY 4560254 SHIELD 9 5mH POT CORE ASSY 4560254 SHIELD CHOKE ASSY 270 0 UH 9 5mH POT CORE ASSY 4560254 SHIELD 9 5mH POT CORE ASSY 4560254 SHIELD COIL RAD L 47 MH C7679 SCL CONN P C 3 PIN MALE CONN P C 3 PIN MALE CONN P C 3 PIN MALE CONN P C 3 PIN MALE CONN P C LG 2 PIN MALE CONN P C 3 PIN MALE CONN P C 3 PIN MALE CONN P C 3 PIN MALE CONN P C LG 2 PIN MALE CONN P C 3 PIN MALE CONN 3 PIN MALE CONN P C 3 PIN MALE CONN P C 8 PIN MALE TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR J270 TRANSISTOR MPSA13 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 35 81 TRANSISTOR 35 81 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 REF 9114 9115 Q116 Q117 Q118 Q119 Q120 Q121 Q122 Q123 Q124 Q125 Q126 Q127 Q128 Q129 Q130 Q131 Q132 Q133 Q134 Q135 Q136 Q137 Q138 Q139 6140 Q141 Q142 Q143 Q144 Q145 Q146 Q147 Q148 Q149 Q150 Q151 Q152 Q153 Q154 Q155 Q156 Q157 Q158 Q159 Q160 Q161 Q162 R100 R101 R102 R103 R104 R105 R106 R107 R108 R109 R110 R111 PART NUM 3030104 3030104 3030104 3030104 3030104 3030104 3030111 3030104 3030104 3030104 3030104 3030104 3030104 3030104 3030104 3030104 3030104 3030111 3030121 3030104 3030104 3030104 3030104 3030104 3030104 3030495 3030104 3030104 3030104 3
60. AGC slow AGC enabled BFO disabled SYNCH DET disabled NOTCH dis abled 2 Setthe BW to 6 KHz VOLUME to max EXTERNAL SPEAKER selected TONE to midrange and RF GAIN to maximum 3 Input the modulated 50 KHz signal into the IF strip through phono jack 4 Monitor with an oscilloscope the 1 KHz demodulated sinewave dropped across the 4 ohm load 5 With the VOLUME control at maximum adjust the detec tor gdin pof R 139 to obtain a 8 Volt PTP undistorted sinewave across the 4 ohm load This is equivalent to 2 37 watts 6 Check the twoline audio outputs for atleast 85 Volts sinewaves into 4 7K ohm loads This is equivalent to ap proximately 300 mv rms E Synchronous Detector Setup 1 Select AM mode and set the frequency as desired 2 Center the PBT pot fo 12 o clock 3 Set the signal generator to the same frequency as the receiver and set the level for 50 dBm 4 Adjust the VCO center frequency pot R 285 for2 5 VDC 0 01 V on pin 9 of IC U 112 5 Attach an oscilloscope to pin 3 of U 109 and reduce the signal generator level to zero 6 Asjust R 158 for 50 duty cycle of the observed square wave Then remove oscilloscope 7 Adjust the Signal Generator level to a level 20 dB below the AGC threshold and engage synchro detector Ob serve that it locks up satisfactorily and that the front pane SYNCHRO LED comes on Notch Null Adjustments Prerequisites 1 Place unit in SSB mode a
61. C FILM 10K 5 1 4W RES C FILM 33K 596 1 4W RES C FILM 33K 5 1 4W RES 33K 5 1 4W RES C FILM 2 2 K 596 1 4W RES C FILM 2 7 K 596 1 4W RES C FILM 10K 5 1 4W RES C FILM 10K 5 1 4W RES VAR PT10V 10K RES 3 9 5 1 4W RES C FILM 2 7 5 1 4W RES 12K 5 1 4W RES C FILM 1 5 MEG 5 1 4W RES C FILM 100 K 5 1 4W RES C FILM 3 3 K 5 1 4W RES 10K 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 2 2 K 5 1 4W RES C FILM 100 K 5 1 4W RES C FILM 680 OHM 5 1 4W RES C FILM 330 OHM 5 1 4 RES C FILM 100 K 596 1 4W RES C FILM 330 OHM 5 1 4W RES C FILM 680 OHM 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 3 3 K 5 1 4W RES C FILM 100 K 596 1 4W RES C FILM 100 K 5 1 4W RES C FILM 150 K 5 1 4W RES C FILM 4 7 MEG 5 1 4W RES 470 K 5 1 4W RES C FILM 150 OHM 5 1 4W RES C FILM 56 OHM 5 1 4W RES 270 5 1 4W RES C FILM 1 0 MEG 5 1 4W RES VAR PTIOV 20K RES 15K 5 1 4W RES 8 2 5 1 4W REF R366 R367 R368 R369 R370 R371 R373 R374 R375 R376 R377 R378 R379 R380 R381 R382 R383 R384 R385 R386 R387 RY100 RY 101 SW 100 U100 U102 U103 0104 0105 9106 0107 0108 0109 9110 9112 0113 0114 0115 0116 0117 100 VR101 VR102 PART NUM 3220160 3220235 3220235 3220285 3220315 3220235 3220055 3260620 3220317 3220210 3220205 3220315 3220315 3220210 3220315 3260672 3220040 3220330 3220145 3220350 3220315 3620112 3620108 3670541 3040097
62. C144 C145 C146 C147 C148 C149 C150 C151 C152 C153 C154 C155 C156 C157 C158 C159 PART NUM 3151648 3151405 3151648 3151405 3180241 3151259 3150350 3180109 3150305 3150690 3151648 3150305 3150595 3151648 3150305 3150420 3151648 3150305 3150350 3151648 3180241 3150078 3150690 3151648 3150350 3150305 3150640 3150305 3150640 3150350 3150640 3150350 3150640 3151405 3151648 3151648 3151405 3150640 3150899 3150640 3151425 3150899 3150896 3150750 3150750 3151405 3151405 3151405 3151405 3151405 3151405 3151425 3151405 3151405 3151065 3151515 3151515 3180109 3180012 3151515 DESCRIPTION CAP 10 MF 50V CAP AXIAL 001 MF 1096 CAP AX 10 MF 50V CAP AXIAL 001 1096 CAP ELECTRO 470016 CAP AXIAL 220 PF 1096 Y5P CAP AXIAL 10 0 PF 5 NPO CAP ELECTRO 22925 20 CAP AXIAL 8 2 PF 10 NPO CAP AXIAL 33 0 PF 5 NPO CAP AX 10 MF 50 CAP AXIAL 8 2 PF 10 NPO CAP AXIAL 22 0 PF 5 NPO CAP AX 10 MF 50 CAP AXIAL 8 2 PF 10 NPO CAP AXIAL 12 0 PF 5 NPO CAP AX 10 MF 50 CAP AXIAL 8 2 PF 10 NPO CAP AXIAL 10 0 PF 5 NPO CAP AX 10 MF 50V CAP ELECTRO 470916 CAP AXIAL 3 9 PF 10 NPO CAP AXIAL 33 0 PF 5 NPO CAP AX 10 MF 50V CAP AXIAL 10 0 PF 5 NPO CAP AXIAL 8 2 PF 10 NPO CAP AXIAL 27 0 PF 595 NPO CAP AXIAL 8 2 PF 10 NPO CAP AXIAL 27 0 PF 596 NPO CAP AXIAL 10 0 PF 5 NPO CAP AXIAL 27 0 PF 5 NPO CAP AXIAL 10 0 PF 5 NPO CAP AXIAL 27 0 PF 5 NPO
63. CAP AXIAL 001 MF 1096 CAP VAR TRIMMER 3 11 PF CAP VAR TRIMMER 3 11 PF 3501055 SHIELD CAP AXIAL 01 MF 2096 Y5P CAP AXIAL 20 0 PF 595 NPO CAP AXIAL 82 0 PF 5 N750 CAP AXIAL 12 0 PF 5 NPO CAP AXIAL 15 0 PF 5 NPO CAP AXIAL 01 MF 20 CAP ELECTRO 22025 20 CAP AXIAL 20 0 PF 5 NPO CAP VAR TRIMMER 10 120 PF CAP AXIAL 22 0 PF 5 NPO CAP AXIAL 22 0 PF 595 NPO CAP VAR TRIMMER 10 120 PF CAP AXIAL 150 PF 1096 CAP AXIAL 150 PF 1096 CAP AXIAL 001 MF 1096 CAP AXIAL 001 1096 CAP AXIAL 001 MF 1096 Y5P CAP VAR TRIMMER 4 20 PF CAP AXIAL 01 MF 2096 Y5P CAP AX 10 MF 50V CAP AXIAL 01 MF 20 CAP AXIAL 43 0 595 NPO CAP AXIAL 12 0 PF 5 NPO CAP AXIAL 12 0 PF 5 NPO CAP AXIAL 01 MF 20 CAPELECTRO 22025 20 CAP AXIAL 22 0 PF 5 NPO CAP AXIAL 120 PF 5 GP CAP ELECTRO 10950 20 CAP AXIAL 01 20 CAP AXIAL 8 2 PF 10 NPO CAP AXIAL 33 0 PF 5 NPO _ CAP AXIAL 8 2 PF 10 NPO CAP AXIAL 8 2 PF 10 NPO CAP AXIAL 01 MF 20 CAP ELECTRO 22025 20 CAP AXIAL 001 10 YSP CAP AXIAL 33 0 PF 5 NPO CAP AXIAL 180 PF 10 YSP CAP AXIAL 47 0 PF 5 N750 CAP AXIAL 180 PF 10 5 CAP AXIAL 10 PF 5 NPO REF C225 C226 C227 C228 C229 C230 C231 C232 C233 C234 C235 C236 C237 C238 C239 C240 C241 C242 C243 C244 C245 C246 C247 C248 C249 C250 C25 C252 C253 C254 C255 C256 C257 C258 CF100 CF101 CR100 CR101 CR102 CR103 CR104 CR105
64. COPIED OR REPRODUCED IN WHOLE OR IN PART OR DISCLOSED TO i 5 OTHERS WITHOUT THE EXPRESSED HRITTEN PERMISSION OF THE R L DRAKE COMPANY COPYRIGHT 1891 R L DRAKE Co CCHEMATIC REF 08211 ASSEMBLY PARTS TOP SIDE VIEW DRAKE R L DRAKE RS FRONT END D 8135 SOLE y 5 1 RT 2108830 PE 4 oF 4 DO NOT SCALE DRAWING Front End Board D 8135 18 Aa 4 5 56 d xd Xd II de 3 I4 16 I i7 8 i285C G 0 8 21 1 22 23 24 25 This drawing applies to R8 R8E units with Revisions and printed circuit board artwork IST 1 0 2ND 1 0 XN qe oo lt BLACK C188 luF O EIE 1146 1 tzepr I i 6124 2510093 3205228 1680 odio O 1 AUDIO out B i 2 31 gt GH yd 8 C127 2 188 C156 ipaa 3205207 ara C SIGNAL STRENGTH d fs luF 3140411 Db Of ven P193 L178 1 GND S 6 15 1206 OGEE AGC im O IC 100 al C232 C233 11 16 Jed laser dos ci
65. FILM 10 OHM 5 1 4W RES C FILM 270 OHM 5 1 4W RES C FILM 180 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 180 OHM 5 1 4W RES C FILM 5 6 K 5 1 4W RES C FILM 820 OHM 5 1 4W RES C FILM 1 0K 5 1 4W RES C FILM 120 OHM 5 1 4W RES C FILM 2 7 5 1 4W RES C FILM 10K 596 1 4W RES C FILM 680 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 68 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 100 K 5 1 4W RES C FILM 470 OHM 5 1 4W RES C FILM 1 8 5 1 4W RES C FILM 1 8K 5 1 4W RES C FILM 470 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 100 K 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 10K 5 1 4W RES 8 2 5 1 4W RES C FILM 68 K 526 1 4W RES C FILM 47 K 596 1 4W RES C FILM 100 K 5 1 4W RES C FILM 470 OHM 5261 4W RES C FILM 470 OHM 5 1 4W RES C FILM 620 OHM 5961 4W RES C FILM 470 OHM 5 1 4W RES C FILM 12 K 5 1 4W RES C FILM 10K 596 1 4W RES C FILM 100 K 596 1 4W RES C FILM 22 K 5 1 4W RES C FILM 22 K 5 1 4W RES C FILM 100 K 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 12K 5 1 4W RES C FILM 470 OHM 5 1 4W RES C FILM 620 OHM 5 1 4W RES 5 6 5 1 4W RES C FILM 270 OHM 5 1 4W RES 15K 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 100 K 5 1 4W RES C FILM 470 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W REF R224 R225 R226 R227 R228 R229 R230 R231 R232 R233 R234 R235 R236 R237 R238 R239 R240 R241 R242 R
66. FILM 100 OHM 5 1 4W RES C FILM 4 7 K 5 1 4W RES C FILM 100 OHM 5 1 4W RES 68 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES 22 OHM 5 1 4W RES C FILM IM 5 1 4W RES C FILM 270 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 4 7 K 5 1 4W RES C FILM 47 OHM 5 1 4W RES C FILM 120 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 4 7 K 5 1 4W RES 47 OHM 5 1 4W RES 47 OHM 5 1 4W RES C FILM 10 OHM 5 1 4W RES C FILM 330 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 4 7 K 5 1 4W RES C FILM 470 K 5 1 4W RES C FILM 180 OHM 5 1 4W REF PART NUM 3220055 3220055 3220210 3220010 3220010 3220010 3220055 3220090 3220035 3220210 3220160 3220235 3220315 3220235 3220315 3220047 3220085 3220015 3220315 3220235 3220315 3220235 3220315 3220315 3220315 3220315 3220200 3220215 3620112 3620108 3620108 3620108 3040595 3040094 3040509 3040031 3040092 3140126 3120289 3120136 DESCRIPTION RES C FILM 100 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 4 7 K 5 1 4W RES C FILM 15 OHM 5 1 4W RES C FILM 15 OHM 5 1 4W RES C FILM 15 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 330 OHM 5 1 4W RES 47 OHM 5 1 4W RES C FILM 4 7 5 1 4W RES C FILM 1 0 K 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 100 K 596 1 4W RES 10K 5 1 4W RES C FILM 100 K 5
67. MHz Ist IF frequency to the 50 KHz 2nd IF frequency while simultane ously helping to further suppress the image response at tenuation provided by the crystal filter The IRM uses a 45 05 MHz 3 KHz LO frequency to accomplish the conversion of the 45 MHz IF signal to the 50 KHz 2nd IF signal The 50 KHz 2nd IF signal is then applied to the main IF circuitry The first stage of the IF is a dual gate FET to which AGC voltage is applied The output of this amplifier is routed to the noise blanker circuit When activated the noise blanker acts on short duration noise pulses removing them before they reach the 50 KHz bandpass filters which would cause the pulses to be stretched thus rendering the blanker ineffective Following the noise blanker is the first of two 4 pole bandpass filter networks which provide a cascaded 8 pole response An amplifier between the first 4 pole and second 4 pole provides another stage of AGC controlled gain as well as impedance matching for the filter sections The two filter networks are electroni cally switched to provide the 6 0 4 0 2 3 1 8 and 0 5 KHz IF bandwidths Following the IF selectivity sig nal is further amplified by one last dual gate FET which is also AGC controlled before being demodulated ei ther by a product detector for USB LSB CW RTTY and AM or an AM synchronous detector The product detector utilizes a locally generated 50 KHz beat fre quency oscillator BFO carrier that
68. The main compo nent in PLL1 is 0109 MB87086 U109 is similar to 0125 and U126 consisting of 2 programmable dividers and a phase comparator The programmable dividers are prograrnmed by the uP through the serial data bus The reference signal at Pin 8 is divided by R1 The VCO signal at Pin 1 is divided by R1 like R3 and R2 is constant and the uP loads R1 only during the power on sequence NI is variable and needs to be updated whenever the frequency changes A 100 KHz step is achieved by changing N1 and a 10 Hz step 5 obtained PLL2 The step size obtained by is determined by the refer ence signal and R1 Step size ref signal RI The reference signal at Pin 8 is 35 MHz 21 350 resulting in astep size of 100 KHz Thisalsois the frequency at which the phase comparison is performed inside U109 The output of the phase comparator is two pulsed control signals at Pins 15 and 16 Both control signals are normaily at 5 volts and pulse low 0 2 volts when active The pulsewidth determines the amount of correction and is derived from the relative phase information Pin 15 pro vides the UP pulse and Pin 16 the DOWN pulse The charge pump andloop filter produce a DC tuning voltage from the UP and DOWN pulses There are actually 2 different charge pump loop filter combinations that tune the 4 oscillators of VCO1 The low band oscillator coversthe range from 45 00000 to 52 49999 MHz andhasits own charge
69. UF BAND 6 8405 8L 4X Hoe i 7 5 10 5MHZ L146 Lass 72 2510063 2510083 iur J103 C143 81403 4 S47 en 4 117 98 5 KHz 10 120 OiuF 8129 ON 4V0C Ls 4 7K 9 C490 is C234 OFF 0 1VDC 22pF 22pF C208 0g2urF ON 0 2 ka 400 a AND 5 9 FILM OFF 0 7 0 34 3524119 T 4 0 7 5HHZ 1 147 157 nue y U100 IVY SY 3 4 9100 o vom HC3362 10 2 2510083 2510083 R165 2M3904 10 47 CF101 Liso A140 casa 891443 3140405 82uH Wide 47 10 120pF 8 100K caso gt gt t 33uH z2uF CF100 107 7415145 ning A160 3140403 2 A 15 9 Laza 6142 vasa AIG2 1000pF J102 3 L 49 22pF 4 2 15 ON avec 5 40V 1 2ND OFF 0 2voc iur C140 F LO IN R126 T 45 05 lio 9117 TIAM gt _ E ee u IMAGE REJEC Ls ub uu gt iur iuF 2 J E 4 MIXER SECTION 1 4 5 4 0MHZ I FL101 8423 C gt i 1 8483 R116 U101A 41 3140415 3 3K 93 3K 220K i1 LM358 ur 344 Lores 4 2 C 22uH QN 5 3VDC i0v OFF 2 0V0C FM QN 10 245MHz ON 0 2Bvpp 34 3MHz R120 4 V06 0 4 7K 4 FM OFF 0354 BANO 3 2 0V0C a FH ON 0 25V0C 1 5 2 5HHZ avoc 0
70. VCO 3 VDC coil L 112 so that the tuning voltage is 8 05 VDC x 0 05 VDC as meas ured at the junction of 2 2K ohm resistor R 165 and 1K ohm resistor R 144 6 Tune the radio to 15 00000 MHz VCO at 60 00000 MHz andinsure that the tuning voltage is greater than 3 0 VDC 7 Tune the radio to 30 00000 MHz VCO at 75 00000 MHz and adjust the high band VCO 4 VCO coil L 114 so that the tuning voltage is 8 05 VDC 0 05 VDC as measured at the junction of 2 2K ohm resistor R 154 and IK ohm resistor R 145 8 Tune the radio to 22 00000 MHz V CO at 67 00000 MHz and insure that the tuning voltage is greater than 3 0 VDC 9 Measure the VCO output level at J 100 for each frequency listed below Output level should be 7 dBm 3 dB 0 10000 MHz 7 49999 MHz 7 50000 MHz 14 99999 MHz 15 00000 MHz 21 99999 MHz 22 00000 MHz 30 00000 MHz F 50 KHz BFO Checks 1 With the receiver in the CW 558 RTTY modes meas ure the output of the 50 KHz phone jack J 106 using an os cilloscope 2 The level at this point should be approximately 1 5 volts and the frequency should be as shown on the follow ing table 005 MODE FREQ USB 48 6 MHz LSB 51 4 MHz CW 49 2 MHz IV 52 2 MHz 3 Observe that the output this jack drops to zero on the AM and FM modes II FRONT END BOARD ALIGNMENT AND TEST A Check of Front End Bandpass Filters 1 Calibrate a spectrum analyzer and tracking oscillator with a through connecti
71. filtered by C253 and L110 prior to being sent to the AGC circuits SECOND IF BOARD PARTS LIST REF PART NUM 3180064 3180109 3180018 3151650 3180109 3151425 3151433 3151459 3151040 3180064 3151515 3180018 3180109 3180241 3180012 3151648 3184060 3180018 3180064 3151648 3151648 3180018 3180018 3151648 3151648 3180239 3180239 3180018 3180018 3180064 3180064 3151065 3180064 3151648 3150690 3150690 3151405 3151587 3180064 3151260 3184039 3180064 3184150 3180348 3180348 3151648 3180018 3180018 3180064 3151432 3151433 3180064 3180152 3151648 3180064 DESCRIPTION CAP ELECTRO 10050 20 CAP ELECTRO 22 25 20 CAP ELECTRO 2 2 50 CAP AX 1 MF 100V MET FILM CAP ELECTRO 22025 20 CAP AXIAL 0022MF 20 Y5P CAP AXIAL 0033MF 20 Y5R CAP AX 0047 80 20 250 CAP AXIAL 82 0 PF 5 N750 CAPELECTRO 10050 20 CAP AXIAL 01 MF 20 Y5P CAP ELECTRO 2 2050 CAP ELECTRO 22025 20 CAP ELECTRO 470016 CAP ELECTRO 1050 20 CAP AX 10 50V CAP FILM 047 50V 5 CAP ELECTRO 2 2050 CAP ELECTRO 10050 20 CAP AX 10 50V CAP AX 10 MF 50V CAP ELECTRO 2 2050 CAP ELECTRO 2 2850 CAP 10 MF 50V CAP AX 10 MF 50V CAP ELECTRO 470025 RADIAL CAP ELECTRO 470925 RADIAL CAP ELECTRO 2 2050 CAP ELECTRO 2 2050 CAP ELECTRO 10050 20 CAP ELECTRO 10950 20 CAP AXIAL 100 PF 5 GP CAP ELECTRO 10050 20 CAP 10 MF 50V CAP AXIAL 33 0 PF 5 NPO CAP AXIAL 33 0 PF 5 NPO CAP AXIAL 001 MF 10
72. the signal to the BPF The audio then enters the squelch gate U105A The squelch reference is the buffered AGC line from U102B and the squelch trip point is set via the front panel control The squelch trip signal selects a terminated input resulting in muted audio This selector IC feeds the AM or FM audio to a buffer U107A and 5 KHz low pass filter U100A The output of the LPF is split info three paths two buffered line audio outputs and a volume controlled audio power amp U104 The output of the power amp passes through the headphone jack before switching between the internal and or external speaker s 6 5 VDC Generator The 5 volt supply is utilized in the MOSFET gain control circuitry It is generated by a free running 115 KHz multivi brator oscillator composed of crosscoupled transistor stages Q116 and 9121 Transistor stage Q120 provides reliable pullup to the 10V supply on positive excursions of the output signal Q120 also provides reliable startup of the oscillator due to the initial charging of C231 When 10 volts supply is applied C231 begins charging until a level sufficient to turn on Q121 isreached The action of turning on Q121 turns Q116 and 6120 off which in turn sends a pulse thru C230 to turn Q120 on and the cycle begins again The resulting output pulses are rectified by CR116 and CR124 and applied to filter capacitor C299 A zener diode CR123 regulates the output voltage to 5 VDC The output is further
73. ts C153 Bia HEADPHONE 114 1 dou 30 gt 5 3405 A a 4938 BL Adae ENTEINKL_ i 2113 R170 C100 5 PIN 7 F p 30 Aans 10V vou 1 m Qiii FH ENK O 10v CC CLI u 203904 1M4148 4 e 2 v AMET CR113 dg A118 103 L i CR102 9 1N4148 8228 L104 e 203904 gt C103 14 1M4146 91 0120 BEST an gt Auf HET FILH Xo sio 204125 0 SH y COAX C129 t R213 8 53 1 7 360441015 100K AUD I 5132 I vosie 45 um 2 sv ren caos AMP 1 5 7 22uF assy gt T ls 104 SYNCH LED A250 C202 Iss 53 gt Es 184148 A226 22uF ioouF 10v0 FROM e Wr 100 3256 cases 8111 PIN 1 u 1N4148 H C255 155927 A309 casa 3 3k 470 1001 1 aos 129 M dur ui Ax 47K HAN tio Ld gt d 2132 1 l SQUELCH IS CONFIOENTIAL AND PROPRIETARY IT IS BAN Iw d 100K NOT TO BE USED COPIEO OA AEPACOUCED IN WHOLE A IN PART OR DISCLOSED TO OTHERS WITHOUT THE EXPRESSEO WAITTEN PERMISSION OF R L DRAKE COMPANY 1991 A L DRAKE COMPANY RESISTOR R387 caso t313 C229 1000 5 CAPACITOR INDUCTOA TRANSISTOR 0162
74. 0 Industrial Drive Franklin Ohio 45005 5 Customer Service and Parts Telephone 513 746 6990 Telefax 513 746 4683 CAUTION Refer installation to qualified service technician to prevent personal injury or damage to the equipment Prior to starting installation of your new VHF converter carefully unpack the converter PC board assembly and its associated cables and mounting hardware You will need to use a Philips screwdriver during installation NOTE A magnetized screwdriver facilitates the removal and installation of screws in the proce dure that follows Identify the following items 1 1001590 VHF Converter Assembly 1 43711160 Coaxial Cable 8 Length 1 43711168 Coaxial Cable 26 Length 1 2707293 6 Conductor 7 Length 1 4350171 Retaining Bracket 1 3320244 Screw 4 40 x 1 4 Pan Head Philips Install the VHF Converter assembly as follows DISCONNECT THE R8 RECEIVER FROM THE AC POWER SOURCE 1 Remove the top cover from the R8 receiver by removing 5 6 32 x 1 4 Pan Head Philips BLACK screws Retain the cover and screws for reassem bly 2 Remove the bottom cover from the R8 receiver by removing 6 4 40 x 1 4 Pan Head Philips screws Retain the cover and screws for reassem bly 3 Identify the 6 conductor cable 17 length and plug it onto the VHF converter assembly Figure 1 being carefull to align the connector with the RED conductor on Pin 1 of the VHF converter assemb
75. 0 MF 50V CAP DISC 120 10 SOV CAP DISC 680 10 YSP SOV REF C163 C164 C165 C166 C167 C168 C169 C170 C171 C172 C173 C174 C175 C176 C177 C178 C179 C180 C181 C182 C183 C184 C185 C186 C187 C188 C189 C190 191 192 193 194 195 196 197 198 199 C200 C201 C202 C203 C204 C205 J101 J102 J103 L101 L102 L103 L104 L105 L106 L107 L108 L109 L110 L111 L112 L113 L114 L115 L116 PART NUM 3151649 3151649 3151515 3180125 3164012 3164165 3180125 3164165 3164027 3180125 3180125 3164153 3151649 3151649 3164153 3164153 3151649 3151649 3164153 3205199 3180125 3205199 3180125 3151649 3151649 3151649 3151649 3151649 3164165 3164165 3151649 3151649 3151649 3164165 3164165 3151649 3205199 3205199 3164056 3164056 3164056 3164056 3150168 3280042 3280042 3280042 2510095 2510094 3524124 3524124 3520501 3520501 3520501 3520501 2510102 3524041 2510102 2510121 2510121 3520503 3520503 2510122 DESCRIPTION CAP RAD 10 50V CAP RAD 10 MF SOV CAP AXIAL 01 20 CAP ELECTRO 47 16 RADIAL CAP DISC 12 0 5 NPO 50V CAP DISC 680 10 50V CAP ELECTRO 47 16 RADIAL CAP DISC 680 10 50V CAP DISC 27 0 5 NPO 50V CAP ELECTRO 47 16 RADIAL CAP ELECTRO 47 16 RADIAL CAP DISC 180 5 50V CAP RAD 10 MF 50V CAP RAD 10 MF SOV CAP DISC 180 5 NPO 50 CAP DISC 180 5 NPO SOV CAP RAD 10 MF 50V CAP RAD 10 MF 5
76. 00 09 1 0000089 M 35 48 45 58 55 58 N z MOUNT THESE PARTS ON SOLDER SIDE P 0 R THIS e CONTAINS INFORMATION HHICH ASSEMBLY NOTES IS NOT TO BE USED COPIED OR REPRODUCED 7 nn IN OR IN PART OR DISCLOSED 5 1 NOTE THE ITEMS INDICATED THAT ARE INSTALLED ON THE CIRCUIT SIDE OTHERS WITHOUT THE EXPRESSED HRITTEN PERMISSION OF THE R L DRAKE COMPANY COPYRIGHT 1990 R L DRAKE Co e 11000 2000 ALIGNMENT 1 POWER SUPPLY VOLTAGE CHECKS AND SETTING CLOCK TIMER A Power Supply Check 1 With the R8 unit turned on measure the following volt age busses at 108 volts and 132 volts AC Line voltage Measure at 216 volts and 265 volts AC Line voltage for R8E Switched unregulated 11 7 min 14 3 max 10 volts 95min 10 5 max 5 volts 475 min 5 25 max 5 volts 4 50 min 5 50 max B Setting Oscillator for Clock Timer 1 Jumper tpgether pins 1 and 2 of test connector P 105 and connect a reciprocal counter to this jumper 2 Adjust trimmer C 402 for a counter reading of 16 00000 Hz 3 Remove the shorting jumper on test terminals of P105 installed in step 1 II SYNTHESIZER AND PBT ALIGNMENT AND TEST A 35 MHz Reference Oscillator 1 Attach an accurate counter to PIN 1 of U 130 on the syn th
77. 00 240 30 _L 1 P109 L 8175 t Raas LL YES ep 2 1 SHITCH 60107 109 C6111 1 i mi 330 1 P105 12 Paes 11 1 e 22uF 1 47mH M 4 t 2 ch106 O 1 T 1 Sui 3 1Vpp c178 2u C343 C8115 H H 680 43 27 100V 6800UF C144 23 EH 2 py 68 5 0022 i LM 344005 14 C161 A 2x 5 caos c210 1000 220 fH 0109 5105 N470 5 5 35K81 D THERHAL 1 LI 5 1 3030286 Rees pr 1 CIRCUIT BREAKER 1 C316 C212 2 i r10v UNSW gt 1 1000 J108 RYs09 3 BANDPASS E saven 9 C317 C214 t Sa F LTER 4 98443 100 RELAY 1 2x 2x x 7 1 13 18VDC SW gt ALL NPNOS 2 434 9 5mH 5592 er 9240 0 ACL CAPS IN PICOFARADS 4 BANDPASS 1 pi 1 1 1 A292 0106 10V SUPPLIES ARE 5 4 0142 1 MPSA13 SWITCHEO SW D 22K 1 LTE R 2 mE 1 UNLESS OTHERWISE 1 1 NOTED Y 3 i L masa I ALL NPN S 243904 1 s REIT asa CEU 9 235 D DETEC M 7 8257 wr 8275 22k T 1 i 0144 294 sur ness L d124 As AE ASAS A
78. 030104 3030104 3030104 3030104 3030104 3030292 3030104 3030104 3030111 3030104 3030104 3030104 3030286 3030104 3030504 3030104 3030104 3030104 3030111 3030201 3220004 3220140 3220110 3220275 3220275 3220275 3220235 3220315 3220235 3220200 3220275 3220200 DESCRIPTION TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N4125 TRANSISTOR 23 794 TRANSISTOR 2 5 04 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N4125 TRANSISTOR 2N4402 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR J270 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 13 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N4125 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 3SK81 TRANSISTOR 2N3904 TRANSISTOR 310 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N4125 TRANS 2N5953 TO92 NS PACK 97 RES C FILM 6 8 OHM 5 1 4W RES C FILM 680 OHM 5 1 4W RES C FILM 470 OHM 5 1 4W RES C FILM 33 5 1 4W RES C FILM 33K 5 1 4W RES C FILM 33 K 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 100 K 5 1 4W RES C FILM 10K 5 1 4W R
79. 0345 3220235 3220235 3220380 3220275 3220300 3220310 3220295 3220330 3220040 3220315 3220040 3220205 3220045 3220045 3220235 3220235 3220380 3220260 3220260 3220260 3220260 3220275 3220260 3220235 DESCRIPTION RES C FILM 12K 5 1 4W RES C FILM 10K 5 1 4W RES 47 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 100 K 596 1 4W RES C FILM 100 K 5 1 4W RES M FILM 100 K 196 1 4 W RES M FILM 200 K 196 1 4 W RES VAR PTIOV 20K RES C FILM 330 OHM 5 1 4W RES C FILM 4 7 K 5 1 4W RES C FILM 3 3 K 5 1 4W RES C FILM 15K 5 1 4W RES C FILM 1 5 5 1 4W RES C FILM 150 OHM 5 1 4W RES M FILM 0 0 OHM 1 1 4W RES C FILM 1 0 K 5 1 4W RES 33K 5 1 4W RES C FILM 470 K 5 1 4W RES C FILM 8 2 K 5 1 4W RES 56 5 1 4W RES C FILM 470 K 5 1 4W RES C FILM 56 K 5 1 4W RES 820 5 1 4W RES C FILM 10K 596 1 4W RES 10K 5 1 4W RES C FILM 10 MEG 10 1 4W RES C FILM 33 K 5 1 4W RES C FILM 68 K 596 1 4W RES C FILM 82K 596 1 4W RES 56K 5 1 4W RES 10K 5 1 4W RES VAR LIN 500K RES 2 2 5 1 4W RES C FILM 220 OHM 5 1 4W RES C FILM 100 K 5 1 4W RES C FILM 100 K 5 1 4W RES C FILM 470 K 596 1 4W RES C FILM 10K 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 10 MEG 10 1 4W RES C FILM 33 5 1 4W RES C FILM 68 5 1 4W RES C FILM 82 K 5 1 4W RES C FILM 56 K 5 1 4W RES 220 5 1 4W RES C FILM 56 OHM 5 1 4W RES C FILM 100 K 5 1 4W RES C FILM 56 OHM 5 1 4W RE
80. 0V CAP DISC 180 5 NPO SOV CAP VAR TRIMMER 2 5 12PF CAP ELECTRO 47 16 RADIAL CAP VAR TRIMMER 2 5 12PF CAP ELECTRO 47 16 RADIAL CAP RAD 10 MF 50V CAP RAD 10 MF SOV CAP RAD 10 MF 50V CAP RAD 10 MF SOV CAP RAD 10 MF 50V CAP 680 10 SOV CAP DISC 680 10 SOV CAP RAD 10 MF SOV CAP RAD 10 MF SOV CAP RAD 10 MF 50V CAP DISC 680 10 YSP SOV CAP DISC 680 10 50V CAP RAD 10 MF 50V CAP VAR TRIMMER 2 5 12PF CAP VAR TRIMMER 2 5 12PF CAP DISC 56 0 5 NPO SOV CAP DISC 56 0 5 NPO 50V CAP DISC 56 0 5 NPO 50V CAP DISC 56 0 595 NPO 50V CAPRAD 5 6 10 NPO SOV CONN COAX MT TMP JO1X CONN COAX PC MT TMP JO1X MT ZTMP JO1X INDUCTOR TOROID INDUCTOR TOROID COIL VAR 0 046UH BRASS COR COIL VAR 0 046UH BRASS COR CHOKE ASSY 1 8UH CHOKE ASSY 1 8UH CHOKE ASSY 1 8UH CHOKE ASSY 1 8UH INDUCTOR TOROID COIL AIR 1 1 2T 125 1 D INDUCTOR TOROID INDUCTOR TOROID INDUCTOR TOROID CHOKE ASSY 2 7 UH CHOKE ASSY 2 7 UH INDUCTOR TOROID L117 L118 L119 L120 121 122 L123 L124 L125 L126 L127 L128 L129 L130 L131 P100 Q101 9102 Q103 Q104 Q105 Q106 Q107 Q108 Q109 Q110 R101 R102 R103 R104 R105 R106 R107 R108 R109 R110 R111 R112 R113 R114 R115 R116 2117 R118 R119 R120 R121 R122 R123 R124 R125 R126 R127 R128 R129 R130 R131 R132 R133 R134 R135 R136 PARTNUM DESCRIPTION 2510122 INDUCTOR TOROID 2510099 INDUCTOR TOROID
81. 0pF FS cies CR105 108 gt 152208 0117 i 2 Rize B 2DF 152186 d TO Loop 3 4125 1 t 150 gt 4 gt 5 078 3HHZ 8165 1 C109 I 5 ME NER sun PTS 21 ON gt 1 i L108 miss 1101 gt 100K 8173 1 3524118 470 5 6uH FH ERA 1 560 Cy 01168 9 270 C170 a EU A120 cess 150 ap 295 mau t 2208 lt gt 5606 2206 O01UF casas FT cass 5 E R210 d 270 i 15597 1 T 22k i 0 16 9161 A131 EL 2N3904 120 5153 1 150 Ti A160 IX 4346 470uF 1 15V C128 0108 d z T t EN 25 192 5 1 BFO DIGITAL ciay LOH aj REFERENCE i 7 nao 152186 8 20 150 x L T EA on as 5 A300 I T R 1 gt 22pF 10 0 C 7 91320 9987 J106 1 1110 A123 LI 2157 307 _I cars nib E 470 510 120pF rame 0386 6377 i 001 001 Laso i iBuH 535 4 1 D 1 Auf 0 130 9109 US 1 ir 254192 60 57HHZ cias 2 CR107 8132 10pF 152185 B 2pF 1 450K 4 1 15 casas 225 I 1 T I 12 C pi YI 1 103 T 184148 2 3524116 470 5 B R113 1 2 0404 RE eee CL 2 9041 Ch 1 ius R257 ta
82. 1 4W 3220720 RES C FILM 150 K 5 1 4W 3220720 RES 150 K 5 1 4W 3220485 RES C FILM 270 OHM 5 1 4 3220435 RES 47 OHM 5 1 4W 3220435 RES C FILM 47 OHM 5 1 4W 3220435 RES C FILM 47 OHM 5 1 4W 3220585 RES 47 5 1 4W 3220585 RES C FILM 47 5 1 4W 3220435 RES C FILM 47 OHM 5 1 4W 3220435 RES 47 OHM 5 1 4W 3220435 RES 47 OHM 5 1 4W 3220435 RES C FILM 47 OHM 5 1 4W REF R137 R138 R139 R140 R14 R142 R143 R144 R145 R146 R147 R148 R149 R150 R151 R152 R153 R154 R155 R156 R157 R158 R159 R160 R161 R162 R163 R164 R165 R166 R167 R168 R169 R170 R171 R172 R173 R174 R175 R176 R177 R178 R179 R180 R181 R182 R183 R184 R185 R186 R187 R188 R189 PART NUM 3220612 3220475 3220475 3220475 3220470 3220455 3220425 3220590 3220475 3220415 3220475 3220590 3220635 3250212 3250212 3250129 3220610 3220635 3220530 3220610 3220473 3220700 3220635 3220595 3220610 3220595 3220610 3220660 3220455 3220455 3220660 3220660 3220455 3220455 3220660 3220473 3220505 3220505 3220700 3220505 3220505 3250206 3220465 3220455 3220455 3220465 3220530 3250206 3250141 3220465 3220455 3220455 3220465 DESCRIPTION RES C FILM 5 1 K 5 1 4W RES C FILM 220 OHM 5 1 4W RES C FILM 220 OHM 5 1 4VV RES C FILM 220 OHM 5 1 4W RES C FILM 180 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 33 OHM 5 1 4W RES C FILM 2 2 K 5 1 4W RES C FILM 220
83. 1 4W RES C FILM 75 OHM 5 1 4W RES C FILM 270 OHM 5 1 4W RES C FILM 22 OHM 5 4VV RES C FILM 100 K 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 100 K 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 100 K 5 1 4W RES C FILM 100 K 5 1 4W RES C FILM 100 K 5 1 4W RES C FILM 100 K 5 1 4W RES 3 3 5 1 4W RES C FILM 5 6K 596 1 4W RELAY TAKAMISAWA RZ 12K RELAY III MZ12HG RELAY IIT MZ12HG RELAY III MZ12HG I C MC3362 I C LM358 7415145 IC 78LO5 ACP LC LM317L7 CRYSTAL FILTER 450128 MATCHED SET OF TWO CRYSTAL 34 3 MHZ CRYSTAL 10 245 MHZ 86103 1 FIL 11 156VOC FH HF QVDC VHF v 0470 0107 253904 72 75 11 16Y0C FIL A183 100 ee lt 9109 203904 L 58 L168 2510079 2510079 L100 3620112 c230 9838 91 PREAMP ON 1 evnc OFF 0 0V BANDPASS FILTERS L162 92902 B L160 v CRi24 BANO 9 22 30MHZ C817 22 9 7V0C Ei Cl 7VC0CI 0102 PINS 1 7 40 18 8 WHEN BELECTED 0 4VDC WHEN NOT SELECTED 1102 PINS 12 186 4 9V0C 08 0V0C DEPENDENT ON BAND iov 7 5 0 2 9 52 a iur c172 YR100 22uF 78L08 U102 1B0uH 1473 2510028 PREAMP CI 1 5V0C 0 0V
84. 129 for maximum level Approximately 1 5 volts PTP should be observed at this point 5 Pre tune VCO 1 coil L 108 3 5 turns down from flush with top of shield can Set frequency to 7 49999 MHz in the CW mode 6 Measure the 11 4 MHz level at pin 1 of U 109 using an oscilloscope with high impedance probe and adjust the three violet coils L 120 thru L 122 for maximum level Approximately 2 volts should be seen at this point E Loop 1 Adjustments 1 Tune radio to 7 49999 MHz VCO at 52 49999 MHz and adjust the low band VCO 1 VCO coil L 108 so that the tuning voltage is 8 05 0 05 VDC as measured at the junction of 2 2K ohm resistor R 154 and 1K ohm resistor R 142 Measure the VCO ia at J 100 The frequency should be 52 49999 MHz 2 Tune the radio to 0 10000 MHz at 45 10000 MHz and insure that the tuning voltage is greater than 3 0 For R8E model tune the radio to 0 15000 MHz VCO at 45 15000 MHz and insure that the tuning voltage is greater than 3 05 VDC 3 Tune the radio to 14 99999 MHz VCO at 59 99999 MHz and adjust the low mid band VCO 2 VCO coil L 110 so that the tuning voltage is 8 05 VDC 0 05 VDC as meas ured at the junction of 2 2K ohmresistor R 165 and 1K ohm resistor R 143 4 Tune the radio to 7 50000 MHz VCO at 52 00000 MHz andinsure that the tuning voltage 5 greater than 3 0 5 Tune the radio to 21 99999 MHz at 66 99999 MHz and adjust the hi mid band
85. 1515 3180064 3180064 3180064 3180064 3151515 3180012 3180109 3151515 3151515 3151515 3151515 3151515 3180012 3180012 3150350 3150750 3150040 DESCRIPTION CAP ELECTRO 1050 20 CAP ELECTRO 1850 20 CAP AXIAL 01 MF 20 Y5P CAP FILM 1 100V 10 CAP ELECTRO 100 50 CAP TANT RAD L 1 0 35 10 CAP ELECTRO 22 25 20 CAP AXIAL 01 20 CAP ELECTRO 100 50 CAP TANT RAD L 1 0 35 10 CAP FILM 1 100V 10 CAP AXIAL 100 PF 5 GP CAP AXIAL 01 20 Y5P CAP AXIAL 100 PF 5 GP CAP AXIAL 10 0 PF 5 NPO CAP AXIAL 43 0 PF 5 NPO CAP AXIAL 01 20 CAP AXIAL 2 7 PF 10 GP CAP AXIAL 3 9 PF 10 NPO CAP AXIAL 4 7 PF 10 NPO _ CAP AXIAL 1 5 PF 10 GP CAP AXIAL 2 7 PF 10 GP CAP AXIAL 2 7 PF 10 GP CAP AXIAL 10 0 PF 5 NPO CAP AXIAL 001 MF 10 CAP AXIAL 100 PF 5 GP CAP AXIAL 001 MF 10 Y5P CAP ELECTRO 1000 16 RAD L CAP AXIAL 1 5 PF 10 GP CAP AXIAL 43 0 PF 5 NPO CAP AXIAL 1 5 PF 10 GP CAP AXIAL 43 0 PF 5 NPO CAP AXIAL 10 0 PF 595 NPO CAP AXIAL 01 MF 2096 CAP ELECTRO CAP ELECTRO CAP AXIAL 01 CAP AXIAL 01 CAP AXIAL 01 CAP ELECTRO CAP ELECTRO CAP AXIAL 01 CAP ELECTRO CAP ELECTRO CAP ELECTRO CAP ELECTRO CAP AXIAL 01 CAP ELECTRO CAP ELECTRO CAP AXIAL 01 CAP AXIAL 01 CAP AXIAL 01 CAP AXIAL 01 CAP AXIAL 01 CAP ELECTRO CAP ELECTRO 1950 20 22025 20 20 2096 2096 1950 20 1050 20 20 10 50 20 10 50 20
86. 16 3524165 3524116 3524165 3524156 3524155 3524156 3524156 3524104 3524104 3524104 3524111 3524176 3524176 3524176 3524176 3524111 3524111 3524165 3524529 3524152 3524152 3524117 3524117 3524152 3524152 3524104 3524104 2510078 3524104 3524177 3524177 3524181 3524181 3524165 3524160 3524160 2510084 3524172 3524104 3524104 3524138 3524111 3524515 3524156 3524165 3524176 3280720 3280724 3280718 3280718 3280719 DESCRIPTION COIL AXIAL 0 15 UH COIL VAR 0 35 UH COIL RADIAL 5 6 UH COIL VAR 0 35 UH COIL RADIAL 5 6 UH COIL VAR 0 25 UH COIL RADIAL 5 6 UH COIL VAR 0 25 UH COIL RADIAL 5 6 UH COIL RADIAL 2 7 UH COIL RADIAL 2 2 UH COIL RADIAL 2 7 UH COIL RADIAL 2 7 UH COIL VAR 7 1 2T 7M VIOLET COIL VAR 7 1 2T 7M VIOLET COIL VAR 7 1 2T 7M VIOLET COIL VAR 0 19 UH COIL RADIAL 22 0 UH COIL RADIAL 22 0 UH COIL RADIAL 22 0 UH COIL RADIAL 22 0 UH COIL VAR 0 19 UH COIL VAR 0 19 UH COIL RADIAL 5 6 UH COIL VAR SHLD COIL RADIAL 1 8 UH COIL RADIAL 1 8 UH COIL VAR 0 50 UH COIL VAR 0 50 UH COIL RADIAL 1 8 UH COIL RADIAL 1 8 UH COIL VAR 7 1 2T 7M VIOLET 3501055 SHIELD COIL VAR 7 1 2T 7M VIOLET 3501055 SHIELD INDUCTOR TOROID COIL VAR 7 1 2T 7M VIOLET 3501055 SHIELD COIL RADIAL 27 0 UH COIL RADIAL 27 0 UH COIL RADIAL 39 0 UH COIL RADIAL 39 0 UH COIL RADIAL 5 6 UH COIL RADIAL 3 3 UH COIL RADIAL 3 3 UH INDUCTOR TOROID COIL RADIAL 18 0 UH COIL V
87. 180064 3151648 3180064 3151515 3180064 3151515 3180064 3180018 3151065 8151065 3151425 3151648 3151345 3180152 3180012 3180018 3151515 3180241 3151259 3151405 3151515 3020090 3020090 3020090 3020090 3020090 3020090 3024811 3024811 3024811 3024811 3020220 3024811 3020090 3020090 3020220 3020220 3020401 3020090 3020090 3020050 3020220 3020220 3020050 3020401 3020090 3020050 3020090 3020090 3020090 3020090 3020090 3020401 3020090 3020220 3020090 3020090 DESCRIPTION ELECTRO 10050 20 CAP ELECTRO 10050 20 CAP AX 10 MF 50V CAPELECTRO 10950 20 CAP 10 MF 50V CAPELECTRO 10050 20 CAP AXIAL 01 MF 20 Y5P CAPELECTRO 10950 20 CAP AXIAL 01 MF 20 Y5P CAPELECTRO 10950 2095 CAP ELECTRO 2 2050 CAP AXIAL 100 PF 5 GP CAP AXIAL 100 PF 5 GP CAP AXIAL 0022MF 2095 Y5P CAP 10 MF 50V CAP AXIAL 470 PF 1096 Y5P CAP ELECTRO 100050 CAPELECTRO 1050 20 CAP ELECTRO 2 2050 CAP AXIAL 01 MF 20 CAP ELECTRO 470016 CAP AXIAL 220pF 1096 5 CAP AXIAL 001 MF 10 5 CAP AXIAL 01 MF 2096 Y5P DIODE 1N4148 DIODE 1N4148 DIODE 1N4148 DIODE 1N4148 DIODE 1N4148 DIODE 1N4148 DIODE 6A2 DIODE 6A2 DIODE 6A2 DIODE 642 DIODE 1N4005 PLASTIC DIODE 6A2 DIODE 1N4148 DIODE 1N4148 DIODE 1N4005 PLASTIC DIODE 1N4005 PLASTIC DIODE 15997 2 04973 7 DIODE 1N4148 DIODE 1N4148 DIODE 1N751A 5 1V 5 5VV DIODE 1N4005 PLASTIC DIODE 1N4005 PLASTIC DIODE 1N751A 5 1V
88. 19 20 21 22 23 11 15V0C IN 6247 du T ga TL L 33ur gt CH 2B 1N4005 PREAMP ON C ATIN om 13 PREAMP ATTN OFF 42 9V0C PREAMP ON 0 6V0C OFF OVD 24 25 Front serial S D 8211 Note This drawing applies to R8 R8E units with November 1991 End Board Schematic I 7 N numbers previous to 11100000 113 7418145 4 7 2 5 4 0KHZ 141 0 5 1 5M9MI2 T 10v 9 22uF A102 78 4 7 100K cios 7 22uF 49 BAND 1 0 1 0 5MHZ CAPS NOT TO USED COPIEO OR REPRODUCED IN WHOLE OR IM PART OISCLOStO TO OTHERS WITHOUT THE EXPRESSED WRITTEN PERMISSION OF A L DRAKE COMPANY T 35 0103 9 D 310 2 0V0C A pr TES y H 1130 1 gt 2510082 H R136 10 Liza 10Y 98L 3 L149 C193 P304 9 7VDC Bias 159 270 C181 La 5 150pF C194 25140 gt ioa 1 8pF 1000pF 1000pr 0404 n143 Li 1 133 3 11pF gt 60432 9310 CHIP 3dj iig xrios 3884112 chie 8 114 54 8947 cis7 Lb 0DOprF aff 300F E63 sonopr _ ew I 192 1 wu 1 ciii e dup 13 2 Dur Liam
89. 19 20 21 22 23 24 25 26 Synthesizer Microprocessor 43 700mV cise C174 1 10pF T L120 41 0 41 1HHz PTP Board Schematic D 8137 Note This drawing applies to R8 R8E units with Revision printed on circuit board artwork C167 Oi uF 45 1 75 0HHz v 357 LO TO FAONT END 001uF 4100 l 63 49 53 DiUF 100mV 3 8254 4 75V0C E n n 5 4V0C 3 5M9M gt SepF 207107 2 5 3 5 9156 ass Le C164 q YO 1 5v aso 2 6 50 5 51MHZ 6236 u126 279 A IV 2 7pF OiuF C284 145357 C316 1 1 H 1 O1uF 1 1 1145 1144 4 BFI Arda 1 t 39 38uH 70HHZ gt 1129 1 3 1706 97201 YEL D 9 i 200mv 327 5 9 Ares p 0114 1 4 75Vp 4 9993 3 3904 c AUF 149 C121 A C214 212 0030 8444 c147 IX 1 3 90L 1uF O04uF A152 0105 i C207 T T T 270 3563
90. 2 xal 36 x1 8 181 eol 211 221 231 241 251 261 Interconnect Diagram we D 8270 m ch EXT DC VHF CONV GUICK CONNECT FOR 220 240 vac OPERATION HEMOVE 8900 B AND CHANGE F2 T200mA SLO BLO 81 VOLTAGE REAR PANEL 105 50 KHz EXT oc FROM FRONT END COMMON CONVERTER OPTIONAL NORM OPEN BUD FH DET Rss d 4357 gt DONADA A SECOND I F AUDIO are POWER SUPPLY C 16V UNSW 5V RR DIANA J101 4104 4103 VHF ANT 1 50 KHz 500 50 50 OHH OHM SPK1 SPEAKER 1 P101 1 o DEO di HEADPHONE H TINTOS FRONT END lt AUCI ENA gt IND gt REICH a 4108 SOKHZ K P101 DISPLAY SYNCH LED eee Len prepr av B R D MUADUDND PRVADAJO mx ee HHHHHHHel l tue 222222222 1 81 INTERFACE c 8884 8 DISPLAY BOARD KBD FUNCTION NUMERIC KEY 18 KEY PAD
91. 20 CAP ELECTRO 1050 20 CAP AXIAL 33 0 PF 5 NPO CAP AXIAL 68 0 PF 5 NPO CAP AXIAL 33 0 PF 5 NPO CAP AXIAL 01 20 CAP AXIAL 01 20 CAP AXIAL 01 20 YSP CAP ELECTRO 22 25 20 CAP AXIAL 01 MF 20 CAP AXIAL 01 20 CAP AXIAL 470 PF 10 CAP AXIAL 43 0 PF 5 NPO CAP AXIAL 120 PF 5 GP CAP AXIAL 43 0 PF 5 NPO CAP AXIAL 01 20 CAPELECTRO 1 50 20 AXIAL 01 MF 20 YSP CAP AXIAL 01 20 CAP AXIAL 01 MF 20 CAP ELECTRO 1050 20 CAP AXIAL 01 MF 20 CAP ELECTRO 1050 20 CAP ELECTRO 22 25 20 CAP AX 10 MF 50V CAP AXIAL 001 10 CAP AXIAL 001 1096 CAP AXIAL 001 MF 1096 YSP CAP AXIAL 01 MF 20 CAP AXIAL 470 PF 10 YSP CAP AXIAL 0015MF 2096 CAP AXIAL 470 PF 10 CAP AX 10 MF 50V CAP AXIAL 001 MF 1096 CAP 10 MF SOV C342 C343 C344 C345 C346 C347 C348 C349 C350 C35 C352 C353 C354 C355 C356 C357 C358 C359 C360 C361 C362 C363 C364 C365 C366 C367 C368 C369 C370 C371 C372 C373 C374 C375 C376 C377 C378 C379 C380 C381 C382 C383 C384 C385 C386 C387 C388 C389 C390 C391 C392 C393 C394 C395 C396 C397 C398 C399 C400 C401 C402 C403 C404 PART NUM 3151405 3151405 3151405 3151648 3151405 3180109 3151405 3151405 3151345 3150690 3151405 3150690 3150750 3151405 3150420 3151405 3150420 3180109 3150690 3151515 31502
92. 23 L110 T 251 l 70 49K 1 mor EUM THiS DOCUMENT CONTAINS INFORHATION WHICH gt ONLY LAST USEO DES 13 CONFIDENTIAL AND PROPRIETARY ANO IT 15 CB116 gt um NOT TO BE USED COPIED OR REPRODUCED IN 119 C424 15897 RESISTOR WHOLE OR IN PART OR DISCLOSEO TO OTHERS zzur CAPACITOR WITHOUT THE EXPAESSEO WRITTEN PERMISSION OF ORAKE COMPANY oa er a Sel gt 1551 an 5 1 2 3 A 5 5 2 8 9 101 141 421 131 141 45 16 171 181 181 201 51 221 231 241 35 54 50 kHz Soour 49 Gina FROM 305 329 pa N 1 5 G cese ChiiB vases V s Zar RE uS aa PLANEA GAIN MA 89 mum 48 8367 10K iA m ax HB w7H 6909 1108 i 2N3904 CL 1 Sage Tox 60136 8380 porem HN i B 199 24580 4 184148 FH BSSI 1 SZAH z R344 CRi20 en NS TN Sur Cir 3 esas AUDIO ION OA D 104146 1994 a P pisi cum 230 ERM CR132 15597 02 FROM 106 3 1 ray Sour gt FROM J106 254 POWER Azur PIN 7 4 NONE PIEN Lud TERN 4 Ee SHEP uei SUPP
93. 243 R244 R245 R246 R247 R248 R249 R250 R251 R252 R253 R254 R255 R256 R257 R258 R259 R260 R261 R262 R263 R264 R265 R266 R267 R268 R269 R270 R271 R272 R273 R274 R275 R276 R277 R278 R279 R281 R282 R283 R284 R285 PART NUM 3220055 3220235 3220205 3220140 3220275 3220220 3220235 3220245 3220140 3220205 3220235 3220055 3220055 3220110 3220315 3220055 3220055 3220055 3220235 3220055 3220055 3220210 3220260 3220075 3220145 3220110 3220235 3220145 3220055 3220210 3220055 3220190 3220230 3220005 3220025 3220002 3220002 3220025 3220005 3220230 3220190 3220045 3220015 3220045 0000000 3220055 3220235 3220215 3220180 3220035 3220085 3220055 3220220 3220235 3220075 3220235 3220190 3220220 3220235 3220055 3220195 DESCRIPTION RES C FILM 100 OHM 5 1 4W RES C FILM 10K 5 1 4W RES 3 9 5 1 4W RES C FILM 680 OHM 5 1 4W RES 33 5 1 4W RES C FILM 6 8 K 596 1 4W RES C FILM 10K 5 1 4W RES C FILM 15K 5 1 4W RES C FILM 680 OHM 5 1 4W RES 3 9 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 470 OHM 5 1 4W RES C FILM 100 K 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 4 7 K 5 1 4W RES C FILM 22 5 1 4W RES 220 OHM 5 1 4W RES C FILM 820 OHM 5 1 4W
94. 25 20 CAP ELECTRO 22025 20 CAP ELECTRO 10950 20 ELECTRO 22025 20 CAP ELECTRO 2 2050 CAP AX 10 MF 50V CAP ELECTRO 10950 20 CAP AXIAL 12 0 PF 5 NPO CAP AXIAL 39 0 PF 5 NPO CAP AXIAL 27 0 PF 5 NPO CAP AXIAL 10 0 PF 5 NPO CAP AXIAL 001 10 CAP AXIAL 680 PF 2 NPO CAP AXIAL 22 0 PF 5 NPO CAP RADIAL 220 PF 5 N470 CAP AXIAL 27 0 PF 5 NPO CAP AXIAL 43 0 PF 5 NPO CAP AXIAL 18 0 PF 5 NPO CAP AXIAL 12 0 PF 5 NPO CAP AXIAL 12 0 PF 5 NPO CAP AXIAL 39 0 PF 5 NPO CAP AXIAL 51 0 PF 2 NPO CAP AXIAL 12 0 PF 5 NPO CAP AXIAL 100 PF 2 NPO CAP AXIAL 91 0 PF 2 NPO CAP AX 10 MF 50V CAP ELECTRO 10050 20 CAP AXIAL 01 MF 20 CAP ELECTRO 2 2050 CAP AXIAL 01 MF 2096 CAP AXIAL 470 PF 10 CAP AXIAL 01 MF 20 CAP ELECTRO 22 50 L LEAK CAP ELECTRO 22 50 L LEAK CAP AXIAL 001 10 CAP AXIAL 001 10 CAP ELECTRO 10 50 20 CAP ELECTRO 47 50 CAP ELECTRO 10950 20 CAP AX 10 MF 50V CAP AX 10 MF 50V CAP RAD 0033MF 2 NPO C338 C339 C340 C341 C342 C343 C344 C345 C346 C347 C348 C349 C350 C35 C352 C353 C354 C355 C356 C357 C358 C359 C360 C361 CR100 CR101 CR102 CRT103 CR104 CR105 CR106 CR107 CR108 CR109 CR110 CRT12 CR113 CR114 CR115 CR116 CR118 CR119 CR120 CR121 CR122 CR123 CR124 CR125 CR126 CR127 CR128 CR129 CR130 CR131 CR132 CR133 CR134 CR135 CR136 PART NUM 3180064 3180064 3151648 3
95. 261 2nd IF Audio Power Supply Board Schematic 0 8212 Note This drawing applies to R8 R8E units with revision printed circuit board artwork DC RESISTANCE CHECK USING VIVM BETWEEN POINT A ANO CHASSIS GNO BETWEEN POINT AND CHASSIS GNO BETWEEN POINT AND CHASSIS GND WARNING A PARTS WITHIN DOTTEO LINE ARE CRITICAL WITH RESPECT TO RISK OF FIRE AND ELECTRIC SHOCK 8900 IN U S CAN UNITS ONLY REMOVE FOR 220 240 Vac OPERATION IN EUROPE 200 3 20072 1N4005 22 C VOLTAGE 114 SELECT 4 X 1M4005 SHITCH P105 THERMAL CIRCUIT BREAKER 1 t LI 1 1 4 V 4 1 1 t Y 1 1 1 RY100 10V UNSW o H9ov Sw 1 1 1 4 4 1 1 4 INDUCTOR TRANSISTOR COPYRIGHT 1992 L DRAKE COMPANY 220 Gil 5 C127 56 220pF Tode 3 1900 6 2 lt 131 16V0C Bx R199 432 5 8V PIN 2 gt 8x 5 B20K 15 neos 9 avoc 1 10K C319 C317 C214 1 100 II 51 L T n 1 En 100 21 2x 2x 2x ex R209 nice I9 63 16V06
96. 270 3220235 3220070 3220085 3220175 3220190 3220085 3220100 3220180 3220110 3220160 3220160 3220060 DESCRIPTION RES C FILM 22 OHM 5 1 4W RES C FILM 15K 5 1 4W RES C FILM 270 OHM 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 150 OHM 5 1 4W RES C FILM 47 OHM 5 1 4W RES 47 5 1 4W RES C FILM 4 7 K 5 1 4W RES 47 5 1 4W RES C FILM 4 7 K 5 1 4W RES C FILM 47 K 5 1 4W RES C FILM 4 7 K 5 1 4W RES 47 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 1OK 596 1 4W RES C FILM 180 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FLM 10K 5 1 4W RES C FILM 470 OHM 5 1 4W RES C FILM 470 OHM 5 1 4W RES C FILM 470 OHM 5 1 4W RES C FILM 470 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 150 K 5 1 4W RES 150 5 1 4W RES C FILM 150 K 5 1 4W RES C FILM 150 K 5 1 4W RES C FILM 150 K 5 1 4W RES C FILM 150 K 5 1 4W RES C FILM 150 K 5 1 4W RES C FILM 150 K 596 1 4W RES C FILM 1 0K 5 1 4W RES C FILM 120 OHM 5 1 4W RES 10K 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 1 0 K 5 1 4W RES C FILM 1 0 K 5 1 4W RES C FILM 1 0K 5 1 4W RES C FILM 1 0K 5 1 4W RES C FILM 22 OHM 5 1 4W RES C FILM 510 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 27 K 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 180 OHM 5 1 4W RES C FILM 270 O
97. 3 is constant the uP loads R3 only during the power onsequence whichis initiated by depressing the front panel power button is variable and needs to be loaded whenever the frequency changes A I KHz step is achieved by changing The step size of PLL3is determined by the reference signal into Pin 1 of U125 and the division ratio R3 as follows Step size reference frequency divided R3 The reference signal at Pin 1 is 3 5 MHz and R3 3500 giving aminimum step size of 1 KHz This also represents the frequency at which the phase comparator inside U125 compares the VCO signal at Pin 8 to the reference signal The output of the phase comparator is a DC tuning volt age at Pin 5 used to tune the VCO The tuning voltage is filtered by the loop filter a LPF consisting of U124 R229 R228 C280 and C281 The loop filter output voltage at Pin 7 of 0124 15 applied to varactors CR118 and CR119 in the VCO This VCO consisting of transistors 0124 and associated components tunes from 65 001 MHz to 65 100 MHz in 1 KHz steps Capacitors C250 C251 C253 C254 variable inductor L134 and varactors CR118 and CR119 determine the frequency of oscillation The VCO3 output is filtered by a LPF and buffered by Q130 and 9122 After Q130 the VCO3 output is mixed with 70 MHz at U128 and translated from the 65 001 65 100 MHz range to the 4 999 4 900 MHz range The 4 999 4 900 MHz signal is the VCO signal presented to 0125 Pin 8 A 5
98. 3040131 3040112 3040551 3041054 3040094 3040097 3040011 3040033 3040033 3041054 3040029 3041054 3041054 3041054 3040094 3040075 3040031 3040164 3040160 DESCRIPTION RES C FILM 1 0 K 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 10K 596 1 4W RES C FILM 47 K 5 1 4W RES C FILM 100 K 596 1 4W RES 5 1 4W RES 100 OHM 5 1 4W RES VAR PTIOV LIN 100K RES C FILM 120 K 596 1 4W RES C FILM 4 7 K 5 1 4W RES C FILM 3 9 K 5 1 4W RES C FILM 100 K 5 1 4W RES C FILM 100 K 5 1 4W RES C FILM 4 7 K 5 1 4W RES C FILM 100 K 596 1 4W RES VAR PTIOV 50K RES C FILM 56 OHM 5 1 4W RES C FILM 220 K 5 1 4W RES 820K 5 1 4W RES C FILM 680 K 596 1 4W RES C FILM 100K 5 1 4W RELAY TAKAMISAWA RZ 12K RELAY III MZ12HG SW SLIDE DP3T SLY 23 05P LC LF353N MC3405 1496P IC TDA2003 14052 IC LM358 LC LF353N 74HC74 I C 74HC86 I C 74HC86 LC 14052 I C 74HC4046 I C 14052 14052 IC 14052 LC LM358 IC ULN3845A LC 78LO5 ACP 1 C 2940 10 2940 5 atar Petrelli an T 1227 171 tel 19 eol 211 eel 231 241 251 26 schematic D 8212 50 kHz E IN FROM N 1 5 1 i i i o BLANKER AGC m Br 542 tov 2358 Note Thi
99. 4 20pF L ag el A131 C174 398 848 C164 314012 aioz 4 20pF 3 9pF BF 3N204 176 Cis6 CHIP 9433 1000pF cies 22 P 139 1000pF Liza 6 4 7uH P zx 2515082 3 m 5 see Nor o 1317 B2pF P103 G 0 1 af S Q 158 R144 C 6230 Dco 120 10V 2 4 8155 45 MHZ IF SECTION e 1N4148 40V ON 4 m Bpr i e FM DETECTOR c242 I 022uE ciis LM iur Las gt SBL 1X 446 170 1473 2510083 160uH J103 lt IF OUT c a2 1 50 KHz 10 120pF ON 3 4V0C C188 cese c233 C234 0 4V0C 22pF O33uF 022uF 22pF 39L IX FILM FILM FILH Pon 1157 L472 IN LYN 2810023 2540083 1369 160uH 10 2 2 2 5 160uH 2M3994 66401 9440 caps 10 120pF s A301 ALSO 15 1 1000pF J102 DI avon j OFF 0 2V0C Lo 1N IMAGE REJECT TI TM MIXER SECTION REN id FLsos 13140411 Heyer 5 3V0C OFF 2 0V0C ON 10 245HHz FH ON 0 28Vpp 34 3MHr 4 ivoc 0 84V 3 4V0C FM OFF 5454 ovoc OFF E OVAC FM 0 01Vpp ATTN ON 2 7V0C OFF OFF 0 15v0C PREAMP ON 2 8VDC T OVO P108 GND FH ON 0 25V0C ON 1 9VDC ENABLE IKTTH gt FM ENABLE OFF 0 4V0C gt ERS F VHF HE7VHE gt
100. 4 c246 4700pF ATTN ON 2 7V0C OFF OVOC y ATTN gt BANDPASS FILTERS c215 c214 C 124 E y Lisa 847 1160 Y gt Smet 98222 taag pios _ _ Ave Soue ta L161 C213 caiz 4 1 peer Liss E 194 1 XF101 XF100 2 2uH 2 2uH E B 2pF 1000pF 9405 nis 2510104 3140126 3140125 2510103 T A157 7 o 5 5 155 100 1 1 1 157 01 I 01uE 8459 9447 nian ve ES S r 1000pF 4 7K 1 BAND S BAND SELECTED E i one 925 Sea 160 E 5 4 gt us craig L a 2200178 2 Lise L Gn gt C217 1 26 T ESI 2 2 isi sd 1000pF C195 1 CHIP ids cn 199006 Soh Sse ere sick 2510052 30 SEE NOTE 1 K Laso 153 c sa 4 7K caso BAND p 1000pF 1 142 CR114 15 22MHZ 10V 52 HH TE 1 0102 PINS 1 7 9 10 16 45 MHZ IF SECTION cies 8 6V06 WHEN SELECTED 6 BuH dev 9 4VDC WHEN NOT SELECTED gt 608147 9 PINS 12 15 ciai 4 OR R3486 DEPENDENT ON BAND 4 7K O1uF bd BAND Liza y casio 10 5 SANA 4 0186 1 Lasa geste FM DETECTOR 40V 4 ico C406 1
101. 45 IF 2222 MPLIFIER AMPLIFIER 50 KHz IF 50 KHz IF 50 KHz IF m UN AMPLIFIER AMPLIFIER AMPL FIER 45 1 78 0 MHz ici to K EXTERNAL SPEAKER e e D 4 it EIER TONE CONTROL NOTCH CONTROL SQUELCH CONTROL AUDIO GAIN vco CONTROL 45 05 HHz 3 KHZ SOKHz 3KHz 46 050 MHz S 10 050 MHz SN76514 PLL 4 887088 100 KHZ 4 1 34 0 MHz 35 MHz 35HHz Hi 350 LPF 1 41 340 41 0 44 4 MHz FR 70 MHz 5 3 5M9M2 X2 10 HB487 3476514 6 0 6 4 MHz M5467 5 2 50 3 49 N2 250 349 vco 2 60 0 61 0 MHz 1 7 7 0 PASSBAND CONTROL OPTION PLL 2 MC145157 10 KHZ 63 4900 63 48989 MHz PLL 3 BPF MC145157 4 kHz 3 8 VHF CONVERTER OPTIONAL REFERENCE 4 800 4 999 MHZ 83 3500 X3 4900 4998 SN76514 A SN76514 es ES 65 001 85 100 MHZ 6 5001 8 5100 MHZ vco 3 Na FREQ 35MHZ L 2 38 FREQ 35MHz 1 8 se 70 MHz ed FREQ vco 35MHz L 1 18 Diz 9 562 A As232C INTERFACE KEYBOARD D MHz THIS DOCUMENT CONTAINS INFORMATION WHICH IS CONFIDENTIAL PROPRIETARY AND IT IS NOT TO BE USED COPIEO OA REPRODUCED IN WHOLE OR IM PART OH DISCLOSED TO OTHERS WITHOUT THE EXPRESSEO WAITTEN PERMISSION OF A L ORAKE COMPANY COPYRIGHT e 1991 A L ORAKE COHPANY 9 II I gt LI3 14 8106 gt 991 1
102. 45 3151405 3151345 3151515 315T155 3150845 3151515 3180109 3151648 3151155 3151515 3151648 3151515 3151117 3151648 3151405 3180109 3150899 3150750 3150690 3150899 3151648 3151515 3180109 3180012 3180002 3151648 3180295 3151648 3151648 3150690 3150690 3151648 3151648 3151648 3151648 3151648 3151648 3151648 3151648 3205205 3150690 3151648 DESCRIPTION CAP AXIAL 001 10 5 CAP AXIAL 001 10 CAP AXIAL 001 10 CAP AX 10 MF 50V CAP AXIAL 001 1096 CAP ELECTRO 22025 20 CAP AXIAL 001 MF 10 Y5P CAP AXIAL 001 10 CAP AXIAL 470 PF 10 Y5P CAP AXIAL 33 0 PF 5 NPO CAP AXIAL 001 10 CAP AXIAL 33 0 PF 5 NPO CAP AXIAL 39 0 PF 5 NPO CAP AXIAL 001 MF 10 CAP AXIAL 12 0 PF 5 NPO CAP AXIAL 001 MF 10 CAP AXIAL 12 0 PF 5 NPO CAP ELECTRO 22 25 20 CAP AXIAL 33 0 PF 5 NPO CAP AXIAL 01 20 CAP AXIAL 6 8 PF 10 NPO CAP AXIAL 001 MF 10 CAP AXIAL 470 PF 10 CAP AXIAL 01 20 CAP AXIAL 150 PF 10 CAP AXIAL 47 0 PF 5 N750 CAP AXIAL 01 20 YSP CAP ELECTRO 22 25 20 CAP AX 10 MF 50V CAP AXIAL 150 PF 10 YSP CAP AXIAL 01 MF 20 CAP AX 10 MF 50V CAP AXIAL 01 MF 20 YSP CAP AXIAL 120 PF 596 GP CAP AX 10 MF 50V CAP AXIAL 001 MF 10 Y5P CAP ELECTRO 22925 20 CAP AXIAL 68 0 PF 5 NPO CAP AXIAL 39 0 PF 5 NPO CAP AXIAL 33 0 PF 5 NPO CAP AXIAL 68 0 PF 5 NPO
103. 5 DESCRIPTION CAP 10 MF 50V CAP 10 MF 50V CAP AX 10 MF 50V CAP CHIP O1UF 60V 8MM CAP CHIP O1UF 60V 8MM CAP CHIP 01UF 60V 8MM CAP CHIP 01VL 60V 8MM CAP CHIP O1UF 60V 8MM CAP CHIP O1UF 60V 8MM CAP CHIP O1UF 60V 8MM CAP CHIP O1UF 60V 8MM CAP AXIAL 001 MF 10 CAP AXIAL 56 pF 5 NPO DIODE 1N4148 DIODE 1N4148 DIODE 1N4148 DIODE 1N4148 DIODE 1N4099 6 8V 5 25W DIODE 152186 DIODE 152186 DIODE 182186 DIODE 182186 VARACTOR ITT310 VARACTOR ITT310 VARACTOR ITT310 VARACTOR ITT310 DIODE 1N4148 DIODE 15597 2 04973 7 DIODE 18597 2 04973 7 DIODE 1N4148 DIODE 209 15 101 VARACTOR 1522088 VARACTOR 1522088 VARACTOR 1522088 VARACTOR 1822088 DIODE 15597 2 04973 7 DIODE 18597 2 04973 7 DIODE 18397 2 ND4973 7E DIODE 15597 2 04973 7 DIODE 15597 2 04973 7 DIODE 1N4005 PLASTIC DIODE 1N4740A 10V 5 1W DIODE 18597 2 04973 7 DIODE 1N5228B 3 9V 5 SW DIODE 1N4734A 5 6V 5 TW DIODE 1N4734A 5 6V 5 1W DIODE 1N4734A 5 6V 5 TW CONN COAX PC MT 90 DEG CONN P C 8 PIN FEMALE CONN P C 8 PIN FEMALE CONN P C 8 PIN FEMALE CONN RT ANG DB9 CONN COAX PC MT 90 DEG CONN COAX PC MT 90 DEG CONN COAX PC MT 90 DEG COILRADIAL 5 6 UH COIL RADIAL 5 6 UH RADIAL 5 6 UH COIL RADIAL 5 6 UH COIL RADIAL 5 6 UH COIL RADIAL 0 27 UH COIL AXIAL 0 15 UH L153 L158 P100 101 102 103 104 PART NUM 3524215 3524118 3524165 3524118 3524165 35241
104. 5 X o i LAMPS BRIGHT 2 0V0C ir 1 ORE 4 mM L 1 UNIT OFF 1 26 201055 UNIT OFF 1 9V0C i 1 B 2404 52 LEDs I NS XS i Lamps 0 7V0C LI I L L i I I I _Lensos caase mom sung DIM ii 1 ovoc unit EVEN 1 oval 0 7 0 1 50400 10 CA104 it g 036 OFF ovee LOSE Ten Tas R UN LAMPS BAIGHT OVDC 9101 Wi 7 DIM 3 _ 2N3804 OFF 9786 LAMPS BRIGHT 2 0VDC 100K DIM 4 8 0 OFF 0 UNIT OFF OVDC CONTROLLER Lco uP7225 CONTROLLER 2 CONV DRE ATTN OFF SLOH Past dee 0 6 2 3 t 0 4 0 LSB cH ATTY AM FM n 1 2 ANT RF BH KHZ MODE 3 A B NB TIMER NOTCH STEP LOCK 5 E 2 E 5 1 7A THIS DOCUMENT CONTAINS INFORMATION WHICH 18 CONFIDENTIAL AND PROPAIETARY ANO IT IS NOT Kar COPIED OR REPRODUCED IN WHOLE OR IN PART DISCLOSEO TO OTHERS Pa THE EXPRESSED WAITTEN PERMISSION L DRAKE COMPANY COPYRIGHT 1951 L n 5 met 3 is Front Panel Board Pictorial 54 D 8128 POPE Do bos I
105. 5 SW DIODE 15997 2 04973 7 DIODE 1N4148 DIODE 1N751A 5 1V 5 5W DIODE 1N4148 DIODE 1N4148 DIODE 1N4148 DIODE 1N4148 DIODE 1N4148 DIODE 15997 2 04973 7 DIODE 1N4148 DIODE 1N4005 PLASTIC DIODE 1N4148 DIODE 1N4148 L109 L110 L111 L112 L113 P100 P101 P102 P103 P105 P106 P107 P108 P109 P110 P111 P112 P113 Q101 Q102 Q103 Q104 Q105 Q106 Q107 Q108 Q109 Q110 Q112 Q113 PART NUM 2150019 3281025 3281695 3281695 3281695 3281505 3280042 3280746 3280746 3280746 3280043 2055127 3524114 3524241 2055127 3520590 2055127 3524241 2055127 2055127 2055127 3520590 2055127 2055127 3524241 3280723 3280723 3280723 3280723 3290752 3280723 3280723 3280723 3290752 3280723 3280723 3280723 3280720 3030104 3030104 3030104 3030104 3030104 3030495 3030292 3030104 3030104 3030286 3030286 3030104 3030104 3030104 DESCRIPTION HT SINK 5073B TDA2003 ASSY JACK PHONE YKB21 5012 RECEPTACLE PHONO 1P PC MT RECEPTACLE PHONO 1P PC MT RECEPTACLE PHONO 1P PC MT RECEPTACLE DIN 5 PIN 90 DEG CONN 8 PIN FEMALE CONN 8 PIN FEMALE CONN 8 PIN FEMALE CONN COAX PC 45 DEG 9 5mH POT CORE ASSY 4560254 SHIELD COIL VAR 10 0 MH 1096 C11265 COIL RAD L 47 MH C7679 SCL 9 5mH POT CORE ASSY 4560254 SHIELD CHOKE ASSY 270 0 UH 9 5mH POT CORE ASSY 4560254 SHIELD COIL RAD L 47 MH C7679 SCL 9
106. 51155 3151155 3151515 3180109 3151065 3180012 3151648 3151648 3151648 3150896 3205228 3151648 3151648 3151515 3150595 3151259 3151040 3151040 3151515 3180109 3150595 3150896 3151515 3151117 3150845 3150845 3151515 3180109 3151405 3151405 3180064 3151515 3151405 3151405 3151425 3150030 DESCRIPTION CAP AX 10 MF 50V CAP AXIAL 220 PF 10 CAP FILM 001 100V 5 CAP FILM 001 100V 5 CAP AX 10 MF 50V CAP ELECTRO 22 25 20 CAP AXIAL 220 PF 10 CAP AXIAL 220 PF 10 CAP AXIAL 470 PF 10 Y5P CAP AXIAL 01 MF 20 CAP AXIAL 470 PF 10 YSP CAP AXIAL 470 PF 10 CAP AXIAL 01 MF 20 CAP ELECTRO 22 25 20 CAP AXIAL 150 PF 10 YSP CAP AX 10 MF 50V CAP AX 10 MF 50V CAP AXIAL 01 MF 20 CAP AXIAL 01 MF 20 CAP AXIAL 01 MF 2026 CAP AXIAL 330 PF 1096 CAP AXIAL 150 PF 1096 CAP AXIAL 150 PF 1096 YSP CAP AXIAL 01 MF 20 CAP ELECTRO 22025 20 CAP AXIAL 100 PF 5 GP CAPELECTRO 1050 20 CAP 10 MF 50V CAP AX 10 MF 50V CAP AX 10 MF 50V CAP AXIAL 56 0 PF 5 NPO CAP VAR TRIMMER 10 120 PF CAP AX 10 MF 50V CAP AX 10 MF 50V CAP AXIAL 01 MF 20 CAP AXIAL 22 0 PF 5 NPO CAP AXIAL 220 PF 10 YSP CAP AXIAL 82 0 PF 5 N750 CAP AXIAL 82 0 PF 5 N750 CAP AXIAL 01 MF 20 CAPELECTRO 22025 2095 CAP AXIAL 22 0 PF 595 NPO CAP AXIAL 56 0 PF 5 NPO CAP AXIAL 01 MF 2096 CAP AXIAL 120 PF 5 GP CAP AXIAL 47 0 PF
107. 60664 DESCRIPTION RES C FILM 5 6K 5 1 4W CAP CHIP 12 NPO 0805 RES FILM 4 7K 5 1 4W RES FILM 4 7M 5 1 4W DIODE SILICON INDUCTOR TOROID RLD DWG B4007 46 COIL VAR 0 804H 7MM RLD DWG 8048 4 COIL VAR 0 804H 7MM RLD DWG B8048 4 CAP VAR TRIMMER CAP CHIP 9pF NPO 0805 CAP CHIP 9pF NPO 0805 CAP AXIAL 001MF 10 RES C FILM 10K 596 1 4W RES C FILM 1 MEG 596 1 4W CAP CHIP 2 2pF 50V 0805 CAP CHIP 2 2pF 50V 0805 RES C FILM 270 596 1 4W TRANSISTOR DUAL GATE MOSFET 35 81 CAP AXIAL 20 SHIELD POT CORE RLD DWG B8297 RES C FILM 220K 5 1 4W RES C FILM 820 5 1 4W RES FILM 680K 5 1 4W RES FILM 100K 5 1 4W CAP AXIAL 220Pf 10 CAP AXIAL 001MF 10 CAP AXIAL 91pF 2 NPO RES C FILM 5 1K 5 1 4W RES C FILM 2 2K 5 1 4W RES FILM 120K 5 1 4W RES FILM 100K 5 1 4W CAP AXIAL 68pF 2 NPO RES FILM 220 OHM 5 1 4W RES FILM 220 OHM 5 1 4W CAP AXIAL 59 5 NPO RES FILM 10k 5 1 4W I C 27256 PROM W VERSION 12 R8 SOFTWARE RES VAR PT 10V 10K SAFETY INSTRUCTIONS SAFETY PRECAUTION WARNING Service should not be attempted by anyone unfamiliar with the necessary precautions on this unit The following are the necessary precautions to be ob served before servicing this chassis 1 When replacing a chassis in the cabinet always be certain that all the protective devic
108. 62 andits accompanying circuitry U 100 is basically a complete narrowband FM receiver which provides recovered FM audio and an RSSI Received Signal Strength Indicator output both of which are sent to the 2nd IF Audio board After leaving 102 the 45 MHz IF enters the Image Reject Mixer circuit IRM The IRM provides protection from the unwanted image frequency as well as providing the 50 KHz 2nd IF frequency The IRM is composed of 4 circuit elements the 45 MHz 90 deg divider formed by L146 L147 L156 L157 C189 C190 C208 C188 C191 and R140 the 0 deg divider formed R160 R161 and R162 the 50 KHz 90 deg divider formed by L169 L170 L171 L172 C 232 C233 C234 C241 C242 and R165 2 double balanced mixers and 2 FRONT END BOARD PARTS LIST REF C100 C101 C102 C103 C104 C105 C106 C107 C108 C109 C110 112 C113 114 115 C116 C117 C118 C119 C121 C122 C123 C124 C125 C126 C127 C128 C129 C130 C131 C132 C133 C134 C135 C136 C137 C138 C139 C140 C14 C142 C143 C144 C146 C147 C148 C149 C150 C152 C153 C154 C155 C156 C157 C158 C159 PART NUM 3151648 3151259 3184019 3184019 3151648 3180109 3151259 3151259 3151345 3151515 3151345 3151345 3151515 3180109 3151155 3151648 3151648 3151515 3151515 3151515 3151295 31
109. 8 R319 R320 R321 R322 R323 R324 R325 R327 R328 R329 R330 R331 R332 R333 R334 R335 R336 R337 R338 R339 R340 R34 R342 R343 R344 R345 R346 R347 R348 R349 R350 R351 R352 R353 R354 R355 R356 R357 R358 R359 R360 R361 R362 R363 R364 R365 PART NUM 3220355 3220384 3220360 3220235 3220315 3220315 3220060 3220235 3220295 3220315 3220245 3220315 3220000 3220345 3220315 3220090 3220215 3220215 3220235 3220235 3220275 3220160 3260688 3220212 3220235 3220275 3220275 3220275 3220190 3220195 3220235 3220235 3260664 3220205 3220195 _ 3220240 3220357 3220315 3220200 3220235 3220235 3220190 3220315 3220140 3220090 3220315 3220090 3220140 3220235 3220200 3220315 3220315 3220320 3220370 3220345 3220065 3220040 3220335 3220355 3260668 3220245 3220230 DESCRIPTION RES C FILM 1 0 MEG 5 1 4W RES C FILM 12 MEG 10 1 4W RES C FILM 2 2 MEG 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 100 K 5 1 4W RES C FILM 100 K 5 1 4W RES C FILM 120 OHM 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 56K 5 1 4W RES C FILM 100 K 5 1 4W RES C FILM 15K 5 1 4W RES C FILM 100 K 5 1 4W RES M FILM 0 0 OHM 1 1 4W RES C FILM 470 K 5 1 4W RES C FILM 100 K 5 1 4W RES C FILM 330 OHM 5 1 4W RES C FILM 5 6 K 5 1 4W RES C FILM 5 6 5 1 4W RES 10K 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 33K 5 1 4W RES C FILM 1 0K 5 1 4W RES VAR LIN 2K RES C FILM 5 1 K 5 1 4W RES
110. 88 3uH vios 98190 1 117330 1 JL 1 8259 8 2 45 OSHHZ 1 138 601uF 82000 5 45 1 1 e338 1 8265 BET M AA 5 4 0 1 3563 Las I 1 L__ 3524116 4 7V0C 68103 1 i Ri g7 9405 Di 10K 330pF caza 304148 _ 25 0105 cat EET geek uad qe M150 47K 204 1 THIS OOCUMENT CONTAINS INFORMATION WHICH O1uF 1 10 15 CONFIOENTIAL AND PROPRIETARY AND IT IS JORHI gt 1 1231 NOT TO BE USED COPIED OR REPRODUCED IN L 3524528 WHOLE PART OH DISCLOSED TO OTHERS aa LOOP 3 3 3uH Azaz WITHOUT THE EXPRESSED WRITTEN PERMISSION 85 MIXER 10K DAAKE COMPANY COPYRIGHT e 1882 L DRAKE g napa cA za 1 54 1 4 15597 FM ENA gt L 9129 39pF 4107 45 OUT 2ND LO TO FRONT END i 1141 ZONH gt 3524104 cas c210 Loop 2 E 334 O iur HIXER TL 90 Synthesizer Microprocessor 44 Board Pictorial D 8137 3 4 5 6 2 8 3 10 11 I 12 13 34 15 16 I 18 19 20 21 22 23 24 25 2 SHIELDS P N 456 2266 SHIELD P N 456 826 0111
111. 96 5 CAP AXIAL 22 0 PF 5 NPO CAP AXIAL 56 0 PF 5 NPO CAP ELECTRO 10950 20 CAP AXIAL 22 0 PF 5 NPO CAP ELECTRO 1050 20 CAP AXIAL 39 0 PF 5 NPO CAP AXIAL 2 7 PF 10 GP CAP AXIAL 33 0 PF 5 NPO CAP ELECTRO 10050 20 CAP ELECTRO 1050 20 CAP AX 10 MF 50V CAP AXIAL 001 10 GAP AXIAL 001 MF 10 CAP ELECTRO 1050 20 CAP AXIAL 01 20 CAP AXIAL 10 0 PF 5 NPO CAP AXIAL 10 0 PF 5 NPO CAP AXIAL 4 7 PF 10 NPO CAP AXIAL 6 8 PF 10 NPO CAP AXIAL 4 7 PF 10 NPO CAP AXIAL 10 0 PF 5 NPO CAP AXIAL 15 0 PF 5 NPO CAP ELECTRO 22925 20 CAP AXIAL 8 2 PF 10 NPO CAP AXIAL 4 7 PF 10 NPO CAP AXIAL 001 10 5 CAP AX 10 MF 50V CAP AXIAL 001 10 CAP AXIAL 10 0 PF 5 NPO CAP AXIAL 8 2 PF 10 NPO CAP ELECTRO 22 25 20 CAP AXIAL 15 0 PF 5 NPO CAP AXIAL 10 0 PF 5 NPO CAP AXIAL 4 7 PF 10 NPO CAP AXIAL 6 8 PF 10 NPO CAP AXIAL 4 7 PF 10 NPO CAP AXIAL 10 0 PF 5 NPO CAP AXIAL 001 10 CAP DISC 33 0 PF 5 CAP DISC 330 PF 5 CAP AXIAL 10 0 PF 5 NPO CAP AXIAL 43 0 PF 5 NPO AXIAL 10 0 PF 5 NPO CAP AXIAL 01 MF 20 CAP AXIAL 001 MF 10 YSP CAP ELECTRO 22025 20 CAP ELECTRO 22 25 20 CAP AXIAL 01 20 CAP AXIAL 01 20 CAP AXIAL 01 MF 20 Y5P CAP FILM 1 100V 10 REF C281 C282 C283 C284 C285 C286 C287 C288 C289 C290 C291 C292 C293 C294 C295 C296 C297 C298 C299 C300 C301 C302 C303 C304 C305 C306
112. AR 7 1 2T 7M VIOLET 350 1055 SHIELD COIL VAR 7 1 2T 7M VIOLET 3501055 SHIELD COIL RADIAL 0 27 UH COIL VAR 0 19 UH COIL VAR SHLD COIL RADIAL 2 7 UH COIL RADIAL 5 6 UH COIL RADIAL 22 0 UH CONN 8 PIN MALE CONN P C 4 PIN MALE CONN 10 PIN MALE CONN P C 10 PIN MALE CONN 12 PIN MALE REF P105 P106 P107 P108 109 P110 Q100 Q101 Q102 Q103 Q104 Q105 Q106 Q107 Q108 Q109 Q110 q Q112 Q113 Q114 Q115 116 6117 Q118 Q119 Q120 Q121 Q122 Q123 Q124 Q125 Q126 Q127 Q128 Q129 Q130 Q131 Q132 Q133 Q134 Q135 Q136 Q137 Q138 Q139 Q140 Q14 Q142 Q143 Q144 6145 Q146 Q147 Q148 Q149 Q150 Q151 Q152 Q153 Q154 Q155 PART NUM 3280723 3280723 3280723 3280723 3280726 3280723 3030061 3030061 3030104 3030104 3030104 3030104 3030061 3030507 3030507 3030507 3030507 3030061 3030061 3030111 3030104 3030104 3030104 3030111 3030104 3030061 3030061 3030061 3030061 3030061 3030061 3030061 3030061 3030061 3030104 3030104 3030061 3030061 3030104 3030104 3030061 3030061 3030061 3030061 3030061 3030061 3030061 3030061 3030061 3030061 3030104 3030121 3030104 3030104 3030104 3030104 3030104 3030104 3030104 3030104 3030104 3030104 DESCRIPTION CONN P C 3 PIN MALE CONN P C 3 PIN MALE CONN P C 3 PIN MALE CONN P C 3 PIN MALE CONN P C 6 PIN MALE CONN P C 3 PIN MALE TRANSISTOR 2N3563 TRANSISTOR 2N3563 TRANSIS
113. C307 C308 C309 C310 C311 C312 C313 C314 C315 C316 C317 C318 C319 C320 C321 C322 C323 C324 C325 C326 C327 C328 C329 C330 C331 C332 C333 C334 C335 C336 C337 C338 C339 C340 C341 PART NUM 3184042 3151515 3151648 3151515 3184042 3184021 3151515 3151515 3151515 3180109 3180109 3151405 3151515 3150420 3150779 3150350 3150350 3150779 3150420 3180012 3180109 3151515 3151515 3151515 3151515 3151515 3180012 3180012 3150690 3150899 3150690 3151515 3151515 3151515 3180109 3151515 3151515 3151345 3150779 3151117 3150779 3151515 3180012 3151515 3151515 3151515 3180012 3151515 3180012 3180109 3151648 3151405 3151405 3151405 3151515 3151345 3151418 3151345 3151648 3151405 3151648 DESCRIPTION CAP FILM 022 100V 5 CAP AXIAL 01 20 CAP AX 10 MF 50V CAP AXIAL 01 20 CAP FILM 022 100V 5 CAP FILM 0047 50V 5 CAP AXIAL 01 MF 20 CAP AXIAL 01 MF 20 AXIAL 01 20 YSP CAP ELECTRO 22 25 20 CAP ELECTRO 22 25 20 CAP AXIAL 001 10 CAP AXIAL 01 20 CAP AXIAL 12 0 PF 5 NPO CAP AXIAL 43 0 PF 5 NPO CAP AXIAL 10 0 PF 5 NPO CAP AXIAL 10 0 PF 5 NPO CAP AXIAL 43 0 PF 5 NPO CAP AXIAL 12 0 PF 5 NPO CAP ELECTRO 1 50 20 CAP ELECTRO 22 25 20 CAP AXIAL 01 MF 20 YSP CAP AXIAL 01 MF 20 CAP AXIAL 01 MF 20 CAP AXIAL 01 MF 20 CAP AXIAL 01 20 CAP ELECTRO 1050
114. CAP AX 10 MF 50V CAP AXIAL 01 20 CAPELECTRO 22025 20 CAPELECTRO 1050 20 CAP ELECTRO 22 50 L LEAK CAP 10 MF 50V CAP ELECTRO 10008 16 RAD L 10 MF 50V AX 10 MF 50V CAP AXIAL 33 0 5 NPO CAP AXIAL 33 0 PF 5 NPO CAP AX 10 MF 50V CAP AX 10 MF SOV CAP AX 10 MF 50 CAP AX 10 MF 50V CAP AX 10 MF 50 CAP AX 10 MF 50V CAP AX 10 MF 50V CAP AX 10 MF 50V CAP VAR TRIM 3 3 20 5 PF CAP AXIAL 33 0 PF 5 NPO CAP AX 10 MF 50V REF C405 C406 C407 C409 C410 C411 C412 C413 C414 C415 C416 C417 C418 CR100 CR101 CR102 CR103 CR104 CR105 CR106 CR107 CR108 CR109 CRTIO CR111 CR112 CR113 CRI14 CR115 CR116 CR117 CR118 CR119 CR120 CR121 CR122 CR123 CR124 CR125 CR126 CR127 CR128 CR129 CR130 CR131 CR132 CR133 J100 J101 J102 J103 J104 J105 J106 J107 L100 L101 L102 L103 L104 L105 L106 PART NUM 3151648 3151648 3151648 3166105 3166105 3166105 3166105 3166105 3166105 3166105 3166105 3151405 3150896 3020090 3020090 3020090 3020090 3020088 3020335 3020335 3020335 3020335 3024711 3024711 3024711 3024711 3020090 3020401 3020401 3020090 3020278 3024700 3024700 3024700 3024700 3020401 3020401 3020401 3020401 3020401 3020220 3020120 3020401 3020156 3020110 3020110 3020110 3280042 3280746 3280746 3280746 3280756 3280042 3280042 3280042 3524165 3524165 3524165 3524165 3524165 3524138 352421
115. CAP AXIAL 001 MF 10 CAP 10 MF 50V CAP AX 10 MF 50V CAP AXIAL 001 10 CAP AXIAL 27 0 PF 596 NPO CAP AXIAL 68 0 PF 5 NPO CAP AXIAL 27 0 PF 5 NPO CAP AXIAL 0022MF 20 CAP AXIAL 68 0 PF 5 NPO CAP AXIAL 56 0 PF 5 NPO CAP AXIAL 39 0 PF 5 NPO CAP AXIAL 39 0 PF 595 NPO CAP AXIAL 001 MF 10 CAP AXIAL 001 MF 1096 YSP CAP AXIAL 001 MF 1096 CAP AXIAL 001 MF 10 CAP AXIAL 001 MF 1096 CAP AXIAL 001 MF 10 CAP AXIAL 0022MF 20 CAP AXIAL 001 MF 10 CAP AXIAL 001 MF 1096 CAP AXIAL 100 PF 596 GP CAP AXIAL 01 MF 20 CAP AXIAL 01 MF 20 CAP ELECTRO 22025 20 CAPELECTRO 1 50 20 CAP AXIAL 01 MF 20 YSP REF C160 C16 C162 C163 C164 C165 C166 C167 C168 C169 C170 C171 C172 C173 C174 C175 C176 C177 C178 C179 C180 181 182 C183 C184 C185 C186 C187 C188 C189 C190 C191 C192 C193 C194 C195 C196 C197 C198 C199 C200 C201 C202 C203 C204 C205 C206 C207 C208 C209 C210 C211 C212 C213 C214 C215 C216 C217 C218 PART NUM 3180012 3180012 3151515 3184068 3180152 3183011 3180109 3151515 3180152 3183011 3184068 3151065 3151515 3151065 3150350 3150779 3151515 3150040 3150078 3150115 3150030 3150040 3150040 3150350 3151405 3151065 3151405 3180295 3150030 3150779 3150030 3150779 3150350 3151515 3180012 3180109 3151515 3151515 3151515 3180012 3180012 315
116. CAP AXIAL 18 0 PF 595 NPO CAP AXIAL 10 0 PF 5 NPO CAP AXIAL 56 0 PF 5 NPO CAP AXIAL 001 MF 10 CAP AXIAL 680 PF 295 NPO CAP AXIAL 5 6 PF 10 NPO CAP RADIAL 220 PF 5 N470 CAP AXIAL 6 8 PF 10 NPO CAP AX 10 MF 50V CAP AX 10 MF 50V CAP AX 10 MF 50V CAP 10 MF 50V CAP ELECTRO 2 2050 CAP ELECTRO 10050 20 CAP AXIAL 12 0 PF 5 NPO CAP AXIAL 39 0 PF 5 NPO REF PART NUM 3150640 3150350 3151405 3151364 3151260 3151260 3150245 3151064 3150420 3150783 3150750 3150420 3150420 3150540 3150779 3150640 3180018 3151515 3151515 3180109 3180109 3180064 3180109 3180018 3151648 3180064 3150420 3150750 3150640 3150350 3151405 3151364 3150595 3151260 3150640 3150779 3150540 3150420 3150420 3150750 3150783 3150420 3151064 3151050 3151648 3180094 3151515 3180018 3151515 3151345 3151515 3180002 3180002 3151405 3151405 3180064 3180007 3180064 3151648 3151648 3151432 DESCRIPTION CAP AXIAL 27 0 PF 5 NPO CAP AXIAL 10 0 PF 5 NPO CAP AXIAL 001 MF 10 Y5P CAP AXIAL 680 PF 295 NPO CAP RADIAL 220 PF 5 N470 CAP RADIAL 220 PF 5 N470 CAP AXIAL 6 8 PF 10 NPO CAP AXIAL 100 PF 296 NPO CAP AXIAL 12 0 PF 596 NPO CAP AXIAL 51 0 PF 296 NPO CAP AXIAL 39 0 PF 5 NPO CAP AXIAL 12 0 PF 5 NPO CAP AXIAL 12 0 PF 5 NPO CAP AXIAL 18 0 PF 5 NPO CAP AXIAL 43 0 PF 595 NPO CAP AXIAL 27 0 PF 5 NPO CAP ELECTRO 2 2950 CAP AXIAL 01 MF 20 CAP AXIAL 01 2096 Y5P ELECTRO 220
117. CR106 CR107 CR108 CR109 CR110 CR111 CR112 CR113 CR114 CI2115 CR116 CR117 CR118 CR119 CR120 CR121 CR123 CR124 PART NUM 3151117 3151648 3151648 3151648 3151648 3151515 3180064 3184046 3184046 3184042 3151648 3180064 3151515 3151515 3180232 3151648 3184042 3184042 3151648 3151648 3151648 3151459 3151648 3151648 3151648 3151648 3180012 3151648 3151648 3151648 3151648 3151648 3151648 3167507 3140403 3140405 3020335 3020335 3020335 3020335 3020335 3020335 3020335 3020335 3020335 3020335 3020335 3020335 3020335 3020335 3020335 3020335 3020335 3020335 3020335 3020335 3020335 3020385 3020335 3020335 DESCRIPTION CAP AXIAL 120 PF 5 GP 10 MF 50V CAP 10 MF 50V CAP AX 10 MF 50V CAP AX 10 MF 50V CAP AXIAL 01 MF 2096 CAPELECTRO 10950 2096 CAP FILM 033 100V 5 CAP FILM 033 100 5 CAP FILM 022 100V 5 CAP AX 10 MF 50V CAPELECTRO 10950 20 CAP AXIAL 01 MF 2096 CAP AXIAL 01 MF 2096 CAP ELECTRO 330025 RADIAL CAP AX 10 MF 50V CAP FILM 022 100V 5 CAP FILM 022 Q 100 596 CAP AX 10 MF 50V CAP AX 10 MF 50V CAP AX 10 MF 50V CAP AX 0047MF 80 20 Z5U CAP AX 10 MF 50V CAP 10 MF 50V CAP AX 10 MF 50V CAP AX 10 MF 50V CAPELECTRO 1050 20 CAP AX 10 MF 50V CAP AX 10 MF 50V CAP AX 10 MF 50V CAP AX 10 MF 50V CAP 10 MF 50V CAP AX 10 MF 50V CAP CHIP 12pF NPO 0805 FILTER CER SFE 10 7MJZ FI
118. E EIE Qui cus Cm ci dee QoPT 8720 cin O_o 0 I 0 Oca N _ aces o 220 856 IO 982 e 6 5 30 035 20 n C122 4537 Listy RLIB1 RI75 10 Go 0 9 gun eS 5533 OMI ANT 1 IN E 924 Cs 138 ery C169 ci83 8 2 mom cri29 L 28 12 ei P e oo O O 14885 UE Die Rea E ARN SEO VHF CONV IM 35 0 198 oo EA AAN 9464 R178 R176 N A OZm O cigs C170 C184 RII 127 10 9 4 C113 82 L 15 12 8 Gm 0 OO 0 20 Or o OSTIO quse 9 50 0 wm 9 64 B T RE 4 0 y y uon 9 us cras Raut os Riot 8 See a SI al KO 91 y 1 C228 CHAO sel Lo 3289723 JOO CI25 22uF ORIS ORB 5 Okia ia R158 16 Y B 16 3288724 8 E OU wT O BIAL x O ses R179 2 THIS DOCUMENT CONTAINS INFORMATION HICH ok 00009 zur c s 22 cua
119. E EXPRESSED WAITTEN PERHISSION FUNCTION KEYPAD NUMERIC KEYPAD DISPLAY 80 gt OF R L DRAKE COMPANY 4 3 Front amp Rear Panel 1 O Theory of Operation The two front panel keypads are both part of one key matrix which is scanned by the controller every 25 msec Rows are scanned using U114 and column outputs are read from U113 Each key generates unique row column combination which is then read and acted on by the controller software The power on off key is not part of the scanned matrix and is read every 25 msec All keys are debounced in software The encoder wheel interface provides two oufput wave forms which are square waves 90 degrees out of phase When the wheelis turned the encoder Bline clocks a high into the output of 01008 which causes an interrupt U104 pin 6 When the controller services the interrupt the high is cleared by a momentary low to U100B pin 13 After clearing the high the controllerlooks atthe other encoder line onits T1 input pin 39 to determine which direction the wheel is being turned The frequency can then be up dated accordingly The display is a4 backplane LCD controlled by a 7225 driver The driver is serially loaded using 0104 pins 37 and 38 and contains the actual display memory The 111 display segments are partitioned into three groups and data for each group is updated once every 75 msec Controller U104 sets the LED backlight for the display by usin
120. ES C FILM 3 3 5 1 4W RES C FILM 33 K 5 1 4W RES C FILM 3 3 K 5 1 4W PART NUM 3220160 3220330 3220310 3260672 3220235 3220235 3220235 3220160 3220160 3220145 3220160 3220235 3220195 3220195 3220170 3220015 3220315 3220285 3220315 3220045 3220006 3220235 3220235 3220160 3220355 3220355 3220235 3260688 3220345 3220115 3220090 3220240 3220282 3220315 3220315 3220235 3220000 3220235 3220160 3220160 3220160 3220190 3220190 3220350 3220315 3220285 3260672 3220315 3220300 3220275 3220315 3220235 3220295 3220235 3220230 3220235 3220170 3220215 3220000 3220315 3220075 3220005 DESCRIPTION RES C FILM 1 0K 5 1 4W RES 220 5 1 4W RES 82K 5 1 4W RES VAR 50K RES C FILM 10K 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 1 0K 5 1 4W RES C FILM 1 0 K 5 1 4W RES C FILM 820 OHM 5 1 4W RES C FILM 1 0 K 596 1 4W RES C FILM 10K 5 1 4W RES C FILM 2 7 K 5 1 4W RES C FILM 2 7 5 1 4W RES C FILM 1 2 5 1 4W RES 22 OHM 5 1 4W RES C FILM 100 K 5 1 4W RES 47 5 1 4W RES C FILM 100 K 5 1 4W RES C FILM 68 OHM 5 1 4W RES C FILM 1 5 OHM 5 1 4W RES C FILM 10K 596 1 4W RES C FILM 10K 5 1 4W RES C FILM 1 0 K 5 1 4W RES C FILM 1 0 MEG 5 1 4W RES C FILM 1 0 MEG 5 1 4W RES C FILM 10K 5 1 4W RES VAR 2K RES 470 5 1 4W RES C FILM 510 OHM 5 1 4W RES C FILM 330 OHM 5 1 4W RES 12K 5 1 4W RES C FILM
121. ETARY AND IT IS NOT TO BE USED COPIED OR REPRODUCED IN HHOLE OR II PART OR DISCLOSED OTHERS WITHOUT THE EXPRESSED WRITTEN PERMISSION OF THE R L DRAKE COMPANY D 8137 NOTES enc RERL TIME CLOCK 2 0885885 9220580589 gt 2nd LO FREQ VCO 2nd LOOP 2nd LO OUTPUT 2 LO OUT 1 04 COMP SIDE SOLDER COAX P N 271 5645 BETWEEN REFERENCE SET 38 fDJUST FREQ ADJUST LEVEL ADJUST 45 95 MHZ POINTS A AND D SOLDER CORX P N 271 5643 BETWEEN 88 s nag 808880800895 5 52 gas COPYRIGHT 1991 R L DRAKE POINTS AND C SOLDER SHIELDS CORK TO GND AT 9 8 ERCH TERHINATION POINT H 2 SOLDER METAL SHIELDS TO COMP GND PLANE ALONG NL ENTIRE To ENCODER 3 C163 AND CI7B FRE JuF FILM P N 318 4068 TO FRONT PANEL DISPLAY BOARD RSSY _ 2 SHIELDS P N 456 8266 VCO 3rd LOOP FREQ ADJUST SHIELD P N 456 8267 e oq 59 ALT S RICO RIB2 278 GON ons RIAS 10 8 8T don Ges eo gus RIBS 128 OU ZO FAO Se VE ou 4 5 Ones iss Ist LO COUT dl 0 R168 Eel 0s ge sas GOW gusto
122. HM 5 1 4W RES C FILM 1 5 5 1 4W RES C FILM 2 2 K 5 1 4W RES C FILM 270 OHM 5 1 4W RES C FILM 390 OHM 5 1 4W RES C FILM 1 8K 5 1 4W RES C FILM 470 OHM 5 1 4W RES 5 1 4W RES C FILM 1 0 K 5 1 4W RES C FILM 120 OHM 5 1 4W REF R162 R163 R164 R165 R166 R167 R168 R169 R170 2171 R172 R173 R174 R175 R176 R177 R178 R179 R180 R181 R182 R183 6184 R185 R186 R187 R188 R189 R190 R191 R192 R193 R194 R195 R196 R197 R198 R199 R200 R201 R203 R204 R205 R206 R207 R208 R209 R210 R211 R212 R213 R214 R215 R216 R217 R218 R219 R220 2221 R222 R223 PART NUM 3220125 3220100 3220055 3220190 3220175 3220085 3220235 3220235 3220085 3220005 3220005 3220085 3220070 3220055 3220070 3220215 3220145 3220160 3220060 3220195 3220235 3220140 3220055 3220055 3220045 3220055 3220055 3220315 3220110 3220180 3220180 3220110 3220055 3220315 3220055 3220235 3220230 3220300 3220285 3220315 3220110 3220110 3220130 3220110 3220240 3220235 3220315 3220260 3220260 3220315 3220235 3220240 3220110 3220130 3220215 3220085 3220245 3220055 3220055 3220315 3220110 3220055 DESCRIPTION RES C FILM 560 OHM 5 1 4 RES C FILM 390 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 2 2 K 5 1 4W RES 1 5 5 1 4W RES C FILM 270 OHM 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 270 OHM 5 1 4W RES C FILM 10 OHM 5 1 4W RES C
123. LTER CERAMIC CFU455E 2 DIODE 152186 DIODE 182186 DIODE 152186 DIODE 152186 DIODE 152186 DIODE 182186 DIODE 152186 DIODE 182186 DIODE 182186 DIODE 152186 DIODE 152186 DIODE 152186 DIODE 152186 DIODE 152186 DIODE 152186 DIODE 152186 DIODE 152186 DIODE 152186 DIODE 152186 DIODE 152186 DIODE 182186 DIODE 182186 DIODE 182186 DIODE 152186 REF CR125 CR126 CR127 CR128 CR129 CR130 FL101 J100 J101 J102 J103 J104 J105 L100 L101 L102 L103 L104 L105 L106 L107 L108 L109 L110 L111 L112 L113 L114 L115 L116 L117 L118 L119 L120 L121 L122 L123 L124 L125 L126 L127 L128 L129 L133 L134 L135 L136 L137 L138 L139 L140 L141 L142 L143 L144 L145 L146 L147 PART NUM 3020335 3020335 3020220 3020220 3020220 3020220 3140411 3280042 3280042 3280042 3280042 3280042 3301253 3524199 3524193 3524196 3524193 3524199 3524196 3524186 3524188 35241 86 3524196 3524205 3524515 3524188 3524185 3524176 3524185 3524188 3524185 3524178 3524173 3524178 3524185 3524177 3524172 3524170 3524172 3524177 3524165 2510082 3524165 3524171 3524173 3524160 3524173 3524171 2510103 3524164 2510104 3524168 3524171 3524155 3524171 3524168 2510083 2510083 DESCRIPTION DIODE 152186 DIODE 152186 DIODE 1N4005 PLASTIC DIODE 1N4005 PLASTIC DIODE 1N4005 PLASTIC DIODE 1N4005 PLASTIC FILT CER RMC 2A6597HM CONN COAX PC MT 90 DEG
124. LY casa 9319 CR130 Ch137 E 10K 1 10v R310 A290 R222 1M m C193 JI 2M4125 R900 IN U S CAN UNITS ONLY REHOVE FOR 220 240 Vac OPERATION IN EUROPE 2150 321 10K 9323 CR125 1N4148 Board Schematic D 8212 Note This drawing applies to R8 R8E units with serial S N numbers after 11100001 November 1991 2nd IF Audio Power Supply 27 1 1 E TVM HIN AESTSTANCE BETWEEN POINT A AND CHASSIS GNO 2 5 BETWEEN POINT 8 AND CHASSIS GNO OHMS BETWEEN POINT C AND CHASSIS GND BK OHMS PARTS WITHIN DOTTED LINE ARE CRITICAL WARNING ELECTAIC SHOCK EXT DC INPUT 42 C 122 1N4005 1 1 1 1 1 1 1 1 i i l t 1 1 i t 4 gt 6 C497 10V FUSE 6272 T400mA 300 320 1 4005 T200mA 2
125. MHz LPF after U128 filters off the undesired mixing products and Q132 provides enough gain to ensure U125 sees atleast a 1 volt PTP signal at Pin 8 U125 must divide the 4 999 4 900 MHz VCO signal down to 1 KHz for the internal phase comparison This division ratio N3 is calculated by the uP andloadedinto 0125 N3 will be an integer number within the following limits 4900 lt 3 lt 4999 Returning to the VCO3 output and Q122 after Q122 the VCO3 output is divided by 10 af 0122 The output of U122 at Pin 4 is considered the output The PLL3 output signal covers the range from 6 5001 MHz to 6 5100 MHz in 100 Hz steps and is used by the middle loop PLL2 10 lock the middle loop The frequency relationships of PLL3 are given by the follow ing equations Let free 35 MHz reference signal f vc 2X fag fau 10 X 1 R3 X N3 f 2 N3 35000 10 10 2 N3 35000 MIDDLE LOOP PLL2 PLL2 is similar to PLL3 but provides the medium step size and resolution main component is 0126 MC 145157 0126 isidentical to U125 in PLL3 and consists of 2 programmable dividers and a phase comparator The programmable dividers are programmed by the uP through the serial data bus Thereference signal at Pin 1is divided by R2 The VCO signal at Pin 8 is divided R2 like R3 is constant and the uP loads R2 only during the power on sequence N2 like N3 is variable and needs t
126. NEL ANT T INPUL SHIELD 3711168 6 CONDUCTOR CABLE ROUTE FIGURES R8 TOP VIEW 10 Identify the 8 Coaxial Cable 3711160 Plug in one end of the cable to the IF IN terminal on the Front End board assembly and plug the other end into the OUT terminal of the VHF Converter assembly The VHF Converter electrical installation is com plete at this point Prior to applying AC power fo the R8 receiver for testing proceed as follows 11 Position the R8 with the bottom of the unit facing up front panel toward you Place the bottom cover on the unit oriented with the lever feet toward the front panel of the R8 Secure the bottom cover using 6 4 40 x 1 4 Pan Head Philips screws that were removed in step 2 NOTE You may wish to secure the bottom cover with 2 screws until after unit system check but note that AC power Is active at all times in the R8 whenever it is connected to a source of AC power 12 Position the R8 with the top of the unit facing up front panel towards you Install the top cover using the 5 6 32 x 1 4 Pan Head Philips BLACK screws retained in step 1 UNIT SYSTEM CHECK 13 Connect the R8 to a source of AC power Press the POWER button to place the R8 in the ON mode The unit should automatically switch to the converter antenna input if any frequency in the range of either 35 55 MHz or 108 174 MHz is selected If the above action d
127. OHM 5 1 4W RES C FILM 22 OHM 5 1 4W RES C FILM 220 OHM 5 1 4W RES C FILM 2 2 K 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 220 OHM 5 1 8W RES C FILM 220 OHM 5 1 8W RES C FILM 22 OHM 5 1 8W RES C FILM 4 7 K 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 620 OHM 5 1 4W RES C FILM 4 7 K 5 1 4W RES C FILM 200 OHM 5 1 4W RES C FILM 68K 5 1 4W RES C FILM 10K 5 1 4W RES C FILM 2 7 K 5 1 4W RES C FILM 4 7 5 1 4W RES C FILM 2 7 K 5 1 4W RES C FILM 4 7 K 5 1 4W RES 22K 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 22 5 1 4W RES 22K 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES 22K 5 1 4W RES C FILM 200 OHM 5 1 4W RES C FILM 430 OHM 5 1 4W RES C FILM 430 OHM 5 1 4W RES C FILM 68 5 1 4W RES C FILM 430 OHM 5 1 4W RES C FILM 430 OHM 5 1 4 RES C FILM 150 OHM 5 1 8W RSE C FILM 150 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RSE C FILM 150 OHM 5 1 4 RES C FILM 620 OHM 5 1 4W RES C FILM 150 OHM 5 1 8W RES C FILM 39 OHM 5 1 8W RSE C FILM 150 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RES C FILM 100 OHM 5 1 4W RSE C FILM 150 OHM 5 1 4W REF 1101 1102 1103 1104 1105 1106 1107 1108 1109 III0 U101 U102 U103 U104 U105 U106 CI2101 CR102 CR103 CR104 CR105 CR106 CR107 CR108 CR109 CR110 CR111 CR112 CR113 CR114 CR115 CR116 CR117 CR118 CR119 CR120 CR121 CR122 CR123 CR124 CR125 MX101 RP100 VR101 VR102 PART NUM
128. PROPRIETARY AND IT IS NOT TO BE USED COPIED OR REPRO 2 IN WHOLE OR IN PPRT OR DISCLOSED TO S OTHERS WITHOUT THE EXPRESSED WRITTEN 568 25 rc P PERMISSION OF THE R L DRAKE COMPANY 88 T 88 COPYRIGHT 1991 R L DRAKE d SQUELCH VOLU E TO CONT CONTROL HEADSET RCK NOTES u 1 0162 2N5482 2030200 MAY BE REPLACED WITH 2N5953 3030201 BUT BODY ROTATION WILL BE DIFFERENT SEE CHART AT RIGHT FOR MORE INFORMATION HAH C149 AND C150 MUST BE 2 PARTS RS NOTED ZONE M 14 TOP VIEH 11425 6509 3 2 E 2 on 8 9 9 65 55 N Ds 3 95 22 is 29 2 2 o z gt 8 6 5 C N S 5 9 Q 8 12 18 19 28 21 22 23 24 25 13 I4 I 15 1 16 LINE LINE EXT AUDIO AUDIO 11 12 BIN CONN 18 TO FRONT END PCB BLANKING THRES 58 KHZ IN FROM MIXER 9338 MA 91 11 3 CINTIA 5 ENS MM RGCl SET AGC2 SET e 0580 606609 ol eus r gi o 5 gt Oxo Y IC 56 IS COPYRIGHT 1991 6 DRAKE Co IS NOT TO BE USED COPIED OR REPRODUCED IN HHOLE OR IN PART OR DISCLOSED TO OTHERS WITHOUT THE EXPRESSED WRITTEN PERMISSION OF THE R L DRAKE COMPANY
129. R8 R6E Communications Receiver Service Manual Copyright 1992 R Drake Company DOM 3850012B 6 1992 Printed in the U S A This second printing of the R8 R8E Service manual contains updates to the following assemblies as noted Akeypadswitch matrix diagram is also added page 52 PART NUM REF 1 FRONT END BOARD ADDITIONS R184 5 6K C258 12pF CHIP DELETIONS R134 4 7K R155 4 7M CR122 1N4148 L130 L131 L132 C160 4 20pF C163 9pF CHIP C165 9pF CHIP C161 001V CHANGES 2143 WAS 6 8K R135 1M WAS 100 L138 L140 C162 22pF WAS 3 9pF C164 2 2pF WAS 3 9pF R173 270 WAS 390 Q102 35 81 WAS 3N204 2 2ND IF AUDIO BOARD ADDITIONS C361 1 SHIELD R384 R385 R386 R387 C359 C360 DELETIONS C291 91pF CHANGES R327 5 1K WAS 6 8K R345 2 2K WAS 3 3K R375 120K WAS 180 R387 100K WAS 150K C257 68pF WAS 100pF 3 SYNTHESIZER BOARD ADDITIONS R405 220 R406 220 C418 56pF NPO DELETIONS R407 10K CHANGES U106 VERSION 12 SOFTWARE R348 WAS 20K 3220215 3167507 3220210 3220370 3220090 2510082 3524119 3524119 3205207 3166144 3166144 3151405 3220235 3220355 2510103 WAS 2510082 2510104 WAS 2510022 3166136 3166136 3220085 3030286 3151515 4560254 3220330 3220145 3220350 3220315 3151259 3151405 3151050 3220212 3220190 3220317 3220315 3150900 3220075 3220075 3150896 3220235 4671318 32
130. S C FILM 3 9 K 5 1 4W RES C FILM 68 OHM 5261 4W RES C FILM 68 OHM 5 1 4W RES 10K 5 1 4W RES C FILM 10K 5 1 4W RES 10 MEG 10 1 4W RES C FILM 22 5 1 4W RES 22K 5 1 4W RES C FILM 22 5 1 4W RES 22 5 1 4W RES 33K 5 1 4W RES C FILM 22 K 5 1 4W RES 10K 5 1 4W REF R239 R240 R241 R242 R243 R244 R245 R247 R248 R249 R250 R251 R252 R253 R254 R255 R256 R257 R258 R259 R260 R261 R262 R263 R264 R265 R266 R267 R268 R269 R270 R272 R273 R274 R275 R276 R277 R278 R280 R281 R282 R283 R284 R285 R286 R287 R288 R289 R290 R291 R292 R293 R294 R295 R296 R297 R298 R299 R300 R302 PART NUM 3220275 3220260 3220235 3220235 3220260 3220275 3220005 3220235 3220235 3220355 3220210 3220235 3220235 3220275 3220235 3220235 3220380 3220260 3220260 3220260 3220260 3220235 3220260 3220275 3220275 3220260 3220235 3220275 3220260 3220235 3220235 3220380 3220260 3220260 3220260 3220260 3220245 3220275 3220255 3220340 3220160 3220235 3220235 3220090 3260664 3220315 3220315 3220275 3220315 3220235 3220380 3220260 3220260 3220260 3220260 3220275 3220245 3220235 3220235 3220295 3220365 DESCRIPTION RES C FILM RES C FILM RES C FILM RES C FILM RES C FILM RES C FILM RES C FILM RES C FILM RES C FILM 33K 5 1 4W 22K 5 1 4W 5 1 4W 5 1 4W 22K 5 1 4W 33 K 5 1 4W 10 OHM 5 1 4W
131. S WITHIN NES SA 8384 0450 8382 400K 9900 IN WITH RESPECT ES iov C325 83 ware Ano T Dior 2 ac 2 ser i 1 ELECTRIC ken REMOVE FOR 2 2ur 220 240 VAC EXT DC INPUT 68126 1N4348 8900 4 7M 2M c272 FUSE CR121 1 2M 1400 30 20V C sour 200 220V 6 294005 SELECT 4 x mago 1 1 1 1 1 1 l 1 1 t 1 1 4 1 LI CR109 TO AGC AKP k 89107 10V 1 P105 1 D C200 t Ch105 t C142 t 1 1 1 1 i t 1 1 1 1 1 D I 1 1 1 i m A224 el ET C178 2 9UF Ci43 0022uF 100v Eur bos Y HERMAL CIRCUIT SAEAKEA J10B PIN 2 IH 5 FILTER 1 RELAY ACL Gaps IN 6100 R208 In FILTER SECTIONS cene B AN D p A S S FILTER 2 ET nessa NOTE i amc ane 2 UNLESS OTHERWISE ALL NPN S 2M3904 ALL CAPS IN PICOFARADS IN FILTER BECTION R235 naa a L J a 11 18V 4104 AY 83730 SPOT ul N N FROM 2106 PIN 3 FROH J107 FROH J107 2138 A103 9104 8105
132. SCRIPTION CAP ELECTRO 47 16 RADIAL CAP RAD 10 MF SOV CAP RAD 10 MF SOV CAP RAD 10 MF 50V CAP RAD 10 MF 50V CAP ELECTRO 47 16 RADIAL CAP 047 80 20 250 CAP DISC 680 10 50V CAP RAD 10 MF 50V CAP RAD 10 MF 50V CAP DISC OO1 22 250 50V CAP AXIAL 01 MF 20 YSP CAP ELECTRO 47016 RADIAL CAP RAD 10 MF 50V CAP DISC 27 0 5 NPO 50V CAP RAD 10 MF 50V CAP DISC 20 0 5 NPO SOV CAP RAD 10 MF 50V CAP DISC 18 0 5 NPO 50V CAP RAD 10 MF 50V CAP DISC 10 0 596 NPO 50V CAP DISC 22 0 5 NPO 50V CAP DISC 27 0 5 NPO SOV CAP DISC 18 0 5 NPO 50V CAP DISC 15 0 5 50V CAP DISC 12 0 5 50V CAP DISC 10 0 5 NPO 50V CAP DISC 8 2 5 NPO 50V CAP DISC 10 0 5 NPO 50V CAP DISC 2 7 5 NPO SOV CAP DISC 10 0 5 NPO 50V CAP 2 7 5 NPO 50V CAP DISC 6 8 5 NPO 50V CAP ELECTRO 47 16 RADIAL CAP DISC 10 0 5 NPO 50V CAP RAD 10 MF 50V CAP DISC 10 0 5 NPO 50V CAP RAD 10 MF 50V CAP DISC 10 0 5 NPO SOV CAP RAD 10 MF 50V CAP DISC 10 0 5 NPO 50V CAP RAD 10 MF 50V CAP RAD 10 MF 50V CAP DISC 680 10 50V CAP RAD 10 MF 50V CAP DISC 47 0 5 NPO 50V CAP AXIAL 01 MF 2096 CAP DISC 150 1096 50V CAP DISC 001 22 250 50V CAP DISC 20 0 5 NPO SOV CAP DISC 20 0 5 NPO 50V CAP RAD 10 MF 50V CAP DISC OO1 22 250 50V CAP DISC 47 0 5 NPO SOV CAP DISC 001 22 Z5U SOV CAP RAD 10 MF 50V CAP RAD 10 MF 50 CAP DISC 120 10 YSP SOV CAP DISC 47 0 5 NPO 50V CAP RAD 1
133. T SQUEL 10K 10K R3 3260007 RES VAR TONE NOTCH 100K R4 3220055 RES C FILM 100 OHM 5 1 4W RS 3220055 RES C FILM 100 OHM 5 1 4W R6 3220075 RES C FILM 220 OHM 5 1 4W R7 3220215 RES C FILM 5 6 K 5 1 4W R90 3250409 RES COMP 4 7 MEG 1096 1 2W 1 3670550 SW VOLT SELECT J R1025 01 SPKI 3640035 SPEAKER 4 OHM C100K22MO111 LI 3690388 POWER XFMR R8 MISCELLANEOUS CHASSIS PARTS PART NUMBER 3372503 3390009 3450001 3450002 3450003 3473200 3474200 3476001 3712007 3851290 4440595 4445109 4807518 4807550 DESCRIPTION JUMPER 2 CIRCUIT SHUNT FOOT SET KNOB TUNING KNOB SMALL BOTTOM KNOB SMALL TOP TAPERED LENS DIFFUSER LCD LGT REFLECTOR LGHT HOUSING HOUSING BOX LCD LIGHT HALF CORD LINE 18 2 76 OWNER S MANUAL REAR PANEL SCREENED SCREENED FRONT PANEL COVER TOP BLK VINYL COVER BOTTOM Pd FM DETECTOR ANTENNA SWITCH OHH 7 1 50 OHM NOISE ANT 2 BLANKER ATTENUATOR Receiver Block Diagram PREAMP 8 METER 8 METER MASTER LOW PASS DRIVER HIXER FA AGC AHPLIFIER AGC DETECTOR LINE AUDIO our AF GAIN CONTROL IRM 1 1 50 KHz FILTER 4 AM SSB AUDIO 4 POLE OETECTOR TONE NOTCH SQUELCH GATE AMPLIFIER SWITCH IF 1 90 DEG Dans 0 DES 80 DEG DIVIDER DIVIDER COHBINER 45 MHz IF
134. TAR 2 J 22k 22 11 16V 9194 Gees R373 SPOT RELAY NC 8259 100 ji 22K i 16K U100B iouF K u usos FROM 2107 HPSAS3 FROM J107 3v 1 343 0V06 p 7 7 1 C344 i 5 5 5 LPF 29197 RIAS 3 13 3 axes 0153 IL 100K ae 1 8104 R105 4 L Fi LR 11 3 33K 33K 203904 ES i tine 835 AUDIO MARS gt E 1 H SOKHZ C407 i SYNC RONOUS 5V 5 5V TONE NOTCH 0047uF Cios DET 8 assy miss 2 2V0C oy 6 37 22vF 8587 T C157 Aisa EM SEE 1 6106 203904 O1UF 2 2K 8156 48Vpp 29033 350 N 1 100K sov SYDc 1 NOTCH DEPTH 330 V 2 _ 109 C128 8178 C149 _ Tori A ES 2 2uF 2 2uF UM asia 0033uF 100pF 3 _ 9105 eee NN 3270 8212 J100 12 4vop 100K 9140 4 243904 164 SPEAKER 100K INT SOTH EXT u 01 08 08105 ioi cimo 1N41 48 5 202 BkHz H CENTER 2303 MUST LET FREQ 100K m STABALIZE Rees gt 10K i 8148 P101 re FROM FRONT PANEL 5 Q U E L H 148 fon 3 n PBT POT WIPER _ 0 OHM 110 FROM J106 9112 PIN 5 on HIGH NOTCH OFF i
135. TOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3563 TRANSISTOR 28K 192 TRANSISTOR 25 192 TRANSISTOR 254192 TRANSISTOR 25 192 TRANSISTOR 2N3563 TRANSISTOR 2N3563 TRANSISTOR 2N4125 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 233904 _ TRANSISTOR 2N4125 TRANSISTOR 2N3904 TRANSISTOR 2N3563 TRANSISTOR 2N3563 TRANSISTOR 2N3563 TRANSISTOR 2N3563 TRANSISTOR 2N3563 TRANSISTOR 2N3563 TRANSISTOR 2N3563 TRANSISTOR 2N3563 TRANSISTOR 2N3563 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3563 TRANSISTOR 2N3563 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3563 TRANSISTOR 2N3563 TRANSISTOR 2N3563 TRANSISTOR 2N3563 TRANSISTOR 2N3563 TRANSISTOR 2N3563 TRANSISTOR 2N3563 TRANSISTOR 2N3563 TRANSISTOR 2N3563 TRANSISTOR 2N3563 TRANSISTOR 2N3904 TRANSISTOR 2N4402 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 PART NUM 3220015 3220245 3220085 3220235 3220235 3220055 3220065 3220035 3220285 3220210 3220285 3220210 3220285 3220210 3220285 3220235 3220235 3220070 3220055 3220055 3220055 3220235 3220110 3220110 3220110 3220110 3220055 3220235 3220320 3220320 3220320 3220320 3220320 3220320 3220320 3220320 3220160 3220060 3220235 3220055 3220055 3220235 3220160 3220160 3220160 3220160 3220015 3220115 3220055 3220
136. UTPUT 0115 Dee 0104 EEPROM MICRO CONTROLLER 0106 ROM U14107 ADDRESS LATCH CONTROL TO SYNTHESIZERS 2 M CLK DATA 4 FILTER SELECT E p nado SIRENS 0112 BUS DATA BUS ENCODER WHEEL PANEL Jw 1 2 3 5 6 7 101 1411 121 137 14 451 161 177 18 191 201 211 221 231 24 251 561 Microprocessor Circuits 4g ER Schematic D 8213 35597 C cage 9 45V0 888ur gt ER Pr m E 35 Lets gt 9146 CLCO 675 S DATA gt 3 MX EfaoBE gt 293904 i 5 0314 8335 74HC273 390 E a omi 82 SYNTH E BS 5 lt ZRESET A353 R354 TC8521AP 4 z A REAL TIME 25 CLOCK NONVOLAT ILE m MEMORY id POWER FAIL DETECTOR 5v 9103 RICOH 3 RESVA Bak 4 5 AX CONN 3 TO IF 103 860 OH gt o INTERFACE 003 APIO caas 22uF cA127 4M4005 M OJDAA WNA u 259100 CONN TO
137. XIAL 001 MF 1096 Y5P CAP AX 10 MF 50V CAP AXIAL 91 0 PF 296 NPO CAP AXIAL 001 MF 1096 Y5P CAP AXIAL 001 MF 1096 Y5P CAP AXIAL 680 PF 295 NPO CAP AXIAL 100 PF 295 NPO CAP AXIAL 12 0 PF 595 NPO CAP AXIAL 51 0 PF 295 NPO CAP AXIAL 39 0 PF 5 NPO CAP AXIAL 12 0 PF 5 NPO CAP AXIAL 12 0 PF 5 NPO CAP AXIAL 18 0 PF 5 NPO CAP AXIAL 43 0 PF 5 NPO CAP AXIAL 27 0 PF 5 NPO CAP AXIAL 001 MF 10 CAP AXIAL 0022MF 20 Y5P CAP AX 10 MF 50V CAP ELECTRO 2 2050 CAP FILM 001 100V 5 CAP ELECTRO 22025 20 CAP ELECTRO 22825 20 CAP ELECTRO 100950 CAP AX 10 MF 50V CAP ELECTRO 2 2050 CAP AXIAL 91 0 PF 2 NPO CAP AXIAL 001 MF 10 CAP AXIAL 001 MF 10 CAP AXIAL 680 PF 296 NPO CAP RADIAL 220 PF 5 N470 CAP AXIAL 0022 20 Y5P CAP RADIAL 220 PF 5 N470 CAP AXIAL 150 PF 1096 Y5P CAP ELECTRO 2 2050 CAP ELECTRO 10050 20 CAP AXIAL 6 8 PF 10 NPO CAP RADIAL 220 PF 5 N470 CAP ELECTRO 2 2950 CAP ELECTRO 4700 16 CAP ELECTRO 22025 20 CAP ELECTRO 22025 20 CAP ELECTRO 2 2850 CAP ELECTRO 10050 20 CAP AXIAL 6 8 PF 10 NPO CAP AXIAL 27 0 PF 5 NPO CAP AXIAL 43 0 PF 5 NPO CAP AXIAL 18 0 PF 5 NPO CAP AXIAL 12 0 PF 5 NPO CAP AXIAL 12 0 PF 5 NPO CAP AXIAL 39 0 PF 5 NPO CAP AXIAL 51 0 PF 2 NPO CAP AXIAL 100 PF 2 NPO REF PART NUM 3150420 3151648 3180018 3150420 3150690 3150750 3150350 3151405 3151260 3151364 3151065 3151295 3151648 3180241 3151405 3151405 3151362 3151648 3150420
138. aintaining mini mum gain AGC fast slow circuitry switches a resistor R303 in and out of the delay network at the output of Q130 The S meter drive current derived from AGC output and is shaped via diodes and variable resistors so that the meter accurately displays received signal strength The external muting feature is accomplished by applying ground to J103 the rear panel mute jack Grounding J103 turns Q150 off thereby turning Q151 off which forces the AGC line to 5 VDC The net result is full AGC on the IF amplifier stages reducing IF gain to its minimum level Q149 and associated components provide for an auto matic mute when power is first applied to the receiver to permit the active AGC level to be established smoothly 4 AM and SSB Detectors The 50 KHz signal splits into two paths following the last MOSFET stage Q110 One path enters the double bal anced demodulator IC U103 and the other enters a carrier limiter and regenerator strip to provide carrier port injection to U103 for AM mode detection Carrier limiting is provided through a linear stage Q108 and a digital gate U109A The output symmetry threshold of the digi tal gate is set by a variable resistor R158 in the positive feedback network of U109A The limited carrier is split into two paths at the Q109A stage One path is coupled thru R150 and CRIOI to the carrier input of 0103 for non synchronous AM detection CR101 conducts in this AM detect
139. al generator output to 60 dB above 0 5 uv 55 dBm and set the FM Full Scale Pot R 374 100K ohms on 2nd IF Audio board for full scale S Meter reading IV SECOND AUDIO BOARD TUNE UP AND TEST A 50 KHz IF Filter Tune Up Prerequisites 1 Digital control inputs 2 50 KHz Spectrum Analyzer and Tracking Generator 3 Buffer from output MOSFET Q2 to Analyzer input im pedance 2 K ohms or higher at 50 KHz 4 50 KHz 10 Hz source at approximately 30 dBm 1 Connect tracking generator to the IFinputjack j 3 and select the narrowest bandwidth i e 500 Hz with the digital control inputs 2 A low level peak should be visible on the analyzer display Adjust the tuning slugs on all of the pot cores to peak the response Ensure that the output not into com pression which will cause flattening of the passband Repeak if necessary 3 Select 2 3 KHz bandwidth and note the symmetry about 50 KHz Select 4 KHz bandwidth and note symmetry about 50 KHz The symmetry about 50 KHz will not be perfect but ripple peak symmetry across the band should be ob tained 4 Switch back to the 2 3 KHz bandwidth and if needed touch up the necessary pot cores that affect ihe response only minimum amount so that the 500 Hz bandwidth is not grossly affected Switch to the 500 Hz bandwidth The peak of the response should be within 4 dB of the 2 3 KHz bandwidth s response If not readjust 5 Switch to the 4 KHz bandw
140. an accurate counter to the 2nd LO output jack J107 and using the frequency up and down buttons adjust the PBT voltage to 5 volts 0 1 volt Then adjust the 22 525 MHz PBT oscillator L 131 for a counter fre quency of 45 05 MHz 100 Hz 6 Using the oscilloscope measure the level of the 45 05 MHz signal at the junction of C 380 and C 379 Adjust 3 violet coils L 138 L 139 and L 151 for maximum level Approximately 1 volt PTP should be seen here after these coils are tuned 7 Measure the RF voltage at the 2nd LO output jack J 107 and adjust L 138 L 141 and L 152 formaximum level After these coils are tuned typical voltage swing on the oscilloscope would be 1 5 V if J 107 is loaded with 50 ohms 2 5 V PTP if J 107 is unloaded Minimum level is 1 0 V PTP with J 107 loaded 8 Store the PBT offsets for each mode by using the following procedure a Select the desired mode using the MODE button on the front panel b Select the desired frequency using the frequency up and down buttons c Once the frequency is selected store the offset using the V M button d Repeat these steps for each mode as indicated in the following table MODE FREQ AM 45 0500 MHz FM 45 0500 MHz USB 45 0485 MHz LSB 45 0514 MHz 45 0492 MHz 45 0522 MHz e After having completed the above steps the jumper on the Factory Test connector should be re moved This will return the frequency up and
141. and produces 2 50 3 49 MHz signal 4 MHz LPF after U129 filters off the undesired mixing product and Q133 provides enough gain to ensure U126 sees at least a signal at Pin 8 The internal divider must divide the 2 50 3 49 MHz signal down to 10 KHz This division ratio N2 is calculated by the and loaded into U126 N2 will be an integer number within the following limits 250 lt N2 lt 349 Returning to the VCO output and 9123 after 0123 the VCO2 output is divided by 10 at U123 The output of U123 at Pin 4 is considered the PLL2 output The PLL2 output signal covers the range from 6 0 6 1 MHzin 10Hzsteps and is used by the outer loop to lock the outer loop VCO The frequency relationships of PLL2 are given by the follow ing equations 2 X 4 0 PLL3 f 10 X 1 R2 X 2 2 X 10X2 N3 35000 f 10 X 1 350 X 2 2 1 10 2 3 35000 N2 3500 fat 1 8 N3 350000 N2 3500 PLL2 f 10 10 2 1 10 2 N3 35000 N2 3500 f 1 10X1 8 N3 350000 2 3500 0 18 N3 3500000 N2 35000 OUTER LOOP PLL1 is the outer phase locked loop used to synthesize the Ist LO signal The output signal of the outer loop VCO the desired Ist LO signal VCO1 is actually 4 different oscillators each covering a different frequency band The correct oscillator is selected and enabled by the uP control signals VCO3
142. ced via the same serial port at U104 pins 37 and 38 Data is latched into the appropriate synthesizer to update thelr informa tion every 25 msec The remaining radio controls are provided by U103 a 34 bit serial to parallel converter Each output is open drain with current sink limiting set by R391 The last 8 output bits of U103 drive a digital to analog converter The outputs are weighted and summed to provide the reference voltage for the pass band filter tuning This voltage is factory calibrated for each mode of operation am fm etc and stored in the EEPROM U115 Front panel adjustment around the reference voltage is added at 01100 Ifthe VHF converter optionisinstalledit will be detectedby the presence of 5 VDC at P109 pin 4 If the radio is set to a frequency in this band the converter will be serviced in the normal operating loop of the software Serial data will be sent to the converter using the serial clock and data lines from 0104 These lines are gated to the converter by using U104 pin 29 to switch the pull up voltage to the buffers driving P109 pins 2 and 5 Microprocessor Block Diagram D 8439 26 CONTROL LINES U108 RTC 403 SEHZBAB B _ _ I HS232C 1 REAR PANEL O
143. d by Q107 and ifs asso ciated circuitry Both Q107 and Q108 receive their control signals from the microprocessor synthesizer board via the connector P107 The signal is then sent through a selectable attenuator which is formed by RL102 R163 and R172 When RL102 is in the off state the attenuator is bypassed When the attenu atorisselected a controlsignalissent to Q109 connec tor P107 which energizes RL102 inserting R163 and R172 into the signal path forming aresistive pad providing 10 dB of attenuation The signalissent through a9 1impedance matching transformer before reaching the bandpass fil ters The signalis then routedthrough 1 of 9bandpass filters The cutoff frequencies of each filter is as follows 0 0 5 MHz 0 5 1 5 MHz 1 5 2 5 MHz 2 5 4 0 MHz 4 0 7 5 MHz 7 5 10 5 MHz 10 5 15 MHz 15 22 MHz 22 30 MHz Each bandpass filter has a set of PIN diodes that are normally reversed biased unless the filter is selected The appropriate filter is automatically selected dependant on ihe displayed frequency This is accomplished when U102 7415145 receives data from the microprocessor via con nector P107 and selects the appropriate filter by turning on one ofits outputs which in turn removes reverse bias voltage on the selected filter s pin diodes allowing the signal to pass Following the bandpass filter the signal is applied to a selectable preamplifier consisting of relay RL100 Q105 2N5109 and its related circuitr
144. d high band Low band is a fixed band pass filter that passes 35 thru 54 MHz High band is a voltage tuned band pass filter that covers 108 thru 174 MHz in 15 discrete steps Both bands share the same amplifiers Q110 and Q107 The signals mix MX101 with one of six fixed local oscillator frequencies This divides the covered RF frequency range into six RF blocks The RF blocks are 35 54 000 MHz 108 124 999 MHz 125 138 999 MHz 139 151 999 MHz 152 163 999 MHz 164 174 000 MHz The converted block is passed on to the R8 R8E front end board CONTROL A 35 bit control code is sent from the R8 R8E the data line The control code contains the information required to select the correct preselector band the filter tune volt age the VCO select bits and the PLL A and N words The 35 bit control code is fed serially through U105 74HC595 then through U103 74HC595 and finally to the PLL chip U102 MB1504 When all 35 bits have been clockedin the enable is strobed to latch the data Now U105 contains the tunable filter code and worksin conjunction with RP100 R 2R SIP and 0106 LPC662 as a D A converter to generate the filter tune voltage 0103 74HC595 contains the band select bits for the preselector filters and PLL VCO s U102 is set up for the desired LO frequency SYNTHESIZER The synthesizer is a single loop design thatis phasedlocked to the 3 5 MHz crystal reference from the R8 R8E The heart o
145. d to anything 3 Connect the spectrum analyzer or RF voltmeter to the terminal of P 102 which attaches to the output of the crystal filter The pin connecting to the input of the next stage should not be connected to anything 4 Tune trimmer capacitor C 197 for maximum response and alternately adjust L 132 L 131 and if required C 197 for bestresponse The response should appear asshownin the sketch which follows Note that the ideal response would be flat However tilt as shown in the sketch is the more likely response and is acceptable within the limits shown 12 KHz 1 KHz LEN E 5 to 6 dB Gain 1dB 0 5 dB E 3 dB Down 45 MHz x 500 Hz Figure 2 5 Disconnect the spectrum analyzer from 102 and con nect to the P 103 terminal which connects to the output of the 45 MHz IF section The center terminal which connects to the next section should not be connected to anything Adjust the spectrum analyzer for a 10 dBm reference add 10 of attenuation 6 Add a shorting shunt to 102 so as to connect two ungrounded pins 7 Adjust the front panel RF Gain control until the AGC voltage as measured on pin 5 of P 106 is O volts 8 Adjust trimmer cap C 174 for maximum response 9 Alternately adjust C 178 C 179 for best response as illustrated in Figure 2 10 Advance the RF Gain to the fully clockwise position and note that the minimum gain between P 104 and P 103 is 25 dB Then ro
146. down buttons to the function of changing the receiver frequency as opposed to the PBT frequency C Loop 3 Adjustments 1 Use the front panel controls to set the frequency of the unit to 7 00000 MHz 2 Adjust the loop 3 VCO coil L 134 for a tuning voltage of 5 VDC 0 1 VDC as measured at the junction of 22K ohm resistor R 209 and 680 ohm resistor R 227 Insure that the VCO is running at 65 1 MHz by measuring with a counter at pin 11 of U 128 3 Set the frequency to 7 49999 MHz in CW mode and ensure that the VCO frequency is 65 0 MHz and the tuning voltage 5 greater than 4 0 VDC and less than 5 0 VDC 4 Attach a scope and counter to pin 11 of mixer IC U 129 through a high impedance probe and adjust the three yellow coils L 123 L 128 and L 129 to produce peak output at 63 5 MHz The level after peaking should be approximately 100 mV D Loop 2 Adjustments 1 Adjust the loop 2 oscillator coil L 135 for a VCO tuning voltage of 6 VDC 0 1 VDC as measured at the junction of 22K ohm resistor R 210 and 680 ohm resistor R 232 2 Verify that the oscillator frequency is 61 MHz measured with a counter and a high impedance probe at pin of U 123 3 Set the frequency to 7 50000 MHz in the CW mode and ensure that the VCO frequency is 60 MHz and the tuning voltage is greater than 3 0 VDC and less than 6 0 VDC 4 Measure the 3 49 MHz signal level at pin 8 of U 126 and repeak the three yellow coils L 123 L 128 and L
147. el 33 4 1 5 49 18 I ig I 2 23 ea 8 8 C D G etn oe ER H DRAKE 1 04 36 8034 USE 7 OO OO MOUNT THESE PARTS 6 6 9 A CIO ON SOLDER SIDE 08 12884 8 8 vg oe 1 2K od 88 8 E E 58 E 58 NE amp JOL 88 ag SS 3 199 R L DRAKE Co BC BEC BEC 680 8 BK 55 0 BO EC BO Ceres eed O Eos OO sen o sn 9 a se Qoi E N 5 gt oe Sa NN 58 a8 ag ps 5 1 0111 Oa 5 seme Qd BO BO BC BO Bs BO O BO BO SQ 0 QU Lei C104 MW 10 08 dou sa BO ela al 06 5 5 Ores zee B EO EO HO EO SO 55 RO qon N t m m E 2 of a 122 gt A a8 SK sE B 5 ES EB REQ 58 Das rax aos 5 509 BSC 85 BO 5 e e C Op 15 tres _ OJ 1 i 000000000000000000000000000
148. ency does not change but rather IF shifting occurs Q142 amplifies the 35 MHz reference signal to the 4 5 volt PTP levels required by the digital integrated circuits Like wise Q143 amplifies the 45 05 MHz signal to 4 5 volts PTP U132D mixes 35 MHz and 45 05 MHz and produces 10 05 MHz at Pin 11 U131 and U132A combine to divide the 35 MHzreference signal by 7 producing as MHzsignal at 0131 Pin 12 U132B together with the input phase shift circuit L150 C350 C351 and R285 double the 5 MHz signal to 10 MHz at U132B Pin 6 U132C mixes the 10 MHz signal from Pin 6 and the 10 05 MHz signal from Pin 11 to produce the 50 KHz BFO signal at Pin 8 A LPF reduces the undesired higher frequency products and provides a cleaner 50 KHz signal to J106 fao fang to 2 X 5 MHZ VHF REFERENCE The VHF reference is a 3 5 MHz signal derived from the 35 MHz reference oscillator and sent to the optional VHF converter board J105 The 35 MHz reference signal is divided by 10 by U130 The 3 5 MHz output at U130 Pin 4 is buffered by Q136 A LPF reduces harmonic content and provides a sinusoidal 3 5 MHz signal to J105 SYNTHESIZER AND MICROPROCESSOR BOARD PARTS LIST REF C100 C101 C102 C103 C104 C105 C106 C107 C108 C109 C110 Cl C112 C113 C114 C115 C116 C117 C118 C119 C120 C121 C122 C123 C124 C125 C126 C127 C128 C129 C130 C131 C132 C133 C134 C135 C136 C137 C138 C139 C140 C141 C142 C143
149. er 6 Set the signal generator level for 73 dBm 7 Adjust the AGC 1 set pot R 325 for an S 9 reading on the S meter 8 Repeat steps 3 through 7 until no further improvement can be made 9 Set the signal generator level for 53 dBm 10 Adjust the AGC 2 set pot R 382 for a 20 dB S 9 reading on the S meter 11 Repeat steps 3 10 if necessary until little additional im provement in S meter tracking is obtained With an S 9 reading obtained at a 73 dBm generator input level increases of signal level input in 10 dB steps should result in S meter tracking for 10 20 60 S 9 readings C SSB AM Squelch Setup 1 Select AM mode and set the frequency as desired 2 Set the signal generator to the same frequency as the receiver 3 Set the level for 50 dB S 9 on the S meter 4 Set the front panel Squelch pot for full clockwise rotation maximum squeich level 5 Adjust the squelch threshold pot R 115 until the re ceiver just squelches and then back it off until the receiver just unsquelches D Recovered Audio Output Tests Prerequisites 1 LF filter has been tuned 2 4ohm load for external speaker gt 4 7 K ohm load for line outputs 3 Oscilloscope 4 50 dBm 50 KHz signal 100 AM modulated with 1 KHz sinewave 5 Volume pot RF Gain pot Tone pot These items will be connected already if board is installed in a receiver unit 1 Preset POWER on NB off FM disabled
150. es a complete description of any avail able R8 R8E accessories including circuit descriptions pictorials and schematics LOCATING A MALFUNCTION The design of the R8 R8E permits access to the Synthesizer board by removing only the bottom cover of the receiver The Synthesizer board contains allthe reference frequency generation and the entire microprocessor digital control of the receiver The Front End board is accessible by removing the top cover of the receiver The Front End board contains all circuitry that converts the input signal to the 50 KHz IF prior to the main selectivity and audio detection The FM detection circuitry is also contained on this board The 2nd IF Audio boardislocatedimmediately below the Front End board It is accessible by securing the Front End board in a vertical position near the rear of the R8 R8E by positioning the routed tabs on the boardinto the slots provided on the top surface of the rear panel metal chassis Note that cabling to the Front End board is designed to permit full electrical operation of the R8 R8E with the board temporarily positioned vertically The Front Panel board is accessible by hinging the front panel down by removal ofthe top two screwssecuring the panel to the subpanel and loosening the lower two screws Intercon nection from board to board or control to board is with use of either flexible ribbon cable or flexible wire cable RF signal interconnects are accomplished using coaxial pin
151. es are put back in place Examples of these items are non metallic control knobs insulating covers shields and isolation resistor capacitor networks etc 2 Before returning the set to the customer always perform an AC leakage current check on the exposed metallic parts of the cabinet as well as antennas terminals screw heads metal overlays control shafts etc Be sure the set is safe to operate without danger of electric shock Plug the AC line cord directly into the 120V AC outlet do not use a line isolation transformer during this check Use an AC voltmeter having 5000 ohms per volt or more sensitivity in the following manner Connect a 1500 ohm 10 watt resistor paralleled by 0 15 mF AC type capacitor between a known good earth ground water pipe conduit etc and the exposed metallic parts one at atime Measure the AC voltage across the combination of 1500 ohms resistor and 0 15 mF capacitor reverse the AC plug at the AC outlet and repeat AC voltage measurements for each exposed metallic part Voltage measured must not exceed 0 3 volts RMS This corresponds to 0 2 milliamp AC Any value exceeding this limit constitutes a potential shock hazard and must be corrected immediately AC VOLTMETER Place this probe Good Earth ground each exposed such as a water pipe 1500 ohm metallic part conduit etc 10 watt PRODUCT SAFETY NOTICE Many electrical and mechanical parts in this chassis have spec
152. esizer board and adjust coil L 155 for a frequency of 35 00000 MHz x 10 Hz 2 Using an accurate oscilloscope measure the level at pin 1 of U 130 with the counter load removed It should measure at least 1 volt PTP with 1 5 volts PTP being typical 3 Using the oscilloscope measure the level at J 105 Again it should measure at least 1 volt PTP with 1 5 volts PTP being typical 4 Using the counter measure the frequency at J 105 The frequency should be 3 5 MHz x 10 Hz 5 Using the oscilloscope measure the level of the 70 MHz signal at pin 5 of U 128 Adjust the yellow coil L 154 for maximum level The level must be greater than 100 mV PTP and is typically 200 mV PTP B PBT Adjustments 1 Ground the center pin of the Factory Test connector P 108 Center pin connects to pin 29 of the uP through a 470 ohm resistor This causes the frequency up and down buttons to control the PBT tuning voltage 2 Preset the front panel PBT control to the 12 00 o clock position 3 Attach a high impedance voltmeter to the PBT tuning voltage line pin 1 of U110A and adjust the frequency up and down buttons for maximum voltage Then adjust the Full Scale Set DAC pot R 348 for 8 volts 4 Adjust the frequency up and down buttons for minimum voltage Then adjust the Zero Set DAC pot R356 for 2 VDC x 0 1 VDC This step will interact with step 3 Thus repeat step 3 and 4 until no further improvement can be ob tained 5 Attach
153. f the synthesizer is 0102 MB1504 The VCO signal is fed back through the buffer Q101 to U102 where it is com pared with the reference this generates an error voltage which is sent to the loop filter The output of the loop filter controls the VCO frequency so that it maintains lock to the crystal reference The locked VCO signals are sent through the buffer amp Q106 to drive the LO port of MX101 REF C101 C102 C103 C104 C105 C106 C107 C108 C109 C110 C11 C112 C113 C114 C115 C116 117 118 C119 C120 C121 C122 C123 C124 C125 C126 C127 C128 C129 C130 C131 C132 C133 C134 C135 C136 C137 C138 C139 C140 C141 C142 C143 C144 C146 C147 C148 C149 C150 C151 C152 C153 C154 C155 C156 C157 C158 C159 C160 C161 C162 PART NUM 3180125 3151649 3151649 3151649 3151649 3180125 3151587 3164165 3151649 3151649 3164190 3151515 3180125 3151649 3164027 3151649 3164020 3151649 3164018 3151649 3164010 3164022 3164027 3164018 3164015 3164012 3164010 3164008 3164010 3164003 3164010 3164003 3164006 3180125 3164010 3151649 3164010 3151649 3164010 3151649 3164010 3151649 3151649 3164165 3151649 3164047 3151515 3164150 3164190 3164020 3164020 3151649 3164190 3164047 3164190 3151649 3151649 3164145 3164047 3151649 3164145 3164165 DE
154. g two lines from U 103 to control the current through the LEDs Note thatthe synchro LED driven directly by the syn chronous detector circuitry Outputs for the RS232 interface serial port are provided by 0107 and 0112 while inputs are direct to 0104 The DTE RDY line is used only for detecting the presence of a terminal while RTS and CTS provide the handshaking for proper data transmission When a terminal is detected by alow at U113 pin 17 the software stops scanning the front panel keypad and begins providing handshaking signals on the CTSline Thus the keypad is disabled when a terminal puts the DTE RDY line low All bit timing and formatting for 9600 baud even parity 1 start bit and 1 stop bit is done internally by the controller U118 provides inversion and level shifting to translate 0 5 volt logic to 10 RS232 signals Pin 1 of J104 provides a 0 5 VDC carrier detect signal for use in scanning from a terminal or PC FRONT PANEL BOARD PARTS LIST REF C100 C101 C102 C103 C104 C105 P100 P101 P102 Q100 Q101 Q102 Q103 Q104 Q105 R100 R101 R102 R103 R104 R105 R106 R107 R108 R109 R110 2111 R112 R113 R114 R115 R116 R117 R118 R119 R120 U100 CR100 CR157 CR158 VR100 PART NUM 3151648 3151648 3151648 3151648
155. gc don RITZ 47K RIII 4 7K oz peg 5 GND DATA ENA STB C RIB2 6243 188 Orne 0 oc D QS Imo Eh i tea R22 8 220 0559 50 oso OZ 229 A in h 00 9 SHIELD P N 456 8261 A DIGO 222 CI 2600000 om ue ao cy C337 6815 0000000 Ian os PI C22 21 Lo B 0000 Re24 108 5 Ones rd 0855 Oy 9 on meso AN 8 m sido C195 ehe O60000 4 uu d 926514 tz 0116 200904 5 Our sie pisa ot DE My O O az t 418 r A MET cia 18 Fa Ora ties _ GON 47K ORS 1 6 gt ORIS o 00000000 us 0000000000 BEEP UNREG DC GND ICV 5V B ON OFF N B W N uude du ek M BOARD ASSY BWA INH BW 51 52 53 54 B4 B TO IF RUDIO POWER SUPPLY SCAN FDBKN I ENA BFO ON SYNCHRO TIMER RELAY PUR ON OFF AGC 577 NOTCH ON OFF AGC ON OFF N e Caes TA visi TO FRONT END BOARD ASSY
156. he analyzer 3 Adjust the Trimmer caps in the two high band filters C 182 and C 184 until the filter displays the desired response as shown in Figure 5 E Attenuation 125 135 145 155 165 175 185 195 205 Frequency MHz Figure 5 High Band FILTER RESPONSE 4 Set the R8 R8E to 108 MHz and observe the filter re sponse It should be optimum without further adjustment _ SIGNAL GENERATOR 1 KHz TONE 1 KHz FM Sensitvity and Microphonics Test 1 Install the converter in R8 RBE Receiver This must be done to eliminate electrical noise which would cause in accurate results 2 Measure 12dBSINAD at the following frequencies shown in the table using the setup shown in Figure 6 Make sure that the converter meets or exceeds the specification and that it is not microphonic at each frequency To check for microphonics tap lightly on the VCO shield while noting that the recovered audio remains a clear 1 KHz tone Sensitivity 45 123 MHz Better than 12 115 234 MHz dB SINAD 132 345 MHz 145 456 MHz 157 567 MHz 168 678 MHz Conv Ant 113 dBm FREQ FREQ R8 SINAD METER 10 8 Figure 6 Sensitivity Test R8 amp CONV Audio Out L DRAKE COMPANY 23
157. ial safety related characteristics These characteris tics are often passed unnoticed by a visual inspection and the protection afforded by them cannot necessarily be obtained by using replacement components rated for higher voltage wattage etc Replacement parts with these safety characteristics are identified in this manual and are shaded on the schematics Before replacing any of these components read the parts list in this manual carefully The use of substitute replace ment parts which do not have the same safety character istics as specified in the parts list may create shock fire other hazards BEFORE ATTEMPTING SERVICE CAUTION UNPLUG RECEIVER S POWER CORD BEFORE PLUGGING IN CABLES ON PRINTED CIRCUIT BOARDS AND OTHER COMPONENTS THEN DOUBLE CHECK FOR CORRECT CABLE POSITIONING BEFORE APPLYING POWER EVEN A MOMENTARY IMPROPER CABLE CONNECTION TO PRINTED CIRCUIT BOARDS OR OTHER COMPONENTS CAN CAUSE WIDE SPREAD DAMAGE TO INTEGRATED CIRCUITS AND DISCRETE COMPONENTS NOTE CABLES ARE NOTKEYED IN ALL CASES TO PREVENT IMPROPER INSERTION POWER MUST BE DISCONNECTED FROM RECEIVER S POWER CORD TO PREVENT POSSIBLE DAMAGE WHEN INSERTING CABLES SINCE MANY CIRCUITS REMAIN OPERATIVE WHEN THE POWER BUTTON IS OFF ALWAYS DOUBLE CHECK FOR CORRECT CABLE POSITIONING BEFORE APPLYING POWER The Service Technician 1 Safety Instructions 1 Table of Contents
158. ided by 10 to produce 3 5 MHz reference for the optional VHF Converter board The three phase locked loops are nested such that the inner most loop PLL 3 provides a reference signal to the middle loop PLL 2 The middle loop in tum provides a reference signal to the outer loop PLL 1 The inner loop voltage controlled oscillator is divided by 10 from a fre quency of approximately 65 MHz to 6 5 MHZ This 6 5 MHz signalis used to lock PLL2 on frequency A 1 KHz frequency step change at 65 MHz becomes 100 Hz step at 6 5 MHz and the PLL 2 voltage controlled oscillator will change by 100 Hz In similar fashion the PLL 2 voltage controlled oscillator output divided by 10 from a frequency of approximately 60 MHz to 6 0 MHz This 6 0 MHz signal is used to lock PLL 1 on frequency A 10 KHz frequency step change at 60 MHz becomes 1 KHz step at 6 0 MHz and the PLL 1 voltage controlled oscillator will change by 1 KHz A frequency step change of 1 KHz in PLL 3 is tracked out in turn by PLL 2 and then by PLL 1 Thus a 1 KHz frequency step in PLL 3 becomes 100 Hzstep in PLL2 and a 10Hzstepin PLL 1 the desired minimum frequency step size of the synthesizer output Synthesizer load numbers are generated by the micropro cessor and sent to each of the three synthesizer loops The load number is recalculated each time the frequency is changed either by the front panel keyboard or the main tuning wheel digital encoder The programmable div
159. ider value is thus determined for each synthesizer loop To covert the range of 45 1 75 0 MHz four individual voltage controlled oscillators actually comprise VCO 1 The re spective oscillator ranges are as follows 45 10000 to 52 49999 MHz 52 50000 to 59 99999 MHz 60 00000 to 66 99999 MHz and 67 00000 to 75 00000 MHz The microprocessor and related circuitry uniquely selects the proper oscillator from one of the four individual oscillators Within software ihe information corresponding to the operating frequency of the receiver is generated and sent to the front panel LCD display The passband tuning controlis connected to 22 525 MHz voltage controlled crystal oscillator VCXO which is doubled to produce 45 05 MHz This oscillator is controlled by the front panel PASSBAND OFFSET control and microprocessor digital to analog conversion control which permits manual override of the automatic passband offsets by mode Al though this oscillator is crystal controlled it is designed to allow its frequency to be moved over a limited range approximately 3 KHz centered on 45 05 MHz The 45 05 MHz output is used as the injection for the image reject mixer IRM on the Front End board which converts the 45 MHz Ist IF signal to the 50 KHz 2nd IF frequency The 45 05 MHz oscillator is also mixed with the 35 MHz reference oscillator to produce a 10 05 MHz signal which is used as one input to a digital mixer The 35 MHz reference oscilla
160. idth and adjust the necessary pot cores that flatten the passband as above Ripple should be maintained below 2 9 dB PTP The 6 dB points may end up slightly skewed to the low side when done Switch to the 500 Hz bandwidth The peak ofthe response should be within 4 dB of the 4KHzbandwidth s peak If not readjust 6 Step through all BW s noting symmetry passband flat ness and relative loss Relative loss between any two bandwidths should be less than 5 dB The 6dB bandwidth should be within 10 except 500 Hzbandwidth where bandwidths over 370 Hz are acceptable All shape factors C6 dB 60dB should be less that 2 2 except for the 500 Hz bandwidth where anything less than 1 40 is acceptable B A G C and S Meter Setup The Signal Generator referred to in this section is attached the antenna 1 input Preset the follwing pots as indicated Preset AGC 1 R 325 to 2 8 VDC at Pin 1 of U 116A Preset AGC 2 R 382 to 4 1 at Pin 7 of U 116A Preset IF Gain R 209 to the 12 O clock position Preset Full Scale R 336 to the 4 O clock position 1 Select the AM mode with the frequency set to 14 2 MHz Preamp should be off 2 Set the signal generator level for 103 dBm at 60 AM modulation with a 1 KHz tone 3 Adjust the IF gain pot R 209 for an 5 3 reading on S meter 4 Set the Signal Generator level for 13 dBm 5 Adjust the S Meter Full Scale pot R 336 for a 60 dB S 9 reading on the S met
161. ift at 45 05 MHz The uP controlled DAC provides programmable offsets which can be different for each mode The uP controlled DAC for PBT tuning is actually a variable gain amplifier U103 5450 under uP control through the serial data bus switches a combination of 8 precision 1 resistors to ground changing the gain of amp U110A LM358 Each mode AM CW USB etc can be pro grammed with a unique combination allowing a different factory programmed PBT frequency for each mode Addi tional tuning is available to the user through the front panel PBT adjustment which sets a reference voltage at U110A Pin 3 Both DAC and front panel PBT changes will affect the tuning voltage output at U110A Pin 1 Q128 and Q129 disable the 45 05 MHz signal when in the FM mode Tuned circuits around L138 L139 L141 L151 and L152 are tuned to 45 05 MHz thus enhancing the 2nd harmonic L140 allows the signal to be split into two paths Q135 amplifies the 45 05 MHz signal which is then coupled to J107 Connector J107 is the 2nd LO output port to the front end board 9134 amplifies the 45 05 MHzsignal which is coupled into the digital mixer circuit BFO DIGITAL MIXER The digital mixer combines the 45 05 MHz 2nd LO signal and the 35 MHzreference signalto produce the 50 KHz BFO signal The BFO signal is used in CW RTTY USB and LSB modes Because the BFO signal is directly related to the 45 05 MHz signal as the PBT is varied the operating fre qu
162. ihe middle loop provides a reference signal to the outer loop PLL1 The inner loop VCO output is divided by 10 from approximately 65 MHz to 6 5 MHz by U122 This 6 5 MHz signal is used by the middle loop to lock the middle loop VCO on frequency 1 KHzstep at 65 MHzbecomes a 100 Hz step at 6 5 MHz and the middle loop VCO will move or shift 100 Hz Similarly the middle loop VCO output is divided by 10 from approximately 60 MHz to 6 0 MHz by 0123 This 6 0 MHz signalis used by the outerloop tolock the outerloop VCO on frequency A 10 KHz step at 60 MHz becomes a 1 KHz step at 6 0 MHz and the outer loop VCO will move or shift 1 KHz Likewise a 1 KHz step In the inner loop becomes 100 Hzstep in the middle loop which becomes a 10 Hzstep at the outer loop VCO frequency In other words the middle loop tracks out any frequency changes in the inner loop and the outer loop tracks out any changes in the middle loop And the outer loop VCO frequency is the desired synthesized output REFERENCE OSCILLATOR All three loops are phase locked to the highly stable temperature compensated crystal controlled 35 MHzref erence oscillator The reference oscillator consists of a 35 MHz crystal 103 transistor Q140 and associated com ponents Resistors R299 R279 and R296 provide bias to the transistor Capacitor C367 has N750 temperature coeffi cient and provides the major temperature compensation Variable inductor L155 provides the frequenc
163. ion mode since the BFO ENABLE line is low and the SYNCH DET line is high which holds Q101 and Q102 in an OFF state Since pin 12 of U108 is at a high state with the limited carrier clocking pin 11 of U108 the Q outputishigh thereby turning Q104 to an ON state which prevents any 100 KHz carrier Synchronous mode from being applied to pin 3 of U108 With pin 9 of U108 in a high state pin 8 is in alowstate which grounds CR104 and keeps CR102 reverse biased as additional isolation to any 50 KHz regenerated carrier at pin 5 of U108 Note also with the logic high state applied to the DET line Q140 Q132 and Q162 are ON This condition provides a short time constant to the PLL generated 100 KHz local carrier 0112 to permit relatively fast acquisition of the carrier if the synchronous mode of detection is selected For synchronous AM detection the line is driven to a logic low by the system microprocessor related circuitry The line remains in a logic low state as for AM detection The limited 50 KHz carrier is doubled by U109B amp D and applied to the 100 KHz PLL circuit U112 which can provide an uninterrupted carrier that frequency tracks the original Note that Q140 Q132 and Q162 are OFF thereby providing long time constant to the PLL generated 100 KHz local carrier With Q104 OFF three succeeding stages of U110 phase shift the 100 KHz PLL carrier and applyit to the clock in
164. is calculated by the uP and loaded into 0109 N1 will be an integer number within the following limits 41 lt lt 340 The frequencies PLL 1 are as follows fico desired Ist LO output MI N1 350 f y 0 18 N3 3 5E N2 3 5E4 ref 1 18 N1 350 N2 3 5E4 N3 3 5E6 2nd LO PBT PASS BAND TUNING The 2nd LO is a 45 05 MHz signal thatis sent to the Front End board and digital mixer circuit The 2nd LO frequency actually varies depending on mode and front panel PBT adjustment thus providing IF shifting The 45 05 MHz signal is produced by doubling a varactor tuned crystal con trolled 22 525 MHz oscillator The oscillator consists of a 22 525 MHz crystal 7102 transistor Q126 and associated components It is not referenced back to the 35 MHz reference signal thus requiring its its own femperature compensation Capacitor C268 has N1500 temperature coefficient and provides the major temperature compen sation Variable coil L131 provides the frequency tuning adjustment Varactor CR117 provides a fine tune fre quency adjustment Fine tuning can be accomplished in ways 1 Front panel PBT adjustment 2 uP controlled DAC Note that in the following text circuit references to digital control can be located on the MICROPROCESSOR CIR CUITS schematic The front panel PBT control is user adjustment which pro vides approximately 2 5 KHz sh
165. joo O Qu E xS b 0000000 SHIELD P N 456 0258 000000 Genes o sero iof das GD E 3295745 32 8245 18 555 530 90000000 og 55 OS mo ICT e 2 Onset O 8 5552555 20 2 20 ESO 4 0 OFS EHO 10 Sl foy 4 0 zs 8 Cross 8 a BER Or 0 Oge 05250 4 E qe Og AO MEA 9062 0225 0 OO 069 aim 2774 CI E zus ri PRO 5 2 O PT o 0009 0008 9064 OE EO Orig 0000000 S50 93 HEN CES o OENE E 2 OE Lo Pes ar LL 3924 000 0000 185 M OESO 95390 Oel OS i 000 CES rm ED WAT oly Grist CC 8 9 2 e SE OO ED p bz IN d BOFRD RSSY D eo OSA O dones 58 KHZ BFO o EO x D Orat O SB Crop Orto gon Om LR OMS ES EMI HI MU RHOD Quay Oc m i po 376 eS d rr et IM 24 658529 z zz R241 THIS DOCUMENT CONTAINS INFORMATION WHICH IS CONFIDENTIAL AND PROPRI
166. ker The output of the power amplifier passes through the headphone jack before switching be tween the internal and or external speaker s AGC voltage developed prior to the demodulation is used to control the gain of the IF stages The same AGC signal is used to drive the S meter circuit to provide accurate received signal strength indication AGC decay time constants are electronically selected by front panel and microprocessor control FREQUENCY CONTROL The R8 R8E features synthesizer control of the received fre quency This allows the receiver to cover a wide fre quency range without the use of range crystals or other frequency determining elements The reference for the synthesizer is generated by a 35 MHz crystal oscillator on the synthesizer board This reference is used by each of three nested phase locked loops which operate over the range of 45 1 75 0 MHz fo provide a first local oscillator signal When this first local oscillator output is mixed with 100 KHz 150 KHz for R8E to 30 MHz incoming signals the result is a 45 MHz Ist IF frequency Additionally the 35 MHz reference is used in each loop to mix or translate signals to the appropriate frequencies In the PLL l loop the 35 MHzreference is used to translate the ouput of the PLL 2 loop from 6 0 MHz to 41 0 MHz Similarly the 35 MHz reference is doubled to produce 70 MHz which is used in PLL 2 and PLL 3 loops to translate signals The 35 MHz reference also div
167. lues of 9 5 mH Coupling and shunt capacitor values are switched via analog gates U111 113 114 and 115 and discrete transistors respec tively In addition the loading of the filter is switched similarly Switching a source resistor in the JFET amp stage preceeding the BPF compensates for the insertion loss of the 6 KHz bandwidth filter network 3 IF AMP and AGC Generator The AGC amplifier is comprised of three mosfet stages Each stage has a different gain control time delay to insure stability of the loop The outputstage has the least and the input stage has the most delay The gain control signal is generated as follows The output of the last mosfet stage Q110isrectifiedin the class C biasedstage 2130 which reduces the bias applied to the OP amp U116A The output of U116A is applied directly through three individual delay networks to the 50 KHz mosfet stages The mosfets employ reverse AGC e g a negative going control signal reduces the gain A fourth gain control path is buffered by a second OP amp U116B which outputs to the 45 MHz mosfet stage on the front end board The biasing of U116B allows its gain control signal to the front end to maximize the signal to noise ratio over the range of operation The AGC OFF circuitry shunts the IF output that would be rectified by Q130 and thus maintains maximum gain as set by the front panel control The mute circuitry rebiases the OP amps to the negative supply thus m
168. ly PIN 1 RED WIRE SHIELD 7 SHIELD VHF REAR PANEL CONVERTER OF UNIT ASSEMBLY FIGURE 1 DIS 3851590D 12 1992 VHF CONVERTER INS TALLATION INSTRUCTIONS 4 Route the free end of the 6 conductor VHF converter cable vertically down behind front panel near Volume Control to the board assem bly exposed by removal of bottom cover See figure 2 5 Position the VHF converter assembly into the chassis as illustrated Figure 2 The board mounted components should face toward the outside edge of the R8 with the larger of the two component side shields toward the rear panel of the R8 Align the two tabs into the slots located on rear panel of the R8 Reposition any cables at rear panel as necessary to allow converter as sembly to fit at the rear panel wall TABS SHIELD N FRONT 6 CONDUCTOR REAR PANEL PANEL CABLE FIGURE2 8 SIDE VIEW Locate the Retaining Bracket and position to edge of the VHF Converter assembly as shown Use the supplied 4 40 1 4 Pan Head Philips screw to secure the bracket to the R8 chassis Figure 3 BRACKET SCREW 4 40 X 1 4 Pan Head Phillips FIGURE 3 6 With the converter assembly now secured in the chassis with 6 conductor cable attached position the R8 so it rests on its left hand side facing front of receiver Locate the uncon nected end of the 6 conductor cable and connect it to the synthesizer board connector in the orientation shown in Figure 4
169. m insertion loss of 10 dB 8 Remove generator and spectrum analyzer and con nect a jumper on P 103 so that it connects the output of the 45 MHz IF section to the Image Reject Mixer section input G F M Detector Alignment And Checks 1 Connect a SINAD meter and 4 ohm load to the receiver s audio output 2 Connect asignal generator to the ANT 1 terminal J 104 and for 29 MHz 50dBm output FM modulated 1 KHz tone 3 5 KHz deviation Tune the receiver to 29 MHz select the FM mode 3 Insure that jumpers are in place on P 105 P 104 and P 10250 asto establish a signal path through the receiver to the FM detector 4 Connect a counter high impedance input to pin 20 of the MC3362 IC U 100 and adjust L 111 34 300 MHz 10 Hz 5 Connect a counter impedance input to pin 4 of the MC3362 IC U 100 and adjust C 132 for 10 244 MHz 10 Hz 6 A KHz tone should be heard at the output of the 7 Adjust ihe generator level to 100 dBm and adjust FL 101 for best SINAD 8 Reduce generatorlevel to 113 dBm and adjust C 160 for best SINAD 9 Check for a minimum of 12 dB SINAD at 113 dBm input H FM Squelch Adjustment 1 With equipment still connected as per the proceeding section switch the signal generator level off 2 Adjust the FM signal level threshold pot R 117 on the Front End board to read 2 0 volts DC on pin 7 of the LM358 IC U 101 3 Set the sign
170. mixed with the 45 1 75 MHz 1stlocal oscillator LO to create 45 MHz Ist interme diate frequency IF signal Conversion is accomplished by standard level double balanced mixer DBM pro vide wide dynamic range The output of the DBM is then amplified by alow nolse high dynamic range junction FET amplifier to insure proper receiver sensitivity This stage is followed by a 4 pole monolithic 45 MHz crystal filter The purpose of this filter is to attenuate signals more than 6 KHz removed from the 45 MHz IF center frequency thus protecting theremaining stages of the receiver fromstrong adjacent signals yet permitting sufficient bandwidth for proper narrow band FM reception In this manner opti mum receiver dynamic range is preserved while providing proper sensitivity The output of the crystal filter is then split between the FM detector circuitry and the remaining 45 MHz IF circuitry When the FM mode is operational the 45 MHz Ist IF signal is demodulated by a dual conversion FM detector inte grated circuit The detected RF level is used to control an audiosquelch gate The recovered audioisrouted through the squelch gate to the audio amplifier stage In the remaining AM CW RTTY LSB and USB modes the signal is amplified by a tuned dual gate FET amplifier to which automatic gain control AGC voltage is also ap plied The output of this amplifier stage isthenrouted to the image reject mixer IRM which converts the 45
171. nd tune in an external signal generator signal for a beat note at 1 5 KHz 2 Enable Notch 1 With the above 1 5 KHz sinewave displayed on an oscil loscope connected to the audio output and the front panel NOTCH control fully clockwise adjust the level so that the signal spans the 8 vertical divisions of the oscillo scope 2 Notch out the signal with the front panel NOTCH control 3 Adjust the Notch Depth pot R 184 to further reduce the signal 4 Repeatsteps2 and3 for maximum null The signal should be less than 1 5 of one of the 8 major divisions which corresponds to 32 dB of attenuation 5 Check notch at 500 Hz and 3 KHz modulation where attenuation should be greater than 30 dB 6 Notch attenuation for modulation above 2 5 KHz should be at least 30 dB Nolse Blanker Check and Adjustment Prerequisites 1 LF and audio circuits operational 2 Signal Generator set for 2 1 MHz at approximately a 95 dBm output level 3 Pulse Generator set for 250 Hz repetition rate pulse width of 55 usec and output level set to 0 5 1 0 1 Combine the signal generator and pulse generator out puts into the 50 ohm antenna input of the R8 R8E receiver Turn the Power ON to the receiver 2 Set the receiver for LSB mode 2 3 KHz BW AGC slow Preamp Off Noise Blanker Off RF Gain fully clockwise and select the Antenna 1 input Tune the receiver to a fre quency of 2 MHz 3 Monitor the audi
172. nerator 1 Noise Blanker The noise blanker IC U117 incorporates internally an AGC d amplifier strip AGC control peak detector noise differen tiator time controlled RF gate and time controlled audio hold circuits Pin outs are provided for externally con nected timing elements Noise bursts entering along with the IF signal are differen tiated and trigger the RF gate off Triggering threshold is raised by paralleling the differentiating cap C355 with a resistor Switching a 1K resistor R366 disables the trigger ing completely Once triggered the gate off is deter mined by the RF blank resistance R362 and R361 The triggering of the RF gate is followed by the triggering of the audio hold after an externally programmed delay R340 passes The audio hold time determined by R341 and C337 is selected to span the hole created after gating off the RF carrier 2 Step Variable BPF The BPF has five bandwidth selections which default in response to the mode of transmission selected i e 6 KHz for AM The other bandwidths can be envoked in se quence from the default BW Pass band tuning can be utilized to skew the signal reception to either side of the passband center for improved channel rejection and or frequency response The BPF results from the cascade of two four pole Chebyshev BPF sections isolated by one stage of AGC d amplifica tion Centered at 50 KHz all bandwidths are designed around fixed inductor va
173. o be loaded whenever the frequency changes A 10 KHz step is achieved by chang ing N2 and a 100 Hz step is obtained via PLL3 The step size of PLL2 is determined by the reference signal and R2 Step size ref signal R2 The reference signal at Pin 1 is 3 5 MHz R2 350 giving a PLL2 step size of 10 KHz This also represents the frequency at which the phase comparison is performed inside U126 The output of the phase comparator is a DC tuning age at Pin 5 and it is used to tune the VCO The tuning voltage is filtered by the loop filter a LPF consisting of U 127 R230 and R231 C285 and C286 The loop filter output voltage at Pin 1 of U127 is applied to varactors CR121 and CR120in the VCO This VCO VCO2 consisting of transistor Q125 and associated componenis tunes from 60 to 61 MHz Capacitors C258 C259 C261 and C262 variable in ductor L135 and varactors CR120 and 121 determine the frequency of oscillation The 2 output is filtered by a LPF and buffered by Q123 and 2131 After Q131 the VCO2 outputis mixed with a 63 MHzsignal and translated to approximately 3 MHz by 0129 The 63 MHz signal is directly related to the PLL3 frequency The PLL3 outputis mixed with 70 MHz at 0121 A 63 MHz selects the desired mixing product and completes the translation of the PLL3 output from the 6 5001 6 5100 MHz range to 63 4999 63 4900 MHz range U129 mixes the 63 49 MHz signal and the 60 61 MHz signal
174. o by connecting an oscilloscope to the External Speaker output at the rear panel of the receiver 4 With the Pulse generator disabled but connected to the receiver tune the R8 R8E to receive a 1 KHz beat note at a received level of 55 5 Enable Pulse generator andincreaseitslevelto yield 1048 99 S meter reading on the R8 R8E 6 Enable the noise blanker The S meter reading should reduce to an 5 5 reading 7 Switch to the AM mode and remove both the signal generator and pulse generator inputs Observe the audio on the oscilloscope If horizontal bars appear in the re ceiver noise output adjust the Noise Blanker Threshold pot R 363 to a point that the bars are just eliminated Re check the blanking as done previously in step 6 to insure that the noise blanker operates properly Note that the Threshold pot R 363 is adjusted only to prevent false triggering and has no effect on the blanking depth VHF CONVERTER ACCESSORY VHF BLOCK CONVERTER THEORY OF OPERATION RF Section The signal input from the CONV ANT terminal is amplified and filtered as it passes through the preselector The prese lection filters divide the frequencies into two bands low band an
175. oa RIS 5 522 C T RIM Once Se IX 0132 22 doy a Or one 0000 d E Ho 505 OU E 1K H5 gs OS 10 210 5 ORES 2 8 is amp 162 sea wo 32O 4 cud v OS SO Qe RO R133 1 L com nies 1226 3 7 SEE NOTE 1 F Be Me dol c 0152 N om x Cus no B 46 Pn RIS amo T 8 pray eu C Oz Mc ces Q8 1806 RE 0 an BON OIG 18 19 Pa IECIT OEE KS NOS ove Qeri O nd m GOW 5009 B diio genre LO s 089 80 9 8 8 00000000 0050000 0950 ones 6 9 8 9 o Os 35 MHZ REF OSC C OO FREQ ADJUST Book on PBT 69 o OG 1881 R LL DRAKE RO 5 ATEN 0000000 frias en O ER 4126 0 0 3296746 ET CEA 9 ETT o 0 O O Pera 0 E 0 6 pou per oe ix CONTROLQ OOO pu TO IF RUDIO POWER SUPPLY CRIS 18 Ga wi eS no yaa 2 E O 658 ogoro SHIELD P N 456 8272 9391 IK 5 120734 a BOL jm oo 000000000000 000000 2000 erum at
176. oes not occur check the 6 conductor cable assembly of the VHF converter Once proper operation is noted tune in a known active signal in either the range of 35 55 MHz 108 174 MHz Select the proper mode bandwidth and other parameters as appropriate HINT In many areas of the U S the NOAA weather stations are active on one of the follow ing frequencies 162 475 MHz 162 550 MHz or 162 625 MHz One of those or a similar type station could be tuned in as a convenient operational check Once correct operation is verified disconnect the R8 from the AC Power Source Secure the top and bottom covers with remaining screws if this has not already been completed in steps 11 and 12 The R8 with VHF Converter is now ready for tion VHF OPERATION Operation of the R8 in the VHF Bands of 35 55 MHz and 108 174 MHz is accomplished by entering the desired frequency directly as described on page 12 of the Owner s Manual DIRECT FREQUENCY ENTRY Additionally the 28 automatically will tune to the 35 55 MHz band followed by the 108 174 MHz band as the main tuning dial is tuned above 30 MHz All reception modes are supported in the two VHF bands SPECIFICATIONS Frequency Range Antenna Impedance Sensitivity SSB CW 10dB S N N Sensitivity AM 10 dB S N N 1 KHz 30 mod Sensitivity 12 dB SINAD Frequency Stability Power Requirements FCC Approval Weight Size Apply
177. on Set the tracking oscillator level fo 30dBm and adjust the top of the screen to 20 dBm sweeping from 0 to 110 MHz As an alternate method a signal generator and RF voltmeter can be used using the same levels as mentioned above 2 Connect the tracking oscillator signal generator output to the ANT 1 jack J 104 3 Connect the spectrum analyzer or RF voltmeter to P105 so that the 45 MHz IF section is disconnected and Pin 2 of P101 is terminated in 50 ohms 4 Select each of the 9 front end bandpass filters by tuning the receiver to the frequency listed on the following chart Filter ripple should not exceed 2 dB and the mini mum and maximum frequencies for each filter should be 4dB 5 dB below the through connection reference set up in step 1 BAND FREQUENCY RANGE RCVR FREQ 0 1 0 5 MHz 3 MHz 0 15 0 5 MHzon R8bE 3MHz 2 0 5 1 5 MHz 7 MHz 3 1 5 2 5 MHz 2 0 MHz 4 2 5 4 0 MHz 3 5 MHz 5 4 0 7 5 MHz 7 0 MHz 6 7 5 10 5 MHz 9 0 MHz 7 10 5 15 0 MHz 12 0 MHz 8 15 0 22 0 MHz 20 0 MHz 9 22 0 30 0 MHz 28 0 MHz 5 The sketch shown below gives an approximate representation of how each filter should appear on the spectrum analyzer Reference 3 5 2 0 dB Figure 1 B With the 22 30 MHz band selected enable the attenu ator and check for a 10 dB drop in spectrum analyzer or RF voltmeter response Then disable the attenuator Enable the preamp and check for 10 dB inc
178. oxe t 220 1 1504 1 1 5V A 45 MHz t 1 1 48587 4 8V TO IF PS BD CV gt R300 1320 1 gt 1 i OSCILLATOR CY CA gt tot IX 04543 220 220 1 Laso 1 157 3563 8307 0375 a R108 L _ 3524118 1 5 6uH 8386 510 47K H 18524515 gt 5V 2838 EE I nio 0019 00 u i 1 7 4 7K 304 1450 cas lt 144148 gt ca72 220 18uH 535 ag gt lt gt 1 86133 L 1 2510084 ae L Baur 150K 1 8281 103 SepF HSHHz 24 99 9544 1343 ciso dicm t 2 2K 4 5V PTP 1 SUH 109 N750 15897 e 5 2N3904 5 28kis2 60 62MHZ i NOE 3563 1 68107 C114 6923 T R110 P 8132 152186 N 7K CR111 150 zi ITT310 1 XN 4 1 LL 12 tios V i 1 8524116 nee 5 1 A 1 1 1 6113 LL 1 0104 LR CV 2N3904 gt 8257 Lisa CR 1 ENS 10 3524104 8135 Rees VHF REF A312 1 150K cp 5248 1 10v 4305 47K 1 Asas 1415 C144 gt 1 irc x i iK 5 2332 8110 1 270 25M192 67 75 2 cass eND LO PBT i wer HHI lee 03 C8108 C340 3563 8334 152186 8 2pF 1 gt 6499 1 A267 5148 1 CHi12 M 1 150K 1
179. pump and loop filter The low band oscillator consists of transistor 2107 and associated components The low band charge pump consists of Q113 9114 and 9115 and associated components The low band loop filter consists of R170 C165 and C163 The high band charge pump 9116 Q117 and 6118 and the high band loop filter R173 C169 and C170 tune the remaining 3 oscillators Q108 tunes from 52 50000 to 59 99999 MHz Q109 tunes from 60 00000 to 66 99999 MHz and Q110 tunes from 67 00000 to 75 00000 MHz The VCO 1 outputis buffered by Q106 and filtered by a LPF After the LPF the signal path branches into two directions Q111 9100 and Q101 provide gain and reverse isolation at J100 J100 is the Ist LO output port to the front end board 2112 and 9119 buffer to 0116 The output is mixed with a 41 MHz signal and translated from the 45 1 75 0 MHz range to the 4 1 34 0 MHz range by 9116 The 41 MHz signal is directly related to the 2 frequency The PLL2 output is mixed with 35 MHz at 0117 41 MHz BPF selects the desired mixing product and completes the translation of the PLL2 output from the 6 0 6 1 MHz range to the 41 0 41 1 MHz range A 35 MHz LPF after U116 filters off the undesired mixing products Q120 and Q121 provide enough gain to ensure U109 sees at least 1 volt at Pin 1 The programmable divider inside U109 must divide the 4 1 34 0 MHz signal down to 100 KHz This division ratio
180. put pin 3 of U108 The output signal at pin 5 of U108 is divided by two a 50 KHz synchronous carrier that is conducted thru CR102 to the carrier input of U103 Pin 8 of U108 is a logic high which results in a reverse biased CR104 and a 5 VDC level applied thru R189 to illuminate the front panel SYNCHRO LED For SSB operation the BFO ENA line is set at a logic high state which turns Q101 ON thereby clamping the limited carrier input of UTO9A to 0 7 VDC and setting the output of U109A to zero The logic high on the BFO line inhibits the PLL circuit 0112 Also with Q102 turned ON Q104is ON and no outputis possible from 0110 With no limited carrier or synchronous locally generated carrier present at the junction of CR101 and CR102 the 50 KHz BFO carrier from J109 is sent to the carrier input of U103 Regardless of the detection mode the demodulated audio is present at pin 6 of U103 5 Audio Processing The detected audio from the demodulator IC passes through the audio hold circuit of the noise blanker IC The hold function is only availabie in the AM mode Leaving the hold circuit the audio passes through the tone control circuit 0106 which allows 10 dB boost and cut of the bass response The audio notch follows the tone control The notching fre quency is made variable by employing a variable BPF U107B in a split signal network that cancels at the BP center frequency The notch is disabled by switching off
181. rease in spectrum analyzer or RF voltmeter response Then disable the preamp D Antenna Switching Checks 1 Select the ANT 2 50 OHMS antenna jack J105 from the front panel connect the tracking oscillator or signal generator to J105 and repeat steps B and C 2 Connect the tracking oscillator or signal generator to the ANT 2 500 OHMS antenna jack J3 using an appro priate impedance adaptor and repeat steps B and C This test can also be performed at the 500 ohm terminal but a 50 500 ohm balun must be used for proper impedance matching 3 Temporarily connect pins 1 and 4 on P 109 together with a lOKresistor This fools the Pinto thinking that a VHF board is installed Select the VHF CONV 50 jack from the front panel and connect the tracking oscillator or signal gen erator to the VHF CONV 50 jack Then repeatsteps Band C Remove the 10K Ohm short connecting pins 1 4 of P 109 F 45 MHz IF Section Alignment And Tests 1 Calibrate aspectrum analyzer and tracking oscillator or signal generator and RF voltmeter with 50 ohm termina tion with a thru connection Set the tracker level at 40 dBm and adjust the top of the screen reference for 20 dBm centered on 45 MHz 10 KHz per division 2 Connect the tracking generator or signal generator output to the Pin 2 of P 104 which connects to the crystal filtersection input Pin 3 of P 104 which connects to the SBL 3 mixer output should not be connecte
182. s drawing applies to R8 R8E units with SEE NOTE 4 0022uF C325 1N4148 cA127 Caisa t 1 pid HF GAIN II 279 siia 992998 M serial S N numbers previous to 11100000 1M gt A 9155 FROM L November 1991 2M3904 PIN C329 Ch135 I g eur 4 M4148 8375 8330 ca27 nna 10K 33K lt FROM mano 0161 SIONAL ca138 2N4125 STRENGTH 8 gees 7 M4148 lt 5551 gt gt QUE gt 8356 2134 C328 TO P113 8328 C336 C335 10K 2M4425 OB gaur PIN 86 iur 1iuF BLAMKING 10K GELEI H THRESH AUDIO 10V we L L 100K Sees ADJ Riga 8377 cass 4 0022uF 5vo 3 9k 2 2uF C 924V 18897 8 0VDC e g C30 a NC T T1 5 0 ey mp my wu mm ns ee tn at A 7 1 i FROM J108 i PIN 7 i HIGH 40K FULL 337 A378 9364 UiisB 1 BETWEEN POINT AND CHASSIS GNO 24 OHMS L FAST AGC 95392 CHi31 SCALE 91 C LM358 P113 SUPPLY BETWEEN POINT ANO CHASSIS DHMS 4K R325 1N4148 1 4148 5 PIN 4 LIE i BETWEEN POINT ANO CHASSIS GNO AGE 46 BH gt 0M A 410v aisi WARNING PAAT
183. ss i 3524104 1 R135 Lese AL L 150K I iur 4 45 1315 144 110 1 272 6 1 25K192 67 75 2 LM 117 1 152186 8 2pF C8112 1 H 1TT310 las o5MHz 1 L 1 0 1 L104 1 L 2125 5 6uH C8103 t 184148 2 E SCORE 1440 Risa 20300 THIS OQCUMENT CONTAINS INFORMATION WHICH 4 gt IS CONFIDENTIAL AND PROPRIETARY AND IT IS 0 10V 45 1 75 0HHz vicis euis 700mv PTP vi R248 C196 22uF L C157 820 Q1UF 4 9 5 0 MHZ 220 2 5V 6 1V0C 200mv 6 0 6 1MHz U220 C176 0332 200mV 100 01 C C274 2N3904 35vnc 003 u125 C192 C190 c 88 174 C309 lt 310 9V C HC145157 iur 8 15voc 10 1 5pF 1 5pF 10 C 3322 Tea A186 33 6 R247 I L 65 0 65 1MHz 220 9 8228 21 0 41 1MHz 750 V vaio zi 33K 197 Somv 4 754 78 05 T eat p 75vp C C232 C256 gM 91248 c ss a eur iau 515056 28 iuf voc L L von DAX Laza 175 fox gt O1uF t121 gt 75 Li20 22uF VIO C278 cars O1uF A226 3 9K RIS 100 65 0 65 1HHz L vaioo 9396 ces 781 05 dur cA118 152208 I Rigs
184. tage at pin 1 6 157 2 0 0 5 6 Check voltage at pin 1 Table 1 Preselector Tuning and Checks A Low Band 35 54 MHz 1 Connect a Spectrum Analyzer and Tracking Generator to the VHF Converter so that the Tracking Generator output connects to the Converter Antenna input jack J 103 and the Spectrum Analyzer input connects to pin 1 of mixer MX101 See Figure 3 Tracking Generator level should be no higher than 30 d8m b Spectrum Analyzer settings should be as follows Bandwidth 300 KHz Scan Width 5 MHz Division Low Band 10 MHz Division High Band Input Affen 10 dB Center 45 MHz Scan Time 2 mSec Log Ref OdBm TO MX 101 CONVERTER ANT PIN 1 le TRACKING GENERATOR 30 dBm max VHF CONVERTER Figure 3 SPECTRUM ANALYZER 2 Set the R8 R8E to a test frequency 45 MHz a the low band filters will be selected and their frequency response displayed on the analyzer 3 Adjust the trimmer caps C199 amp C200 in the two low band filters until the desired response is achieved as shown in Figure 4 10 Attenuation dB 58888 25 30 35 40 45 50 55 60 65 70 Frequency MHz Figure 4 Low Band FILTER RESPONSE 108 174 2 1 Leave equipment connected as in Low Band Tuning procedure 2 Set the R8 R8E to 168 MHz Now the high band filters will be selected and their frequency response displayed on t
185. tate ihe RF Gain control counterclockwise and observe that the gain can be reduced a minimum of 40 dB In other words stage gain should be variable from approximately 15 dB to 25 dB Also check for lack of passband shape distortion over the AGC range 11 Remove the test equipment from P 104 and insure that jumpers are installed on P 105 P 104 and P 102 so as to establish a signal path frem the antenna up to P 103 F Image Reject Mixer Section Alignment And Tests 1 Calibrate a spectrum analyzer and a signal generator by establishing a thru connection between the generator and the analyzer Set the generator level to 20 dBm and adjust top of the screen reference for 20 dBm Accurately set the frequency of the signal generator to 45 MHz 2 Connect the signal generator to P 103 The stages pro ceeding P 103 should be disconnected 3 Connect the spectrum analyzer input to 50 KHz output jack J103 and make sure that 45 05 MHz signal is being supplied to 2nd LO IN jack J102 at alevel of approximately 10 dBm 4 Locate the 50 KHz output response on the spectrum analyzer and tune capacitors C 188 and C 191 for maxi mum response 5 Switch the signal generator frequency to 45 1 MHz and retune C 188 and 191 for minimum 6 Repeat steps 4 dnd 5 for maximum rejection at 45 1 MHz input and maximum output at 45 0 MHz input The mini mum rejection should be 30 dB 7 Set signal generator to 45 MHz and check for a maxi mu
186. to the operation of the VHF Converter assembly installed in the R8 receiver 35 55 MHz 108 174 MHz 50 ohms Less than 0 25 uV 2 3 KHz Bandwidth Less than 1 0 Less than 0 5 Better than 10 ppm 10 to 509 determined by the R8 master reference oscillator 10 VDC 150 mA Part 15 Certification 6 7 0 2 Kg Length 9 5 8 24 4 cm Width 2 1 2 6 4 Height 1 1 8 2 9 DRAKE Drake Company 230 Industrial Drive Franklin Ohio 45005 U S A Customer Service Center Phone 513 746 6990 TELEFAX 513 746 4683
187. tor is divided by 7 to produce a 5 MHz reference which is used as the second input fo the digital mixer The resultant output of the mixer is a 50 KHz IF signal that tunes 3 KHz in step with the 45 05 MHz 2nd mixer injection This 50 KHz signal is used as the BFO to the AM and SSB product detector Since the 45 05 MHz oscillator is used as the mixer injection which produces the 50 KHz IF signal and BFO the 45 05 MHz output can be moved in frequency without changing the receiver operating frequency Therefore as the 50 KHz BFO is changed by changing the PASSBAND OFFSET control voltage the 45 05 MHz injection signal to the IRMis changed by an equal amount This allows the 50 KHz 2nd IF signal to be positioned anywhere within a 3 KHz range with respect to the passband of two cascaded four pole 50 KHz bandpass filters on the 2nd IF Audio board while the receiver remains tuned to the incoming signal This technique provides the PASSBAND OFFSET INTERCONNECT DRAWING PARTS LIST REF PART NUM DESCRIPTION D1 3080034 DISPLAY LCD 051 3470004 LAMP NEON NE 2E A9A El 3260008 ENCODER WHEEL 600 128 Fl 3420127 2A SLO BLO FUSE 2 3420258 T400mA FUSE 3281024 JACK PHONE 21 5006 J2 3280011 UHF 50 239 CONNECTOR J3 3280011 SO 239 CONNECTOR J7 3301264 2P QUICKCONNECT 2055107 8 DIG KEYBRD PAD ASSY KBD2 2055168 18 DIG KEYBRD PAD ASSY MIRI 3581010 S METER RI 3260005 RES VAR AF RF GAIN 3K 10K R2 3260006 RES VAR PB
188. tracks with the 2nd LO The synchronous detector generates a synthe sized 50 KHz carrier that is locked to the received AM carrier The loop time constant is sufficiently long to maintain the 50 KHz carrier during periods when the received AM signal fades Once detected the recovered audio is routed to the noise blanker As noise bursts are detected on the 50 KHz IF signal the IF signal is turned off for the duration of the pulse The audio Is routed through the noise blanker so that the audio signal level is held at a constant level for the duration of the noise pulse The audio is then applied to a tone control circuit which provides 10 dB of bass boost and bass cut as the front panel tone controlis rotated to extremes Following the tone control the audio is applied to the notch circuit Audio frequencies from 500 Hz to 5 KHz are nulled by summing the audio with a 180 phase shifted and bandpassed audio signal The notch is disabled by turning off the bandpass filter section of the circuit Following the tone and notch circuits the audio is routed to the squelch gate The squelch reference for all modes including FM is the buffered AGC line with the squelch trip point set via the front panel squelch control The unsquelched audio is then sent to a buffer and 5 KHzlowpass filter From this point audio is routed to two buffered line audio outputs and also to the volume control which feeds the audio power amplifier for the spea
189. troller is expanded by using two lines from U107 as the high address lines The System is driven by 6 MHz oscillator giving an execution speed of 400 KHz Nonvolatile memory is inthe EEPROM 1115 which retains memory channels current radio settings etc even with loss of power A real time clock chip U108 provides the time for the clock and timer functions It will continue to keep time for approximately 20 minutes with loss of power due to holding capacitor C389 which provides supply voltage to the chip for that long U111 provides address decoding for the entire system At power on the entire system is reset by the RESET line being held low momentarily This is generated by com parators U102C and U102D The length of the reset pulse is set primarily by the time constant of R332 and C387 dis charging through the output of U102C At power down ihis circuitry also generates a low voltage reset signal triggered by U101 The reset signal is preceded by an interrupt signal from Q144 which allows the controller to save the present radio settings to U115 and do other housekeeping functions to allow an orderly power up when power is restored Software execution is such that all functions are performed once every 25 msec The sequence includes reading the keypad wheel inputs setting the radio control lines set ting all frequency synthesizers and updating the display 2 Radio Controls The three frequency synthesizers are all servi
190. up 61 Recovered Audio Output Tests 62 Synchronous Detector Setup 62 Full Notch Adjustments 62 Noise Blanker Check amp Adjustment 63 VHF Converter Accessory 65 VHF Block Converter Theory of Operation 67 RF Section m M 67 Control 67 Synthesizer 67 VHF Converter Alignment 75 75 Preselector Tuning and Checks 75 Sensitvities amp Microphonics Test 76 PARTS LISTS Interconnect Drawing amp Misc Chassis Parts List 7 Front End Board Parts List 13 Second IF Board Parts List 21 Synthesizer amp Microprocessor Board Parts List 33 Front Panel Board Parts List 51 VHF Converter Board Parts List 69 Receiver Block Diagram ___ 9 Interconnect Diagram 10 Front End Board Schematic 17 Front End Board Pictorial 18 2nd IF Audio Power Supply Schematic 27 2nd IF Audio Power Supply Pictorial
191. v 8287 _ 2 2uF 2 242 V96 8582 6 EXT SPKR 50K 7 45v aios C130 J270 10uF PEN 98206 d J100 SOKHZ 100K 65140 s 12 4Vpp ea 2N3904 1 SPEAKER casos P103 204148 402 BKHz CENTER 308 MUST LET FREG ADJ 100K STABALIZE 2 20 106 2 5VDC gt pees CL C LI 8175 469 En D1UK FROM FRONT PANEL QU BK 40K PBT POT WIPER Bo o P110 FROM 406 L BED FROM 106 asy h Bi 2200 RIBH NOTCH OFF 3 844 GET gt T er MEADPHONE Aisa 62K 041028 FROM P113 140 44 33 05 2 PIN 4 Sur 11 16V SW 10K dii cer R214 HEATSINKE _ aur 125 47 10V 1 6 37 TT 470uF WO E 2 2uF TO P113 2482 5 gt PIN 7 V110A C336 2 8315 10 gt 0 2003 1000 114 0 4 2N3904 184148 10V 9 FROM J106 C126 8121 8195 crassa 4 2109 PIN 470uF CR102 820 8 9C 184148 A228 A227 1104 3 3K A108 104146 0152 L 2 2120 58 270uH 10K AUF MET FILM 5 5 M R213 20V 58M COAX Ci20 assy 100K 8 a CAN 2051 gt R132 u FR DETECTOR Tae uev i A110 5 4109 C T L CM 1 a AUDIO c202 203904 Hio Somi SYNCH LED aL 22uF 160uF 10v0 d 12 444 ic CR100 cass 9309 C253 gt R107 iN4348 2 7K O1uF von 22897 20 100uF 0407 A129 L 123 24101 C 1
192. y RL100 is controlled by Q106 and when energized Q105 provides 10 dB of gain when selected The preamplifier output sent through the master low pass before reaching the input of the first mixer The master low pass filter consists of the following components C209 C220 C221 C222 C223 C224 C225 L164 L165 and L166 At the first mixer the incoming signal is mixed with the output of the synthesizer VCO to create a 45 MHz interme diate frequency IF signal The conversion is accom plished by a standard level double balanced mixer to provide a high dynamic range The output of the mixer is amplified by Q104 J310 alow noise high dynamic range J fet amplifier to insure adequate receiver sensitivity This stageis tunable by adjusting the variable capacitor C197 The output is connected to L140 a matching transformer which passes the signal to the input of the 45 MHz crystal filter section which is composed of the following elements C258 C162 C164 XF100 and XF101 After leaving the crystal filtersection the signal passes thr ugh a capacitive matching network formed by C178 C179 and L138 The network is tuned by C178 and C179 After this the signalis divided into two parts with part going to a J Fet amplifier Q103 J310 preceding the FM detector circuitry and the other part to Q102 an AGC d dual gate mosfet amplifier circuit which is followed by the image reject mixer circuitry The FM detector is comprised of the 0100 MC33
193. y tuning adjustment Transistors Q137 Q141 Q139 and associated components provide buffering and reverse isolation For the outer loop PLL1 the 35 MHz is routed through capacitor C363 coax W1 and capacitor C172 to U109 Pin 8 For PLL2 and PLL3 the reference frequency is divided by 10 from 35 MHz to 3 5 MHz by U130 This 3 5 MHz reference signal is coupled to PLL2 U126 Pin 1 through capacitor C316 and to PLL3 U125 Pin 1 through C314 The 3 5 MHz signalis also the reference signal for the optional VHF con verter This signal path will be discussed later Additionally the 35 MHz reference is used each loop to mix or translate signals to appropriate frequencies In the outer loop U117 uses the 35 MHzreference to translate the output of the middle loop from 6 0 MHz to 41 0 MHz Similarily in PLL2 and PLL3 0121 and 0128 use 70 MHz to translate signals The 70 MHz is obtained by doubling the frequency of the 35 MHz reference The 35 MHz to 70 MHz doubler circuit consists of diode CR124 variable coil L154 transistor Q138 and associated components INNER LOOP PLL3 is the inner most loop and provides the smallest size and finest resolution Its main component is U125 MC145157 U125 consists of 2 programmable dividers and a phase comparator The programmable dividers are programmed by the uP through the serlal data bus The reference signal at Pin 1 is divided by R3 The VCO signal at Pin 8 is divided N3 Since R

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