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Technical supplement

1. 50001 9900063 NO190173 1011 1014 H lt 13002 FT 847 Technical Suppleme
2. Grasp the chip on both sides with tweezers and gently twist the tweezers back and forth to break the adhesive bond while alternate ly heating each electrode Be careful to avoid peeling the foil traces from the board Dispose of the chip when removed 1 After removing the chip use the copper braid and soldering iron to wick away any excess solder and smooth the land for installation of the replacement part 847 Technical Supplement Chip Component Information Installing a Replacement Chip As the value of some chip components is not indicated on the body of the chip be careful to get the right part for replacement Apply a small amount of solder to the land on one side where the chip is to be installed Avoid too much solder which may cause bridging shorting to other parts Hold the chip with tweezers in the desired position and apply the soldering iron with a motion line as indicated by the arrow in the diagram below Do not apply heat for more than 3 seconds Remove the tweezers and solder the electrode on the other side in the manner just described 1 5 FT 847 Technical Supplement ee Exploded View amp Miscellaneous Parts RA0070000 Lot 3 54000045 CASE LEG 4pcs TOR GASE E SP NET Description ______ YAESU PAN HEAD SCREW M2 6x6 Sp ee E ECE BINDING
3. 51 1 5J 1 BPE Ug Sa costae 5K 1 lt ee a ee ee Cut out the label at the right and place it behind the 847 clear plastic window in the spine of a binder Technical Supplement RE PWR RF AMP SRCH Q PHONE Cor MONI O D SE 12 Ke RF a e o off 2 J This manual provides technical information necessary for servicing the Yaesu FT 847 HF amp V UHF Band Transceiver It does not include in formation on installation and operation which are described the FT 847 Operating Manual provided with the transceiver or on accessories which are described in their manuals The FT 847 is carefully designed to allow the knowledgeable operator to make nearly all ad justments required for various station conditions modes and operator preferences simply from the controls on the panels without opening the case of the transceiver The FT 847 Operating Manu al describes these adjustments plus certain in ternal settings Servicing this equipment requires expertise in handling surface mount chip components At tempts by unqualified persons to service this equipment may result in permanent damage not FT 847 Technical Supplement Introduction covered by warranty For the major circuit boards each side of the board is ident
4. shop EE a 96069 85060 4 Besoen S ck en 66067 BLOE en 50 0 Lang 020 7 1307 590 59062 3060 13017 18 27 29 31 VHF RX IF Sensitivity T3001 8 809 4 4 Ei RF Unit Alignment Points T3011 12 14 15 RX IF Sensitivity T3006 07 VHF RX IF Sensitivity 347 Technical Supplement V U PA Unit Alignment Points TP4002 VHF PA Idling Current Ammeter lead 0 3 0 03 _ 4001 VHF PA Idling Current Ammeter ke VR4004 144 MHz TX Adjust J4003 Pin 3 144 MHz TX Adjust 4 26992 TPO 4026 5 4027 5 amp 004 5 180 4030 321 9 DE woen J 407 Cape VK gt gt 6011 14019 3 T ceo 9 Q t4028 recoos 185 002 3 55454 003 04013 No e 2005 4 Coen 2 223 a E ceog 1 Cat 4004 UHF PA Idling Current Amm TP4003 UHF PA Idling Current Ammeter TC4004 430 MHz TX Adjust 44007 Pin 3 430 MHz TX Adjust DC Voltmeter TC4005 430 MHz TX Adjust 25099 34008 9 24105 R4020 Leos C4043 6050 CLD 16 Ammeter lead 0 3 0 03 TC4002 144 MHz TX Adjust ling Cur
5. Press the switch and without closing the Key line adjust VR5002 for 1 5 A 40 15 on the ammeter Then remove the ammeter and reinstall the jumper connector at J5007 Final section Idling Current Adjustment O Connect the 50 Q dummy load to the HF an tenna jack and remove the jumper between TP5001 and TP5002 Connect the ammeter be tween TP5001 lead and TP5002 lead Tune the transceiver to 14 005 MHz and select the CW mode Press the switch and without closing the Key line adjust VR5003 for 0 42 A 0 025 A on the ammeter Then remove the amme ter and reinstall the jumper between TP5001 and TP5002 CM coupler balance O Tune the transceiver to the 50 MHz high band edge different in each country and connect the 50 Q dummy load to the 50MHz antenna jack Preset the RF PWR control fully clockwise and select the FM mode Connect the DC volt FT 847 Technical Supplement SSS Alignment meter between J5001 s pin 1 and chassis ground Key the transmitter and with no microphone input adjust TC5001 for minimum indication on the DC voltmeter V U PA Unit Adjustments VHF PA section Idling Current Adjustment Tune the transceiver to 145 995 MHz and se lect the CW mode Connect the 50 dummy load to the 144MHz antenna jack Remove the jumper between TP4001 and TP4002 and con the ammeter between 4001 7 7 lead and TP4002 lead
6. SSB CW AM FM 20 pV ZuM 2 pV 1 0 5 pV 500 kHz 1 8 MHz 1 8 28 MHz 28 30 MHz 50 54 MHz 144 430 MHz Better than 60 dB Better than 60 dB SSB CW 2 2 kHz 4 5 kHz CW N 0 5 kHz 2 0 kHz Optional YF 115C installed AM 9 kHz 20 kHz 2 2 kHz 4 5 kHz FM 15 kHz 30 kHz FM N 9 kHz 20 kHz At least 1 5 Q into 8 W 10 THD 40 160 0 25 pV 0 20 pV 0 16 pV Specifications are subject to change in the interest of improvement without notice or obligation Specifications are guaranteed only within Amateur bands 1 2 847 Technical Supplement tinguishing features of common chip compo nents Capacitors Resistors 3 H A Indicated Letters 12345672090 Unit mm FT 847 Technical Supplement Chip Component Information The diagrams below indicate some of the dis Unit mm Unit mm 34 28 19 Marking 100 222 473 Examples 100 100 222 2 2 0 473 47 1 3 Chip Component Information Replacing Chip Components Chip components are installed at the factory by a series of robots The first one places a small spot of adhesive resin at the location where each part is to be installed and later robots handle and place parts using vacuum suction For single sided boards solder paste is applied and the board is then baked to harden the resin and flow the solder For double sided boards no solder paste is applied
7. E z O Select alignment menu RX GAIN and select the CW mode Inject a signal of level 3 dBu no modulation and adjust the MEM VFO CH control for just 1 segment indication on the S meter Then press the MCK W key HF Band RX Gain Adjustment Connect the signal generator to the HF anten na jack and tune the transceiver and RF sig nal generator to 28 995 MHz O Select alignment menu and select the USB mode Inject a signal of level 0 dBp no modulation and adjust the MEM VFO CH control for just 1 segment indication on the S meter Then press the MCKIW key O Tune the transceiver and signal generator to 14 005 MHz and select the USB mode In ject a signal of level 0 dBp no modulation 3 7 a ee Alignment and adjust the MEM VFO CH control for just 1 segment indication on the S meter Then press the key Tune the transceiver and RF signal generator to 3 505 MHz and select the USB mode Inject a signal of level 3 no modulation and adjust the control for just 1 seg ment indication on the S meter Then press the key SHIFT Control Center Preset 3 Preset the SHIFT control to the 12 o clock po sition Select alignment menu SFT CTR and press the key After this preset proce dure do not turn the SHIFT control If you acci dentally turn it repeat the above proc
8. 10 500 MHz 36 995 MHz 22 000 MHz 53 995 MHz adjust T2004 37 000 MHz confirm 75 995 MHz adjust T2005 54 000 MHz confirm adjust T2002 confirm adjust T2003 confirm confirm VCV check 7 Connect the DC voltmeter to TP2002 and re ferring to table below tune the transceiver to each frequency then confirm that the required voltage is present for UHF VCO VCV check O Connect the DC voltmeter to TP2003 and re ferring to table below tune the transceiver to each frequency Confirm that the required voltage is present UHF VCO check less than 7 0V 511 000 MHz 5 847 Technical Supplement PA Unit Adjustments HF Pre drive section Idling Current Adjustment 1 Connect the 50 Q dummy load to the HF an tenna jack and remove the jumper connector at J5006 Connect the ammeter to J5006 pin 1 4 lead pin 2 lead Tune the transceiver to 14 005 MHz and select the CW mode c Press the switch and without closing the Key line adjust VR5001 for 0 25 A 0 025 A on the ammeter Then remove the amme ter and reinstall the jumper connector at J5006 Drive section Idling Current Adjustment 1 Connect the 50 Q dummy load to the HF an tenna jack and remove the jumper connector at J5007 Connect the ammeter to J5007 pin 1 lead pin 2 lead Tune the transceiver to 14 005 MHz and select the CW mode
9. 2 V on the DC voltmeter TX DDS Adjustment 1 Connect the RF millivoltmeter to TP1004 and adjust T1020 for maximum indication on the RF millivoltmeter RX DDS Adjustment O Connect the RF millivoltmeter to TP1005 and adjust T1021 for maximum indication on the RF millivoltmeter FM IF Adjustment O Connect the 50 Q dummy load to the HF an tenna jack and connect the RF millivoltmeter to TP1005 Select the FM mode Key the transmitter and adjust T1012 T1014 for maximum indication on the RF millivoltmeter 1 Replace the RF millivoltmeter with the fre quency counter Key the transmitter and ad just T1016 for 45 580 MHz 100 Hz on the frequency counter Carrier Frequency Adjustment Remove the coaxial plug from J1003 and con nect the frequency counter across the socket Select the CW mode 1 Key the transmitter and adjust TC1002 for 45 580 MHz 10 Hz on the frequency counter Replace the frequency counter with the RF mil livoltmeter and key the transmitter and ad just T1002 for maximum indication on the RF millivoltmeter 3 4 1 Remove the RF millivoltmeter and replace the plug into J1002 RX IF Sensitivity Cl Preset the RF control fully clockwise Remove the coaxial plug from J1001 and connect the signal generator across the socket and inject 0 dBm at 45 705 MHz no modulation Connect the DC voltmeter to TP1048 1 Adjust T1005 T1008 T1015 and T1017 T1019 for minimum indication on
10. Band SSB S9 Adjustment O Connect the signal generator to the 144MHz antenna jack and tune the transceiver to 145 995 MHz Select alignment menu SSB S9 select the USB mode and preset the RF control fully clockwise Inject a signal of level 25 dBp no modulation then press the MCK W key 144 MHz Band SSB Full Scale Adjustment Connect the signal generator to the 144MHz antenna jack and tune the transceiver to 145 995 MHz Select alignment menu SSB FULL and inject signal of level 85 no modulation Then press the MCK W key 144 MHz Band RX Gain Adjustment 3 Connect the signal generator to the 144MHz antenna jack and tune the transceiver to 145 995 MHz FT 847 Technical Supplement meter Then press the MCK W key 430 MHz Band RX Gain Adjustment 1 Connect the signal generator to the 430 2 antenna jack and tune the transceiver to 439 995 MHz Select alignment menu RX GAIN and select the USB mode Inject a signal of level 6 dBu no modulation and adjust the MEM VFO CH control for just 1 segment indication on the S meter If the hexadecimal data on the transceiv er s display is less than 40H turn the MEM VFO CH control for just 40H indication on the display Then press the MCK W key 50 MHz Band RX Gain Adjustment ia 1 Connect the signal generator to the 50 2 antenna jack and tune the transceiver to 51 995 MHz for vers A C D H or 50 295 MHz for vers B
11. HEAD Screw 02010007 SCREWMS 6 63 031910007 4 R4150130 HANDLE HOLDER 2pes 549449494064 44306001 6 HEXHEAD BOLTHSMadieNT LS p A P1090547 CONNECTOR 9 M2090017 e BINDING HEAD SCREW M3x18 020318001 2080017 Lot 8 BINDING HEAD SCREW M3x20NI Lot 8 FAN Non designated parts are available only as part of a designated assembly gt SO 7113 3 VIU PA Unit ao 5000206 D GUARD P1090352 CONNECTOR 3pcs PA Unit AAD M2090023 Op M2090029 Lot 16 FAN 0065800 0063000 R RA006300A Lot 4 P UBBER HOLDER SP RUBBER KNOB MODE 0065100 Display Unit 1 4 8 KNOB POW Mic Unit DSP ua OP SPEAKER RA0065200 Phone Jack Unit KNOB MOX Sg RF Unit 30 Lot 4 0059700 RUBBER KNOB TU RA005970A Lot 5 005970 Lot 17 RA006180A CHASSIS 0061808 Lot 6 ANELASSA PLL Unit AF CNTL Unit RA0070100 RA007010A Lo 3 BOTTOM CASE RA006320A Lot 4 RUBBER KNOB ME RA0063100 RA006310A Lot 4 RUBBER KNOB KEY 0072400 COIL SPRING RA0065500 ENCODER KNOB 2 0063400 0066500 06340 Lot 4 06650 Lot 5 RA0065600 RUBBER RING VOLUME KNOB RUBBER
12. KNOB CL RNOB OUT 4pcs oon SHEET SAT 54000027 KNOB MAIN ASS Y SHEET SAT Ra0065300 CASE LEG 2pcs ROS 39 KNOB SHUTTLE 89145630 6 9 0 3100700 R3100700A Lot 12 FOOT 2 5 FT 847 Technical Supplement 0512 DC12V F412R 12MB 32 DC12V JF0625S1M 050 DC12V JF0625S1M 050R1 DC12V WIRE ASSY WIRE ASSY WIRE ASSY WIRE ASSY WIRE ASSY WIRE ASSY WIRE ASSY WIRE ASSY WIRE ASSY WIRE ASSY WIRE ASSY WIRE ASSY WIRE ASSY WIRE ASSY WIRE ASSY WIRE ASSY WIRE ASSY WIRE ASSY WIRE ASSY WIRE ASSY WIRE ASSY WIRE ASSY WIRE ASSY WIRE ASSY WIRE ASSY WIRE ASSY 0020 WIRE ASSY 0020 WIRE ASSY 0021 WIRE ASSY 0022 WIRE ASSY 0022 ASSY 0023 WIRE ASSY 0023 WIRE ASSY P 0025 WIRE ASSY 0026 WIRE ASSY 0027 WIRE ASSY 0028 WIRE ASSY 0028 WIRE ASSY 0028 WIRE ASSY FM MDR MI FM MDR MI FM MDR MI 020 0291 1179 1179 A1179 A1179 1179 1179 1179 1179 1179 1179 1179 RED 280 400 V5 5 BLK 280 360 V5 5 GRA 280 TMP TMP A1179 A1179 1179 1179 1179 A1179 A1179 A1179 A1179 1179 1179 1179 1179 1179 BRN 330 210 BLK 340 BLK 360 200 1179 1179 1179 BLK 60 RED 60 ORG 120 TMP TMP GRN 110 TMP TMP BLK 140 TMP TMP YEL 140 TMP TMP ORG 150 TMP TMP GRA 150 T
13. O Disconnect the 50 Q dummy load and connect the 150 Q dummy load or three 50 Q loads in parallel to the HF antenna jack Key the trans mitter and compare the current with the above step If the ammeter reading is more than 4 0 A lower than that measured in the previous step adjust 1001 for 4 0 0 2 A lower than the previous step If the ammeter read 3 6 ing is less than 4 0 A below that measured in the previous step adjust VR3009 for a read ing 4 0 A 0 2 A lower than that of the previ ous step TX and RX Adjustments Alignment Menu Adjustments 144 MHz Band FM S1 Adjustment O Connect the signal generator to the 144MHz antenna jack and tune the transceiver to 145 995 MHz Select the FM mode Select alignment menu FM S1 and inject a 6 4 signal 3 5 kHz deviation of a 1 kHz tone Then press the MCK W key 144 MHz Band FM Full Scale Adjustment 3 Connect the signal generator to the 144MHz antenna jack and tune the transceiver to 145 995 MHz Select the FM mode Select alignment menu FM FULL and inject 20 0 dBy signal 3 5 kHz deviation of a 1 kHz tone Then press the key 144 MHz Band Scan Discriminator Center Stop Adjustment Connect the signal generator to the 144MHz antenna jack and tune the transceiver to 145 995 MHz Select the FM mode Select alignment menu DISC L and inject a signal at 145 992 MHz level 20 0 3 5 kHz deviation of a 1 kHz ton
14. Press the switch and without closing the Key line adjust VR4002 for 0 3 A 0 03 A on the ammeter Then remove the ammeter and reinstall the jumper between TP4001 and TP4002 UHF PA section Idling Current Adjustment Tune the transceiver to 439 995 MHz and lect the CW mode Connect the 50 Q dummy load to the 430MHz antenna jack Remove the jumper between TP4003 and TP4004 and con nect the ammeter between TP4003 lead and TP4004 lead Press the switch and without closing the Key line adjust VR4001 for 0 3 A 0 03 A on the ammeter Then remove the ammeter and reinstall the jumper between TP4003 and TP4004 TX and RX IF Adjustments Reference Output Adjustment O Connect the RF millivoltmeter to TP1002 and adjust T1010 and T1007 for maximum indica tion on the RF millivoltmeter O Replace the RF millivoltmeter with the fre quency counter and adjust TC1001 for 45 25 MHz 10 Hz on the frequency counter 1 Remove the coaxial plug from J1002 and nect the RF millivoltmeter across the socket 3 3 Alignment ___ Adjust T1003 for maximum indication on the RF millivoltmeter O Remove the RF millivoltmeter and replace the plug into J1002 TX Local Adjustment Connect the 50 Q dummy load to the HF an tenna jack and connect the DC voltmeter to TP1003 Select the CW mode O Key the transmitter and adjust T1009 for 3 0 V 0
15. but the board is baked or exposed to ultra violet light to cure the resin before dip soldering In our laboratories and service shops small quantities of chip components are mounted man ually by applying a spot of resin placing the com ponents with tweezers and then soldering by very small dual streams of hot air without phys ical contact during soldering We remove parts by first removing solder using a vacuum suction iron which applies a light steady vacuum at the iron tip and then breaking the adhesive with tweezers Special vacuum desoldering equipment is recommended if you expect to do a lot of chip replacements Otherwise it is usually possible to remove and replace chip components with only a tapered temperature controlled solder ing iron a set of tweezers and braided copper solder wick Soldering iron temperature should be below 280 C 536 F 1 4 Precautions for Chip Replacement O Do not disconnect a chip forcefully or the foil pattern may peel off the board O Never re use a chip component Dispose of all removed chip components immediate ly to avoid mixing with new parts O Limit soldering time to 3 seconds or less to avoid damaging the component and board Removing Chip Components 7 Remove the solder at each joint one joint ata time using solder wick whetted with nona cidic fluxes as shown below Avoid applying pressure and do not attempt to remove tin ning from the chip s electrode
16. the MENU key after a setting is made stores the entry To exit the alignment routine press POWER After performing the system align ment in its entirety individual settings can be re turned to and adjusted should the need arise Read each step to determine if the same test equipment used in the previous step will be re quired If not remove the test equipment except dummy load and wattmeter if connected be fore proceeding Correct alignment requires that the ambient temperature be the same as that of the transceiver and test equipment and that this temperature be held constant within 20 30 C 68 86 F If the transceiver is brought into the shop from hot or cold air it should be allowed time for thermal equalization with the environ ment before alignment Alignments must only be made with oscillator shields and circuit boards firmly affixed in place Also the test equipment must be thoroughly warmed up before begin ning Note Signal levels in dB referred to in alignment are based 0 0 5 pV Table Note DC voltages should be within 10 of those listed in the voltage tables PLL Adjustments HF VCO VCV adjustment Connect the DC voltmeter to TP2001 and re ferring to table below tune the transceiver to each frequency then confirm or adjust the list ed component for the required voltage HF VCO Adjustment Tune to Adjust Confirm for 10 495 MHz adjust T2001 0 100 MHz 21 995 MHz
17. 0 Q dummy load connected to the 144MHz antenna jack connect the AF generator to the MIC jack Tune the transceiver to 145 005 MHz and select the USB mode 1 Select alignment menu ALC 1 and inject no microphone input Key the transmitter then press the key Now adjust the MEM VFO CH control for a hexadecimal data 4 indication on the display Select alignment menu ALC 9 and inject 1 kHz tone signal of level 3 mV to the MIC jack Key the transmitter and adjust the MIC con trol for just 1 segment indication on the ALC meter Without touching the setting of the MIC con trol inject a 1 kHz tone at 10 mV to the MIC jack Then press the key 144 MHz Band TX Adjustment O With the inline wattmeter and 50 Q dummy load connected to the 144MHz antenna jack connect the AF generator to the MIC jack pin 8 mic input pin 7 ground Tune the trans ceiver to 145 995 MHz and select the USB mode Preset the MIC control to the 1 o0 clock position 1 Select alignment menu TX GAIN and inject a 1 kHz tone at 1 mV level to the MIC jack Key the transmitter and adjust the MEM VFO CH control for 25 W on the external wattmeter If the hexadecimal data on the transceiver s dis play is less than turn the MEM VFO control for just 8FH indication on the display 430 MHz Band TX Adjustment O With the inline wattmeter 50 dummy load connected to the 430MHz antenna jac
18. 10 W on the external wattmeter O Replace the 50 Q dummy load with a 100 Q dummy load two 50 loads in parallel con nected to the HF antenna jack Key the transmitter and press the key Replace the 100 Q dummy load with the 50 0 dummy load connected to the HF antenna jack and select alignment menu SWR 3 0 O Key the transmitter and adjust the RF PWR control for 50 W on the inline wattmeter O Replace the 50 Q dummy load with the 150 Q dummy load or three 50 Qs in parallel to the HF antenna jack CI Key the transmitter and press the MCK W key FT 847 Technical Supplement Deviation Adjustment 1 With the 50 dB attenuator or 50 Q dummy load and sampling coupler and linear detector nected to the 144MHz antenna jack connect the AF generator to the MIC jack pin 8 mic input pin 7 ground Tune the transceiver to 145 995 MHz and select the FM mode g Inject a 1 kHz tone at 15 mV level Key the transmitter and adjust VR1004 for 4 5 kHz deviation on the linear detector 7 Select the 88 5 Hz default subaudible tone and activate CTCSS Encode operation Key the transmitter and adjust VR1003 for 0 7 kHz deviation on the linear detector Speech Processor Adjustment 1 With the inline wattmeter and 50 Q dummy load connected to the 144MHz antenna jack connect the AF generator to the MIC jack pin 8 mic input pin 7 ground Tune the trans ceiver to 145 995 MHz s
19. 20 1V at least 0 4V 6 5 0 1 at least 0 4V 6 5 0 1 at least 0 4V 847 Techni VR3002 430 MHz TX Adjust VR3003 144 MHz TX Adjust 5 28 VHF RX IF Sensitivity TC3001 03 04 430 MHz TX Adjust VR3004 50 MHz TX Adjust 23007 H VR3005 06 TX Adjust j 2034 VR3006 83007 EI EI EI vR3003 R268 w 3006 R3153 Kat KE AIS VR3004 R3157 83 56 VR300S VR3007 08 09 AFP Adjust 3046 ay T3005 08 10 144 MHz TX Adjust 3076 303 EN 1 3027 3053 H a 93002 93058 02059 H 3024 8 8 8 8 a EI 06 Ee K 14 ET E T3003 09 13 16 50 MHz TX Adjust 26087 27 E se ESE BAAS e E 55060 94067 EE 22 2 5301 15060 33013 soto D3091 Go o T3019 21 25 28 VHF C3279 OT Loc ah hep ALP cece 3 Lo esoe ote Eson ODC 790 25060 5 T3020 g 457 1608 7 25057 8 gt
20. 5 402001 og are lt zou Le 10168 1055 Ces Be ier 12001 02 VCV Adjust mD2002 2063 2725 2 211 at 1 be 2 620008 705 E WE nzes KT E T2003 04 HF VCO VCV Adjust gt 8 18 2005 VCV Adjust la SCH el RAD NP TTT 101 Ga JH 9 get 2076 29274 3 _ 5 191 d B TUTTI 2 5 92815 92017 24 222 91016 920 82013 29 5 2 Ki c2042 00 R2042 Pa 88 104069 T 209s GD LTH 8 40204680 HF VCO Adjustment 0 100 MHz adjust T2002 6 5 6 5 6 5 53 995 MHz adjust T2004 37 000 MHz 75 995 MHz adjust T2005 54 000 MHz 6 5 212 Leen 2212629 21 2 gt Ze SE 2131 QG 10 jew FA 9291028 07073 820513 982143 a ei 1055 we 02031 R2012 2162 5 2 mern CH 2142 D Lei 92922 91013 2933 R20 Adjust DC Voltmeter TP2003 UHF VCO VCV Check DC Voltmeter 20 Adjustment UHF VCO check ust Confim ust T2001 fo 6 5 0 1 at least 0 4V 6 5V 0 1V at least 0 4V 6 5V
21. Hz for French version or 51 995 MHz for other versions and select the FM mode Key the transmitter and adjust VR3004 for 100 W on the external wattmeter 3 5 2 Alignment HF TX Adjustment With the inline wattmeter 50 Q dummy load connected to the HF antenna jack tune the transceiver to 3 505 MHz and select the FM mode Key the transmitter and adjust VR3006 for 100 W on the inline wattmeter Tune the transceiver to 1 830 MHz and select the FM mode Key the transmitter and adjust VR3005 for 100 W on the inline wattmeter AFP adjustment 1 Preset VR3007 VR3008 and VR3009 fully clockwise and connect the ammeter between the transceiver s 13 8VDC connector and the DC power supply C Tune the transceiver to 145 995 MHz and se lect the CW mode with no connection to the 144MHz antenna jack Key the transmitter and adjust VR1001 for 8 0 A 0 1 A on the ammeter 1 Tune the transceiver to 439 995 MHz se lect the CW mode with no connection to the 430MHz antenna jack Key the transmitter and confirm the current on the ammeter If over 8 0 A on the ammeter adjust VR1001 for 8 0 A 0 1 A on the ammeter If under 8 0 A on the ammeter adjust VR3007 for 8 0 A 0 1 A on the ammeter O Connect the 50 Q dummy load to the HF an tenna jack Tune the transceiver to 14 005 MHz and select the CW mode Key the transmitter and make a note of the current on the ammeter
22. MP A1179 GRN 500 TMP TMP RED 290 TMP TMP RED 310 TMP TMP RED 290 TMP TMP A1179 A1179 A1179 A1179 T9206706A 79318054 79318055 79311201 19206707 T9206707A T9206708 T9206708A 192067098 T9206709C 19206711 T9206711A 79206712 206712 79318041 79318042 79318043 79318056 79206716 19206716 T9206716B 0001 ROTARY ENCODER 0002 ROTARY SWITCH 0001 FT 847 Technical Supplement Alignment Introduction and Precautions The following procedures cover adjustments that are not normally required once the trans ceiver has left the factory However if damage occurs and some parts subsequently are replaced realignment may be required If a sudden prob lem occurs during normal operation it is likely due to component failure realignment should not be done until after the faulty component has been replaced We recommend that servicing be performed by authorized Yaesu service technicians who are experienced with the circuitry and fully equipped for repair and alignment If a fault is suspected contact the selling dealer for instruc tions regarding repair Authorized Yaesu service technicians have the latest modification informa tion and realign all circuits and make compete performance checks to ensure compliance with the factory specifications after repairs Those who do undertake any of the following alignments are cautioned to proceed at their own risk Problems caus
23. YAESU FT 847 amp Band Transceiver Technical Supplement VERTEX STANDARD CO LTD 4 8 8 Nakameguro Meguro Ku Tokyo 153 8644 Japan VERTEX STANDARD US Headquarters 17210 Edwards Rd Cerritos CA 90703 U S A international Division 8350 N W 52nd Terrace Suite 201 Miami FL 33166 U S A YAESU EUROPE B V P O 75525 1118 ZN Schiphol The Netherlands YAESU UK LTD Unit 12 Sun Valley Business Park Winnall Close Winchester Hampshire SO23 OLB U K YAESU GERMANY GmbH Am Kronberger Hang 2 D 65824 Schwalbach Germany VERTEX STANDARD HK LTD Unit 5 20 F Seaview Centre 139 141 Hoi Bun Road Kwun Tong Kowloon Hong Kong Contents E 1 1 e E 1 2 Chip Component Information 1 3 Mechanical Details Exploded Views amp Mechanical 5 2 1 Alignment 3 1 Block Interconnection 4 1 PCB Diagrams amp Parts List AF CNTE sn eee ene 5A 1 BE OF o E 5B 1 5C 1 50 1 5 1 DSP e 5 1 Eesen 5G 1 SSB Filtet 1 2 BR EE 5H 1 PhoneJack A
24. band Power Re adjustment for French version OI With the inline wattmeter and 50 0 dummy load connected to the 50MHz antenna jack tune the transceiver to 50 295 MHz and select the FM mode O Key the transmitter and adjust VR3004 for 10 W on the inline wattmeter 1 9 MHz band Power Re adjustment for Belgian version With the inline wattmeter and 50 Q dummy load connected to the HF antenna jack tune the transceiver to 1 850 MHz and select the FM mode 1 Key the transmitter and adjust VR3005 for 10 W on the inline wattmeter 3 11 nn Alignm geg 2 06 A 05 TP1004 TX DDS Adjust Millivoltmeter max T1020 TX DDS Adjust T1021 RX DDS Adjust 5 5 5 5 ae O fe SE lot 1005 RX DDS Adjust RF max C179 cues GER 223 8 1 26 VR1002 Carrier Frequency Adjust P 11018 09 RX IF Sensitivity 1048 50 MHz RX IF Sensitivity DC Voltmeter mb RX IF Sensitivity DC Voltmeter min re E 248 11015 17 RX IF Sensitivity T1009 TX Local Adjust TP1003 TX Local Adjust DC Voltmeter 3 0 0 2 T1003 07 10 Reference Output Adjust TP1002 Reference Output Adjust DC Voltmeter minimum indication Frequency Counter 45 250 MHz 10 Hz TP1049 Noise Blanker Adjust DC Voltmeter min S T1004 06 Noise Blanker Adju
25. control for 100 W indication on the external wattme ter Then press MCKIW key Select alignment menu PWR 50 Key the transmitter and adjust the RF PWR control for 50 W indication on the external wattme ter Then press the key 1 Select alignment menu PWR 20 Key the transmitter and adjust the RF PWR control for 20 W indication on the external wattme ter Then press the MCK W key 1 Select alignment menu PWR 10 Key the transmitter and adjust the RF PWR control for 10 W indication on the external wattme ter Then press the MCK W key 144 430 MHz Band PO Meter Adjustment Connect 50 Q dummy load to the 144MHz antenna jack Tune the transceiver to 145 995 MHz and select the FM mode O Select alignment menu PWR 100 Rotate the CH control to select the hexadeci mal data value of FF Select alignment menu PWR 50 Key the transmitter and adjust the RF PWR control for 50 W indication on the external wattme ter Then press the key Select alignment menu PWR 20 Key the transmitter and adjust the RF PWR control for 20 W indication on the external wattme ter Then press the key Select alignment menu PWR 10 Key the transmitter and adjust the RF PWR control 847 Technical Supplement Alignment for 10 W indication on the external wattme ter Then press the key ALC Meter Adjustment With the inline wattmeter and 5
26. e Then press the MCKIW key Select alignment menu DISC H and inject a signal at 145 998 MHz level 20 0 dBu 3 5 kHz deviation of a 1 kHz tone Then press the key 144 MHz Band SQL Threshold Adjustment Tune the transceiver to 145 995 MHz and the select the FM mode Select alignment menu SQL TH L and in ject no RF input Then press the MCK W key Press the key SQL TH H will appear 847 Technical Supplement Alignment Select alignment menu RX GAIN and select the USB mode Inject a signal of level 6 dBy no modulation and adjust the MEM VFO CH control for just 1 segment indication on the S on the display and apply no RF input Then press the MCK W key 144 MHz Band SQL Tight Adjustment 1 Connect the signal generator to the 144MHz antenna jack and tune the transceiver to 145 995 MHz Select the FM mode 1 Select alignment menu SQL TI L and inject signal at 145 995 MHz level 0 43 5 kHz deviation of a 1 kHz tone Then press the key 1 Press the A amp B key 1501 display and inject a signal at 145 995 MHz level 0 3 5 kHz deviation of a 1 kHz tone Then press the MCKIW key 144 MHz Band SSB S1 Adjustment 1 Select alignment menu SSB S1 and tune the transceiver to 145 995 MHz Select the USB mode preset the RF control to the 2 0 clock position and inject no RF input Then press the MCKIW key 144 MHz
27. ed by unauthorized attempts at realignment are not covered by the warranty policy Also Yaesu must reserve the right to change circuits and alignment procedures in the interest of improved performance without noti fying owners Under no circumstances should any alignment be attempted unless the normal function and operation of the transceiver are clearly understood the cause of the malfunction has been clearly pinpointed and any faulty com ponents replaced and the need for realignment determined to be absolutely necessary The following test equipment and thorough familiarity with its correct use is necessary for complete realignment Correction of problems caused by misalignment resulting from unautho rized adjustments made with improper test equip ment is not covered by warranty Although most FT 847 Technical Supplement steps do not require all of the equipment listed the interaction of some adjustments may require that more complex adjustments be performed af terwards Do not attempt to perform only a sin gle step unless it is clearly isolated electrically from all other steps Rather have all test equipment ready before beginning and follow all of the steps in a section in the order they ar presented Required Test Equipment Digital DC Voltmeter high Z 1 O DC Ammeter O RF Millivoltmeter O AC Voltmeter O RF Standard Signal Generator w calibrated output and dB scale 0 dBp 0 5 pV O AF Signal G
28. edure for pre setting the SHIFT control RX SSB Carrier Point Adjustment Tune the transceiver to 145 995 MHz Select alignment menu RXC PNT and inject no RF input O Adjust the MEM VFO CH control for identical sound of the noise from the speaker while switching between USB and LSB Then press the key TX SSB Carrier Point Adjustment O Connect the 50 Q dummy load to the 144MHz antenna jack and connect the ammeter be tween the transceiver s 13 8VDC connector and DC power supply Tune the transceiver to 145 995 MHz and select alignment menu TXC USB O Set regular Menu 92 and 93 to 0 if they are not already set to that value O Key the transmitter and adjust the MEM VFO CH control for minimum indication on the ammeter Select alignment menu TXC LSB Key the transmitter and adjust the MEM VFO CH con trol for minimum indication on the ammeter 3 8 HF Band PO Meter Adjustment Connect the 50 Q dummy load to the HF an tenna jack Tune the transceiver to 14 005 MHz and select the FM mode 1 Select alignment menu PWR 100 Key the transmitter and adjust the RF PWR control for 100 W indication on the external wattme ter Then press the key 1 Select alignment menu PWR 50 Key the transmitter and adjust the RF PWR control for 50 W indication on the external wattme ter Then press the key O Select alignment menu PWR 20 Key the transmitter and adjust
29. elect the USB mode and leave the PROC switch off for now 1 Inject a 1 kHz tone at 1 mV level Key the trans mitter and adjust the MIC control for 12 5 W on the wattmeter O Switch PROC on key the transmitter and ad just VR1002 for 25 W on the wattmeter Carrier Level Adjustment Connect the 50 Q dummy load to the an tenna jack Tune the transceiver to 1 910 MHz for vers A H 1 850 MHz for vers B C D or 1 840 MHz for vers E select the CW mode and set PROC off Select the TX meter to read ALC Preset VR1006 fully clockwise 1 Connect the AF generator to the MIC jack pin 8 mic input pin 7 ground Select the AM FT 847 Technical Supplement Alignment mode and inject a 1 kHz tone at 1 mV level to the MIC jack Key the transmitter and adjust VR1005 for at least a 5 segment indication on the ALC meter Carrier Balance Adjustment O Connect the RF attenuator 50 Q dummy load and sampling coupler and spectrum an alyzer to the 144MHz antenna jack Tune the transceiver to 145 995 MHz select the USB mode and inject no microphone input O Key the transmitter and adjust VR1007 for minimum carrier leakage should be at least 45 dB below a carrier transmitted on the same frequency as indicated on the analyzer Select the LSB mode and again inject no mi crophone input Key the transmitter and con firm that the carrier leakage is at least 45 dB down as indicated on the analyzer 50 MHz
30. enerator with calibrated output O Frequency Counter Two 50 Dummy Loads 150 250 watts 150 0 Dummy Load 150 watts O In Line Wattmeter 150 250 watts 50 0 O Linear Detector O RF Attenuator 150 watts 40 dB or sampling coupler O Spectrum Analyzer good to at least 1 GHz Alignment Preparation amp Precautions 50 0 dummy load and in line wattmeter must be connected to the antenna jack in all pro cedures that call for transmission except where specified otherwise Correct alignment is possible with an antenna Except where speci fied otherwise the transceiver should be tuned to 14 2000 MHz USB mode and these controls set as indicated PROC KEYER MONI OFF O MIC amp RF PWR fully CCW O ATT RF AMP AGC F NB OFF O AF as required O SQL fully CCW SHIFT 12 0 clock een Alignment O LOW CUT fully CCW O HIGH CUT RF GAIN fully CW The transceiver s Alignment Routine is re quired for some procedures If an Alignment Routine cannot be selected power may have to be switched off then back on to re enable menu selection To begin turn the transceiver off Press the UP DWN and FAST keys on the microphone to gether while turning the transceiver on again In the alignment procedure each alignment parameter is selected by rotating the SUB TUNE dial The alignment is performed by pressing the MCKIW key while injecting a signal of the re quired frequency and level Pressing
31. enu TX GAIN and select the USB mode Preset MIC control to the 1 position Tune the transceiver to 28 995 MHz and inject 1 kHz tone at 1 mV level to the MIC jack Key the transmitter and adjust the MEM VFO CH control for 50 W on the inline wattmeter If the 3 10 hexadecimal data on the transceiver s display is less than turn the con trol for just 8FH indication on the display O Tune the transceiver to 14 005 MHz and inject 1 mV at 1 kHz tone to the MIC jack Key the transmitter and adjust the MEM VFO CH con trol for 50 W on the inline wattmeter If the hexadecimal data on the transceiver s display is less than turn the CH con trol for just 8FH indication on the display O Tune the transceiver to 1 910 MHz for vers A H 1 850 MHz for vers or 1 840 MHz for vers and inject 1 mV at 1 kHz tone to the MIC jack Key the transmitter and adjust the MEM VFO CH control for 50 W on the inline wattmeter If the hexadecimal data on the transceiver s display is less than turn the MEM VFO CH control for just indication on the display SWR Meter Adjustment With the inline wattmeter and 50 Q dummy load connected to the HF antenna jack select the CW mode Tune the transceiver to 14 005 MHz Select alignment menu SWR 1 5 Key the transmitter and adjust the RF PWR control for
32. ified by the type of the majority of components installed on that side In most cases one side has only chip components and the other has either a mixture of both chip and lead components trimmers coils electrolytic capacitors packaged ICs etc or lead components only While we believe the technical information in this manual is correct Yaesu assumes no liabili ty for damage that may occur as a result of typo graphical or other errors that may be present Your cooperation in pointing out any inconsis tencies in the technical information would be appreciated Yaesu Musen reserves the right to make changes in this transceiver and the align ment procedures in the interest of technological improvement without notification of owners Specifications 2 ____ mmm General Frequency Range Emission Modes Synthesizer Steps Min Antenna Impedance Operating Temp Range Frequency Stability Power Requirements Current Consumption Case Size Weight Transmitter Power Output Modulation Types FM Maximum Deviation Spurious Radiation Carrier Suppression Opp Sideband Suppression 3rd Order IMD SSB Frequency Response Microphone Impedance Receiver Sensitivity Receive 100 kHz 30 MHz 36 MHz 76 MHz 108 MHz 174 MHz 420 MHz 512 MHz Transmit 160 6 Meters 2 Meters 70 Centimeters Amateur bands only 5 1675 MHz Alaska Emergency Cha
33. it Drive Section Idling Current Ammeter lead 1 540 15 15007 Pin 1 PA Unit Drive Section Idling Current Ammeter lead 1 540 15 05 Pin 1 CM Coupler Balance DC Voltmeter min tion Idling Current Ammeter lead 0 42 0 025 Ammeter lead 0 4240 025A nterconnection Diagram 51016 J1008 us J1015 noss STBY TUNER PACKET INT 5 0 9 na 5 43 SL E Di 2 0 2 91017 1006 J1007 240 EXT PTT EXT ret AF CNTL UNIT 79206718 59 OO av T 8 ao 0 J1018 oc 1025 GND 3 rak 6 2599983 11030 este O D i HS eee 1013 21005 21020 1027 41028 41010 41029 gt 8 88 84341411 6 7 5 69 63 Le 5 5 4 gt ono TR206705 8 PHONE 2 9 2 0 8 8 0 SE PA UNIT H H Z Q SOOT w wr ru PLL UNIT RE UNIT J3015 gt e SES a Joe 8 LU 990699 0 5 9 09 9 2 2 8 lt 5 3 5 b SHUTLE MAIN DIAL
34. k 3 9 Alignment connect the AF generator to the MIC jack pin 8 mic input pin 7 ground Tune the trans ceiver to 439 995 MHz and select the USB mode Preset the MIC control to the 1 0 clock position O Select alignment menu TX GAIN and inject a 1 kHz tone at 1 mV level to the MIC jack Key the transmitter and adjust the MEM VFO CH control for 25 W on the external wattmeter If the hexadecimal data on the transceivers dis play is less than turn the MEM VFO CH control for just 8FH indication on the display 50 MHz Band TX Adjustment O With the inline wattmeter and 50 dummy load connected to the 50MHz antenna jack connect the AF generator to the MIC jack pin 8 mic input pin 7 ground Tune the trans ceiver to 51 995 MHz for vers A C D H or 50 295 MHz for vers B E and select the USB mode Preset the MIC control to the 1 o clock position O Select alignment menu TX GAIN and inject a 1 kHz tone at 1 mV level to the MIC jack Key the transmitter and adjust the MEM VFO CH control for 50 W on the external wattmeter If the hexadecimal data on the transceiver s dis play is less than 8FH turn the MEM VFO CH control for just 8FH indication on the display Band TX Adjustment CT With the inline wattmeter and 50 dummy load connected to the HF antenna jack connect the AF generator to the MIC jack pin 8 mic input pin 7 ground Select alignment m
35. l at 129 995 MHz and tune the transceiver to 129 995 MHz Adjust T3007 T3011 T3015 and T3018 for minimum indica tion on the DC voltmeter 50 MHz RX IF Sensitivity Connect the signal generator to the 50MHz antenna jack and connect the DC voltmeter between TP1048 and chassis ground Tune the transceiver to 50 295 MHz and select the CW mode Preset the RF control fully clockwise and the SQL control fully counter clockwise 1 Inject a signal at 50 295 MHz so as to get de flection on the DC voltmeter and adjust T3019 T3021 T3025 and T3028 for minimum indica tion on the DC voltmeter 144 MHz TX Adjustment 1 With the inline wattmeter and 50 0 dummy load connected to the 144MHz antenna jack connect the AF generator to the MIC jack pin 8 mic input pin 7 ground Tune the transceiv er to 145 995 MHz and select the USB mode Inject a 1 kHz tone at mV level to the MIC jack Key the transmitter and adjust T1002 on the AF CNTL Unit and T3005 T3008 and T3010 on the RF Unit in succession several times for maximum indication on the inline wattmeter Select the FM mode Key the transmitter and adjust TC4002 for maximum indication on the inline wattmeter Connect the DC voltmeter between pin 3 of 4007 and chassis ground Key the transmit ter and adjust VR4004 for minimum indica tion on the DC voltmeter 847 Technical Supplement Alignment Select the FM mode Key the transmitter and adju
36. nnel USB LSB CW AM FM 1 9600 bps Packet F2 1200 bps Packet AFSK 0 1 Hz CW SSB 10 Hz AM FM 50 Q Unbalanced 10 to 50 C 14 F to 122 F Better than 2 ppm 0 C to 40 C SSB CW AM AFSK Better than 5 ppm 10 C to 50 C SSB CW AM AFSK Better than 1 kHz 5 ppm FM DC 13 8 10 Negative Ground Receive 1 5 Squelched 2 0 Max Audio Transmit 22 A 100 W RF output 260 W x 86 x 270 mm 10 24 x 3 39 x 10 63 Approximately 7 kg 14 4 Ibs 160 6 m 100 Watts 25 Watts AM carrier 2 70 cm 50 Watts 12 5 Watts AM carrier SSB Balanced Modulator FM Variable Reactance AM Early Stage Low Level 5 kHz 2 5 kHz on FM N Harmonics At least 40 dB down 1 8 29 7 MHz At least 60 dB down 50 144 430 MHz Non harmonic At least 50 dB down 1 8 29 7 MHz At least 60 dB down 50 144 430 MHz At least 40 dB At least 40 dB At least 31 dB down 14 MHz 100 W PEP output 400 Hz 2600 Hz 6 dB 200 2 10 kQ Supplied microphone 600 Q 55 AM N FM 500 kHz 1 8 MHz 20 pV 1 8 28 MHz 0 25 pV 2 28 30 MHz 0 25 pV 2 pV 0 5 pV 50 54 MHz 0 20 pV 1 0 25 pV 144 430 MHz 0 125 0 2 pV Above specifications are worst case SSB CW AM N figures are for 10 dB S N 12 dB SINAD FM Squelch Sensitivity Image Rejection IF Rejection Selectivity 6 604 Audio Output Audio output impedance
37. rent Ammeter lead 0 3 0 03 VR4002 VHF PA Idling Current Pin 3 144 MHz TX Adjust DC Voitmeter min Idling Current Ammeter lead 0 3 0 03 C4001 430 MHz TX Adjust dling Current Ammeter lead 0 3 0 03 TC4003 430 MHz TX Adjust just VR4001 UHF PA Idling Current just DC Voltmeter min eege 847 Technic PA Unit Alignment Points NI c5048 IMr 4 lt 203 ae 5002 5016 1 5027 5010 96 5009 15015 56 5509 Ges s023 csiss 8888 8 19 500 5059 cst3a L502 EA 29 Lon 25175 1 8 CEBI 34 65020 5008 5007 TC5001 Coupler Balance 45005 Pin 1 TP5001 Unit Final Section Idling Cur TP5002 PA Unit Final Section Idling Current Amme eg 847 Technical Supplement a a Align 8 8 2 4 110 x S IS VR5002 PA Unit Drive Section Idling Current J5006 Pin 1 PA Unit Pre Drive Section Idling Current Ammeter lead 0 25 0 025A 2 8 45006 2 PA Unit Pre Drive Section Idling Current Ammeter lead 0 25 0 025 1 500 5041 a g 88 VR5003 PA Unit Pre Drive Section Idling Current VR5003 PA Unit Final Section Idling Current 05095 115007 Pin 2 PA Un
38. st J1001 RX IF Sensitivity Signal Generator Noise Blanker Adjust Signal Generator m 71005 08 RX IF Sensitivity TC1001 Reference Output Adjust 41002 Reference Output Adjust RF millivoltmeter max T1002 Carrier Frequency Adjust 0 FM IF Adjust RF millivoltmeter max Freq Counter 45 580 MHz 100 Hz quency Adjust Freq Counter 45 580 MHz 100 Hz RF miilivoltmeter max AE CNTL Unit Alignment Points 4 908 1 comme 1008 ZN eg ih 255 i 2591 Ae 273 31020 VR1005 06 Carrier Level Adjust a 5 1002 Carrier Frequency Adjust 20 9 21022 A S VR1003 04 FM Deviation Adjust ES ES 5 OD 218 4 4 dek 050 5 3 Rossa 8 E p EES 298 room s 4 5 5 2 grees Trea 5 N Ao BS 8 5 dE A 11012 13 14 16 FM IF Adjust 1001 AFP Adjust Ae 347 Technical Supplement T1002 TP1050 FM IF Adjust 41003 Carrier Frequency Adjust d Alignment PLL Unit Alignment Points 985 2 PS 5 2 ffl Be 5 5 DT
39. st VR3003 for 50 W on the inline wattmeter 430 MHz TX Adjustment With the inline wattmeter and 50 0 dummy load connected to the 430MHz antenna jack connect the AF generator to the MIC jack pin 8 mic input pin 7 ground Tune the transceiv er to 439 995 MHz and select the USB mode Inject 1 kHz tone at 3 mV level to the MIC jack Key the transmitter and adjust TC3001 TC3003 and TC3004 in succession several times for max imum indication on the inline wattmeter Select the FM mode Key the transmitter and adjust TC4001 TC4003 and TC4005 in succes sion several times for maximum indication on the inline wattmeter Connect the DC voltmeter between pin 3 of J4007 and chassis ground Key the transmitter and adjust TC4004 for minimum indication on the DC voltmeter 1 Still in the FM mode key the transmitter and adjust VR3002 for 50 W on the inline wattmeter 50 MHz TX Adjustment O With the inline wattmeter and 50 dummy load connected to the 50MHz antenna jack connect the AF generator to the MIC jack Tune the transceiver to 50 295 MHz and select the USB mode Inject a signal from the AF generator at 1 kHz tone Key the transmitter adjust the audio lev el so as to produce power output that can be read on the external wattmeter and then ad just T3003 T3009 T3013 and T3016 in succes sion several times for maximum indication on the external wattmeter O Tune the transceiver to 50 295 M
40. the DC voltmeter O Remove the signal generator and replace the plug into J1001 Noise Blanker Adjustment O Remove the coaxial plug from J1001 and con nect the signal generator across the socket and connect the DC voltmeter to TP1049 Inject a signal at 45 705 MHz no modulation so as to get a reading on the DC voltmeter 1 Adjust T1004 and T1006 for minimum indica tion on the DC voltmeter Increase the signal generator level if necessary to maintain a use ful DC voltage indication O Remove the signal generator and replace the plug into J1001 TX and RX Adjustments VHF RX IF Sensitivity O Connect the signal generator to the 144MHz antenna jack and connect the SINAD meter and 4 Q dummy load to the EXT SPKR jack Tune the transceiver to 145 995 MHz and select the FM mode Preset the RF control fully clockwise and the SQL control fully counter clockwise Inject a signal from the signal generator at 145 995 MHz 3 5 kHz deviation of a 1 kHz tone adjust the level to get a moderate SINAD reading on the meter and adjust T3006 T3012 13014 T3017 T3027 T3029 and T3031 for op timum SINAD FT 847 Technical Supplement oe ETE 1 Connect the DC voltmeter to TP1048 and chas sis ground and select the CW mode 3 Inject a signal at 145 995 MHz so as to get a reading on the DC voltmeter and adjust T3006 T3012 T3014 T3017 and T3031 for minimum indication on the DC voltmeter 1 Now inject a signa
41. the RF PWR control for 20 W indication on the external wattme ter Then press the MCK W key 1 Select alignment menu PWR 10 Key the transmitter and adjust RF PWR control for 10 W indication on the external wattmeter Then press the MCK W key 1 9 MHz Band PO Meter Adjustment 1 Connect the 50 Q dummy load to the HF an tenna jack Tune the transceiver to 1 910 MHz for vers A H 1 850 MHz for vers B C D or 1 840 MHz for vers E and select the CW mode Select alignment menu PWR 100 Key the transmitter and adjust the RF PWR control for 100 W indication on the external wattme ter Then press the MCK W key Select alignment menu PWR 50 Key the transmitter and adjust the RF PWR control for 50 W indication on the external wattme ter Then press the MCK W key 1 Select alignment menu PWR 20 Key the transmitter and adjust the RF PWR control for 20 W indication on the external wattme ter Then press the key Select alignment menu PWR 10 Key the transmitter and adjust the RF PWR control 847 Technical Supplement for 10 W indication on the external wattme ter Then press the MCKIW key 50 MHz Band PO Meter Adjustment 1 Connect the 50 Q dummy load to the 50MHz antenna jack Tune the transceiver to 51 995 MHz for vers A C D H or 50 295 MHz for vers B E and select the CW mode 1 Select alignment menu PWR 100 Key the transmitter and adjust the RF PWR

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