Ericsson LBI-38848D User's Manual
Contents
1. 4 OPTION CABLE i em euo perde deemed mae ge tr Ee m 4 NOTICE NOISE SUPPRESSION KIT OPTION 4 POWER CABLE OPTION 3 3 esee ag ous Sheed PUT PRESE Des bu uu P EIe Bo 4 EXTERNAL SPEAKER OPTION mA Ae n E RUE RUE ue 4 This manual covers Ericsson and General Electric products manufactured and sold by Ericsson Inc M ME p cc B 5 SYSTEM DESCRIPTION 2 2 2 222 522 5 4 2 9 254424 Se e 4 EDACS S bat te Se rere edd MEE I SN M eS 4 CONVENTIONAE Ae B 4 GE MARG V 2 4d bd e us BOR ds ey 4 NOTICE Operational Modes V Redon Ipse eV S malesu Pond eie v Ber S EUR 4 Idle Mode 4 EAR A SuSE RR ERR Bede ea Sa EN 4 Repairs to this equipment should be made only by an authorized service technician or facility designated by the supplier Wait 4 Any repairs alterations or substitution of recommended parts made by the user to this equipment not approved by the Ready Mode 5 manufacturer could void the user s authority to operate the equipment in addition to the manufacturer s warranty GLOSSARY OF GE MARC V2. CONNECTOR O 14 ool o9 1 TQ3310 PC PROGRAMMING DISKETTE 6990 o OR TQ3370 PC PROGRAMMING EC M E gt o9 FLASH INTERFACE BOX e lt 9 O Q L_ __ J eol i O o a tA a K i3 L0 OPTION PD1A NOISE FILTER 19414853961 l PC PROGRAMMING SOR WARE pa Pl OPTION TQ3364 EDACS amp IGNITION SWITCH VOLTAGE 03346 GEMARC ONLY RED 29 GUAGE PC PROGRAMMER CABLE A5 SYSTEM OPTION TQ337219B801417P10 BOARD JIZ WIRE CONNECTION CHART Ce BATTERY i T ORANGE IB GUAGE DC REMOTE CONTROL 82 1 A N OPTION NO 1 1 BATTERY 194704686 7 join Pi 3 4 BLACK 16 GUAGE Pl 2 P2 2 ee ee ee E RET OE TV im 60 l 8 PTT FLASH_VPP 2 7 PTT l Pl 6 8 54 Ae e 1 P2 amp At i P2 10 AUDIO MUTE Pl 3 P 25 CTS EXTERNAL ALARM HORN CONNECT 30 AND A Pa Lt vOL SQ HI pi i4 P2 8 RELAY OPTION SUIC 194705499 1 1 TO OPTION CABLE HORN WIRES P2 8 CG DISABLE 11 P2 4 DISPLAT UZA NO CONNECTION L a Pl 32 2 5 KEYPAD 2 7 BATTERY 30 1 lt
3. 55 LBI 38848D Maintenance Manual DUAL FORMAT MDX 806 870 MHz MOBILE RADIO TABLE OF CONTENTS RF BOARD i 2 69 RR LBI 38849 SYSTEM BOARD LBI 38842 AUDIO LOGIC BOARD LBI 38843 AUDIO AMPLIFIER BOARD LBI 38844 FRONT CAP ASSEMBLY LBI 38850 LBI 38974 PA BOARD x a RUN LBI 38302 SERVICE SECTION LBI 38851 SYMBOL COMPONENTS ADDED DELETED OR CHANGED BY PRODUCTION CHANGES Ericsson Inc Private Radio Systems Mountain View Road Lynchburg Virginia 24502 1 800 528 7711 Outside USA 804 528 7711 PARTS LIST DUAL FORMAT MDX RADIO ASSEMBLY PART NUMBER 19D902123G22 19D901891G2 19D904025G2 19D903963G1 19C851822G1 344A4253G1 344A4255G7 19A705301P6 19B801467P1 19B801467P2 19B801454P36 19A705235P3 19B801454P38 19B801454P37 19B802397P1 19D904027P1 19C337683G2 19D904185G1 19D904186G1 19D904187G1 19B801358P18 19B235310P10 ISSUE 1 DESCRIPTION APPLICATION ASSEMBLY 19D904183 ASSEMBLIES RF BOARD SYSTEM BOARD AUDIO AMPLIFIER BOARD AUDIO LOGIC BOARD PA BOARD KITS Hardware Kit No 1 Hardware Kit No 2 CABLES Cable Antenna Cable J705 to J151 Cable J5 to J105 Cable RX to J104 Cable Ribbon J901 on Audio Amplifier to J902 on System Board Cable Antenna to J7 Cable TX to J101 Cable Handset MISCELLANEOUS Casting
4. 2 APPLY OVER TWO HOLES ON INSIDE OF CASTING P1001 PART OF REMOTE MOUNT WEATHERPROOF HOLES AROUND SCREWS USING RTV162 19 701648 2 PRE TIN AREA AROUND 0151 WHERE TRANSISTOR LEADS AND C152 C155 amp ARE TO BE SOLDERED SOLDER 0151 LEADS WITH A MINIMUM OF SOLDER TO BD BEFORE INSTALLING CAPACITORS SOLDER C152 C155 AGAINST BODY OF Q151 ON TOP OF TRANSISTOR LEADS AS SHOWN BEFORE INSTALLING AGAINST C155 AS SHOWN gt gt Bee Ab PART OF PA BD KIT 34444256612 N ROUTE THE TWO PA CABLES AS SHOWN J103 J153 CABLE THROUGH THE LARGE NOTCH NEAREST HEATSINK J102 J152 CABLE THROUGH SMALL NOTCH SECURE GASKET TO CASTING USING RTV3140 194803825P1 CLIP GND 6 PLACES THESE CLIPS DENOTED BY CROSS HATCH CLIPS CAN BE BROKEN TO MAKE HALF CLIPS AS NEEDED 190904183 Sh 1 Rev 17 7 LBI 38848D ASSEMBLY DIAGRAM Nera 19D904032P32 190904032 33 19D904032P31 PART 1 CONTINUED MDX DUAL MODE SIMPLEX 19D904032P34 KEYCAP PART 5 CONTINUED 19D904032P35 COMBINATION NAMEPLATE MDX CONVENTIONAL UHF amp VHF 19D904032P36 19B235310P 10 MDX CONVENTIONAL SIMPLEX MDX DUAL FORMAT TRUNKING MODE SIMPLEX SCREW QTY 4 Tice 19A702362P913 INSTALL LABEL ON MICROPHONE 190904032 32 A WASHER QTY 4 630608003 KEYCAP 19D904032P33 19D904
5. 1 1 amp P2 1 TX i 1 5 Pl 15 i 18 l C L EPET TO OPTION CABLE l 19 851585 2 P2 11 5 co lt f 87 cJ 19D904133 Sh 3 Rev 2 11
6. 18A701312P5 FLT WASH Pp P4 901025826 NOOPTIONINSTALLED Pe 91029330 NO OPTION INSTALLED J10 2 8 3 900 MHZ ONLY AUDIO AMPLIFIER BD JUMPER CHART JUMPER INSTALLATION NOTES 1482 12v SW PW CONTROLLED 13 182 MODE SELECT LOW J7 283 SWITCHED SPKR HI AUDIO MDX DUAL MODE SIMPLEX MDX 900 MHZ EDACS SIMPLEX NOTES AX PART OF MDX MDR MARRIAGE HARDWARE KIT 3444425361 PART OF RF BD HARDWARE 344A4255GB 00 2 PART OF RF BD HARDWARE 3444425568 800MHZ INSTALL BETWEEN PWB AND CASTING SOLDER TO PWB APPLY SILICONE GREASE 194701337P1 TO PA MOD Q101 AND U102 ON RF BD AND Q151 ON PA BD ALSO 801 AND U727 ON AUDIO AMPLIFIER BD 5 ENDS OF SCREWS THAT GO INTO CASTING IN GREASE 19A115204P1 BEFORE INSTALLING INTO CASTING TORQUE TO 15 INCH POUNDS LUBRICATE 2903 PINS WITH GREASE 19 704532 1 INSTALL U101 FLUSH TO PWB AND FASTEN WITH SUPPORT TO CASTING BEFORE SOLDERING LEADS TO PWB TOP OF U101 SHALL NOT EXTEND MORE THAN 0 25 ABOVE ADJACENT CASTING PRE TIN AREA AROUND Q151 WHERE TRANSISTOR LEADS AND C152 C155 C161 AND C162 ARE TO BE SOLDERED SOLDER 0151 LEADS WITH A MINIMUM OF SOLDER TO BD BEFORE INSTALLING CAPACITORS SOLDER C152 C155 AGAINST BODY OF Q151 ON TOP OF TRANSISTOR LEADS AS SHOWN BEFORE INSTALLING C161 AND C162 AGAINST C152 AND C155 AS SHOWN PART OF BD 34444256610 800 2 PART OF PA BD KIT 34444256612 900
7. If the Call Retry option has been enabled through programming the radio retries at 5 second intervals up to 15 times unless END is pressed a channel is acquired or an out of range condition occurs If NO SVC is displayed and five beeps are sounded after attempting to place a trunked call the radio is out of range of the GE MARC system If the beeps sound when the radio is within known range of the system the radio may need servicing If the Call Retry is active the radio tries the channel at twenty second intervals for five minutes CARRIER CONTROL TIMER SYSTEM TONES GE MARC and Conventional operation A pulsed tone signal is sounded for a pre programmed time after PTT is pressed Af ter nine seconds of pulsing the alert tone the radio unkeys the transmitter and com munications are interrupted While the tone is pulsing the user can release and press PTT again to reset the timer and resume the conversation In the conventional mode the radio unkeys and beeps until PTT is released The GE MARC radio may generate other system tones to alert the user of custom programmed events Contact the GE MARC system operator for details about these alert tones ASSEMBLY DIAGRAM LBI 38848D 19A143904P3 0101 19 143904 2 U101 PA MOD AAA 19A705301P6 CONNECTOR A 19 85166961 SUPPORT 18A704884P12 18A704884P10 AA SEE DETAIL B CABLE A AN 194702381 P508 194702
8. SYSTEM TERMS 5 RADIO OPERATION en Gehe eus he um E uM depu tet be abu e ges 6 USERJINTEREACKE 3 sem 6 ALERT TONES 25 zb Eee SEL eed seem s ge edm 6 EDACS APPEICATIONS 2 Sl E 2 4 eg 2 6 NOTICE GE MARC APPLICATIONS 2o eum Ade Rede re 6 ASSEMBLY DIAGRAMS i e RE RURAL RUE TU up E RUE E 7 The software contained in this device is copyrighted by the Ericsson Inc Unpublished rights are reserved under the 2 S 5 copyright laws of the United States INTERCONNECT DIAGRAMS 2240 40 27 XT 9 PARTS EIST e Re Rees Ao wv Rel dee ee Rm y eer Rp Back This manual is published by Ericsson Inc without any warranty Improvements and changes to this manual necessitated by typographical errors inaccuracies of current information or improvements to programs and or equipment may be made by Ericsson Inc at any time and without notice Such changes will be incorporated into new editions of this manual No part of this manual may be reproduced or transmitted in any form or by any means electronic or mechanical including photocopying and recording for any purpose without the express written permission of Ericsson Inc Copyright December 1992 Ericsson GE Mobile Communications Inc LBI 38848D GENER
9. terminates the call Operational Modes The radio will always be in one of three operational modes Idle Wait or Ready The three operational modes and the conditions that cause the radio to switch from one mode to another are shown in Figure 2 The radio enters the Idle mode when power is turned on and begins scanning channels for incoming calls The Wait mode is entered when the user places a call The radio remains in the Wait mode until a channel is acquired or if no channel is available The Ready or Conversation mode is indicated by an alert tone and the mode indicator on the control panel A signal timing diagram is shown in Figure 3 Idle Mode When the radio is in the Idle mode the audio is muted and all channels programmed for call decode are sequentially scanned for an incoming call An incoming call is identified by detecting one of the collect tones programmed in the area Upon receipt of a collect tone the mobile looks for a short interval for the group or individual tones providing that their collect tones are the same When no valid tone is found the mobile will resume scanning the channels for an incoming call If a group or individual decode tone is detected the mobile then looks for busy tone for a 90 millisecond period If four tones are properly decoded the mobile will then look for busy tone for 270 milliseconds When no valid tones are found the mobile will resume scanning for a call with the next
10. using Channel Guard repeaters or receiver voting choose the highest usable Channel Guard tone frequency Do not use tones below 100 Hz when it is necessary to meet the receiver response time requirements of EIA Standard RS 220 Table 2 Digital Channel Guard Codes PRIMARY EQUIVALENT PRIMARY EQUIVALENT PRIMARY EQUIVALENT CODE CODE CODE CODE CODE CODE 023 340 766 251 236 704 742 632 123 657 025 261 227 567 565 307 362 026 566 263 213 736 654 163 460 6007 031 374 643 265 171 426 662 363 436 443 444 032 271 427 510 762 664 344 471 715 043 355 306 147 303 761 703 150 256 047 375 707 311 330 456 561 712 136 502 051 520 771 315 321 673 723 235 611 671 054 405 675 331 372 507 731 447 413 474 744 065 301 343 324 570 732 164 207 071 603 717 746 346 616 635 724 734 066 072 470 701 351 353 435 743 312 515 663 073 640 364 130 641 754 076 203 074 360 721 365 107 036 137 114 327 615 371 217 453 530 053 115 534 674 41 117 756 122 535 116 060 737 412 127 441 711 145 525 125 173 413 133 620 20 253 131 572 702 423 234 563 621 713 225 536 132 605 634 714 431 262 316 730 246 542 653 134 273 432 276 326 252 661 143 333 445 222 457 575 255 425 152 366 415 464 237 642 772 266 655 155 233 660 465 056 656 274 652 156 517 741 466 144 666 325 550 626 162 416 553 503 157 322 332 433 552 165 354 506 224 313 574 356 521 172 057 516 067 720 446 467 511 672 174 142 270 532 161 345 452 524 765 205 135 610 546 317
11. 010 EXTERNAL SPEAKER CHALE 16 FEET REQUIRES 49590210 ZHIK SPEAKER KIT LSIF CUIM 255 P2 i ers L 072 CABLE LACES 58514 Pi ho XB cO Beane seas eae PIIA NOISE SUPPRESSION KIT 14814851961 surt HORN ALARN RELAY KIT 194705499 1 l 03372 PC PROGRAMMER CABLE 19B801417P9 ls OBTION CALLE CDT PUBLIC ADDRESS RELAY 03319 PC PROGRAMMING INTERFACE BOX 19043836761 OPTION SUSA 19 851585 17 101354 PC PROGRAMMING SOFTWARE EDACS amp GEMARC I9CBSISESPIS 103346 PC PROGRAMMING SOFTWARE GEMARC ONLY HOUMTING BRACKET KIT 19812804161 Pl CONNECTS 5 25S 18 FEET REHOTE MOUNT KIT MAJK COSC MAAN SYSTEM BOARD J905 SUSA PUBLIC ADDRESS RELAY EXT SPEAKER RELAY KIT 18 85 1585 17 l DC REMOTE CONTROL 387 04686P7 703370 PC PROCRAMMING FLASH INTERFACE BOX 18043836202 WIRECONNECTION CHART FROM COLOR l OPTIONS ARE STANDARD A NOTE P2 2 WHEN ORDERING PLEASE REMEMBER THAT ALL OPTION CODES FOR THIS aL ond PRODUCT ARE PRECEDED BY THE PRODUCT CODE PM EG PMANIL P2 1 gro RX AUDIO FOR COMPLETE LISTING OF OPTIONS SEE YOUR AUTHORIZED EGE DEALER OFF ORG HHITE el GREEN VIOLET ORANGE TAN SPARE j ANTENNA E OPTION
12. 032P 44 E i NOTES N PART OF HDW 3444425361 TOP COVER BOTTOM COVER Pt 1989041866 _ 1909041856 19A705421P6 INSERTED IN HOLE SYSTEMS BD MICROPHONE 198801398P SR NUR TM 194702362306 344A452BP_ 344A3826P_ 190904032 37 344MGTIP 344MT55P KEYCAP i 19D904032P35 KEYCAP 1 zu Se 5 ouem MDX GE MARC LABEL 198802420P TOP VIEW CET BOTTOM VIEW DUST PAD NOTES LL AN 19D904037P2 TO SYSTEMS BD J904 19A705421P1 A 19a702362P306 A PART OF KEYCAP KIT 3444425461 190904032 32 19D904032P31 19D904032P33 VIEW AT A CONTROL PANEL T 1909041516 FRONT m N pw a 9 Gm p KEYCAI 19D904032P34 KEYCAP 19D904032P49 KEYCAP 19D904032P36 MDX SYSTEM CONTROL UNIT 19D904183 Sh 2 Rev 17 19D904183 Sh 5 Rev 17 8 4 OPTION PD1A NOISE FILTER 19A148539G1 IGNITION SWTTCH VOLTAGE lt Q RED 29 GUAGE BATTERY ORANGE 18 GUAGE 4 3 BATTERY BLACK 18 GUAGE 1 WEATHERPROOF IE c H 4 p EXTERNAL i T SPEAKER miam Eat rs 494149590P1 EXTERNAL EXTERNAL SPEAKER SPEAKER 5
13. 3 3 5 s sicizlalalaialalala 5 z WH 1253 5 mu 5 Ra ORANGE iB GUAGE Ae enna zu m 1 NEN P3M4 sri 43 a Aww eje Ac I mack 16 GUAGE m ERED 2322 824458 z 5 35 2 2 1 AUUDO lt lt gt lt 707 2 AUDIO MUTE DISPLAY 2 nzn HS23SP3 9 X52 5151 505858 f SA RS lt lt gt lt SERIAL ROST BOARD Mrz qeu n 1 33248P11 a ga xg as 286 9707 3 owl A i eB Bux MODE SELECT 190903157 Cra n S 3 ae 200 23 SPKR HI gt 3301 1 SPKR HI ETE E i OD OPTION ac DUTY ac tok 2 a lt 5 190 2 a ze cc DISHO SHAHS RX AUDIO c Dake CG DIS HO0K SK HS AUDIO ui QU as z SPENNER LO gt om SPKR LO ag DISPLAY SERIAL lt 2 9 08 SERIAL 1304 3 z E 1921 1 KEYPAD SERIAL Cus TH SYSTEM BOARD SERIAL lt d aun SERIAL AUDIO FEES Y 4 2702 8 au lt lt 190901891 He es Spe ie a AMPLIFIER meal te 199 35 EM sy ax 2392 8 I 2801 SK BOARD PIT FLaSH VPP c PTT FLASH VPP 1905 6 ROGT 1302 7 1301 7 PA 0 SOMER cH 22 92 1 STAR SEREAL ROST MIC HI lt i gt MIC_HI TX_AUDEO 190904025 POWER SH lt i a 195 7 gm 1202 8
14. 381 P508 SCR 8 PLACES A SCR 4 PLACES 194705417 P1 49A702364P208 SCR 2 PLACES GND CONTACT 19A700033P3 199018910 ZX 18A703425P4 L W 2 PLACES PG CLIP SPG CLI A SEE DETAIL 19 705220 1 m S SEE DETAIL D CLIP PLACES 1902 19D902944G 19 8518220_ ae SEE JUMPER CHART PWR AMPL L dad SEE DETAIL A AS AO 18A705126P1 CER CAP p A 194702381 P508 19D904027P CASTING SCR 2 PLACES TOP VIEW P10 J10 ON G2 BD NOTE GROUNDING CHE SEE JUMPER CHART P801 FROM SPEAKER LSI ON FRONT CAP ASM THIS LOCATION ONLY 19B801253P5 AUDIO AMPLIFIER PWB CABLE 19D904025G BETWEEN J707 ON AUDIO AMPLIFIER PWB AND P707 ON DISPLAY PWB p 19A705235P3 za CABLE BETWEEN J901 ON AUDIO AMPLIFIER PWB AND J902 ON SYSTEM PWB A 19A702381P508 SCR 4 PLACES p SEE JUMPER CHART Pi P3 3 FRONT VIEW OF AUDIO AMPLIFIER PWB 344A3235P1 CLIP 7903 DETAIL C162 NOTCHED TERMINAL NOTCHED TERMINAL DETAIL C DETAIL D DETAIL B MDX DUAL MODE SIMPLEX MDX 900 MHZ EDACS SIMPLEX SYSTEMS BD _ A 194702381 P508 SCR PLACES SEE VIEW A AA 344 3324 1 GND CLIP PART OF SYSTEMS BD 19C851585P2 PLUG A 19C851442P3 3 PLACES 19D902132G_ 19D902123G_ RF 344A4449P1 FOAM BUTTON AS AN P702 19B801369P5 CONNECTOR 19D903963G _ AUDIO LOGIC BD BOTTOM VIEW 18A702381P520 SCR 194700033P6 LOK WASH
15. 52 7 1 CABLE i CABLE 16 FEET 48 INCH 1 OPTION CD1W 19 149509 8 Ly 19A149590P10 INTERCONNECTION DIAGRAM STANDARD POWER CABLE 9 FEET OPTION CD7W 19B801358P18 4 t OPTION CABLE RED 20 GUAGE ORANGE 15 GUAGE BLACK 16 GUAGE WHEN ORDERING PLEASE REMEMBER THAT ALL OPTION CODES FOR THIS PRODUCT ARE PRECEDED BY THE PRODUCT CODE PM EG PMAN1L LBI 38848D OPTION CD7Z 19 851585 14 ALL EXTERNAL OPTIONS allt wile fee a a a u 1248 11 9959 184580 CX 16 1 a amp amp 2 anm 2 cms ER epa a ga 0 Dea Sii e 12190 3 E t Sw EXT MIC HL 8 BISPLAY SERIAL Dumas STANDARD tt eet oia OPTION 1 8 12 8 Masi ee RETE SERI 138801398614 C CE STAR SERIAL ROST 298 4 te fi 12 7 4 ET Ext PTT Pit p J1001 7 MIL SPEC MIC 71 8 J2 8 1305 8 LI I1001 8 OPTION MC3R Fea UTI CG DISABLE CG DIS HO0K 5H las 19 01444 5 1 Sats E a Ce SH spur HI DISABLE 11 10 12 10 395 16 i SWITCH OPEN WHILE ord EET SEL AUDIO MUTE HICHOLOER 0 HOOK 5 4 44 C VOL SQ Hi n ja 2 21905121 Lo USED IN DTMF 1 13 12 13 4 21305 13 MIC ONLY wL Y OPTI
16. 614 751 454 513 545 564 223 350 475 750 606 153 630 455 533 551 226 104 557 612 254 314 706 462 472 623 725 243 267 342 624 075 501 523 647 726 244 176 417 627 037 560 526 562 645 245 370 554 631 231 504 636 745 NOTE Primary codes in bold are unique Ericsson codes AUDIO LOGIC BOARD The Audio Logic Board provides all audio and digital processing of the receive and transmit audio for digital processing by the Logic Board The board also contains audio filtering conventional analog tone processing and the receiver squelch The Audio Logic Board controls the opera tion of the radio and digitally processes the receive and transmit audio The board contains a microprocessor and associated memory circuits including an EPROM for con trolling the processor and a programmable personality memory an Electrically Erasable PROM EEPROM to store customer frequencies tones and options The micro processor provides control data to the Audio Signal Proces sor ASP conventional tone generation and detection frequency data for the synthesizer and sends and receives data to another microprocessor on the Display Board for the LCD SYSTEM BOARD The system board controls the main input power to the radio IGNITION SENSE input lead provides the necessary signals to the MOSFET switching circuit The board also interfaces all option connections from the internal boards in the radio with the optional items outside of th
17. AL Regulatory Approval FCC United States DOC Canada Operating Voltage Battery Drain Receiver 13 8 Vdc Off Squelched Unsquelched Transmitter 13 8 Vdc Channel Spacing Frequency Stability Temperature Range Dimensions H x W x D Less Accessories Height Width Depth Weight Antenna Impedance TRANSMITTER Frequency Range Output Power Audio Sensitivity Spurious and Harmonics Audio Distortion Modulation Limiting FM Hum and Noise Audio Frequency Response Per EIA Standards RECEIVER Frequency Range Acceptable Frequency Displacement Sensitivity 12 dB SINAD Spurious Response Adjacent Channel Selectivity Intermodulation Distortion Audio Frequency Response Audio Output Audio Distortion These specifications are intended primarily for use by service personnel Refer to the appropriate Specification Sheet for complete specifications SPECIFICATIONS AXATR 311 A2 TR 311 13 8 Volts 20 0 01 Amperes maximum 0 75 Amperes maximum 2 0 Amperes maximum at 10 Watts audio External Speaker 11 Amperes maximum at 25 Watts RF 25 kHz 12 5 kHz NPSPAC 1 5 PPM 0 00015 30C to 60C 22F to 140F 5 3 cm 2 1 inches 18 2 cm 7 2 inches 24 0 cm 9 5 inches 3 0 kg 6 6 pounds 50 Ohms 806 0125 824 9875 MHz 25 Watts Intermittent duty cycle EIA 20 125 mVrms typical lt 16 dBm 5 maximum 5 kHz maximum 4 kHz max 821 000 824 9875 and 866 000 869 9875 MH
18. Bracket Cover Bottom Cover Top Panel Front Cable 9 Foot Power Nameplate Combination Printed in U S A LBI 38848D TABLE OF CONTENTS Page SPECIFICATIONS Ge ao dey ath ee aa aps ivre eL de xg 2 GENERAL DESCRIPTION 5524 en xao we eae B 2 RE BOARD a OR Ra eV PME NES 2 SynthesizerCireult co yk kc EAE A RAS Ro Xam x 2 TransmutCireult 4012 we 2 Receiver Circult 52 2 US Pure mes cobi e IIR Robe Ren 2 POWER AMPLIFIER BOARD 2 AUDIO LOGIC BOARD 4 azra UE Eee me eins 3 SYSTEM BOARD acia pais her tue oes eR RR we Peeled mu 3 FERONT CAP ASSEMBLY ub deco Fee M qu Lu ae bee hee 3 ACCESSORIES AND OPTIONS 25252250605 UPS RUE eg EE 3 PCPROGRAMMER OPTIONS oi Gas oW Re DER RUP Y SY E 3 PC PROGRAMMED OPTIONS acd iE e hk SIN ane ee Rates RU ee Hos 3 Carrier Control Timer CCT sima PES NUR B ST Pues 3 Channel EE RAD ea eU wee presb uu Wd A 3 Squelch Tad Elimination STE 2 05 26 E e Tue aes a EUN GS 3 Retry Option o eet RR RUN 3 HARDWARE AND HARDWARE OPTIONS
19. LAY 1998 01253 5 AAA eine 190904151 i i FHR INTERCOMMECT 19880146701 A nix IFRONT CAP ASSEMBLY E m RF COAX 1887 04884 4 RF COAX 1382048 4 11 cu m en a EXT KIC HI TO MIC SH At js Mac fe a ipid OPTION CONNECTOR PART OF prog 5245 dish tg 8m REMOTE MOUNT OPTION ZM55 4 T AL 3 3 Er pa died i i Vy PECE A Bref 95x DIS HOQK SH RF IUD pi fi31 2 1204 2 re paak 8 SH SPKR g m lt us RUN i l R 3 RELAY gt AUDIO RUTE lt lt gt SW At x m g SH AZ y 3 BUF VOL SQ HL 1150 4 50 HI V MIC LO GND l SH At lt gt SH At BAND SHETCH BARI SH ER i paraa EITE RELAT H PETI e DISPLAY SERIAL 50 HI S HI DPTT KEYPAD SER AL RF OUTPUT pa EY A TX HOD TX Hon l amp AN 792 3 Ad aS perio SEE AUBIO LOGIC BOARD BORRD S MUTE Ben egi 5 DATA 30903363 19C851822 BOO MHZ S CLK MIC MUTE lt l 190902944 900 MHZ Te 702 1 LACK ET a2 A d 5y EE 1142 IN RF BOARD 3 2 190902123 800 MHZ sskiegjsacsugxaaa5siaag9ev9 2sgsumausoru 2 11 81902132 300 MHZ 330121 szsss
20. ON 2309 15 SERIAL MDX CONNECTOR SIMPLEX MOBILE TO RF BOARD THRU BULKHEAD MOUNTED TNC CONNECTOR P2 ANTENNA RF CONNECTOR CABLE i 1367 0530 1PE l P Wr E been EA EXTERNAL ALARM HORN CONECT 30 AND IN PARALL REPAY SUM EXISTING HORN WIRES 19 705499 1 87 NO CONNECTION A i HATTER i in 3 TO OPTION CABLE i aim ox di 19D904133 Sh 1 Rev 3 9 M ALS LLLA e A aa a A f Desc siue Lr a eere ey gae ee pare ir tia ane Ca a Se a ae aa oe o 1 REMOTE MOUNT Ead x E Ya m ZY OH 3 WATT 1585 1 SPS Sy E lc a 25 2 2 5 e 3 2i ja al RED 20 GUAGE 2E 3 z
21. channel When a busy tone is found the mobile will enter the Ready mode If busy tone is not detected the mobile remains in the Idle mode and continues scanning channels looking for an incoming call Removing the handset from the hanger pressing the PTT switch or pressing the SEND key on the handset will cause the radio to enter the Wait mode Wait Mode When the user enters the Wait mode the display group is checked to make sure it is a valid call originate group If it is not valid a low frequency tone is heard for one second If valid the radio will scan the call originate frequencies for brief intervals until it finds one with no busy tone on it If no channel is free the radio if programmed for this option will activate the Call Retry state and display RETRYING in the display Retrying will cause the radio to revert to the Idle mode and scan for an incoming call while trying to acquire a free repeater approximately every 5 seconds for a 2 minute period If the Retry option is not enabled the mobile will sound the low fre quency tone and then return to the Idle mode and display BUSY If a channel with no busy tone is found the mobile trans mits a burst of busy tone to acquire the repeater The repeater then responds with a burst of acquisition tone Upon receipt of the acquisition tone the mobile proceeds to transmit the group tones either two or four tones If a four tone sequence is sent the mobile must detect all fo
22. e during radio initialization using the PC pro grammer The Dual Format MDX Mobile Radio assembly con tains the following circuit boards and assemblies 9 Power Amplifier Board 19C851822G1 9 RF Board 19D902123G22 System Board 19D901891G2 Audio Logic Board 19D903963G1 9 Audio Amplifier Board 19D904025G2 Front Cap Assembly 19D904151G1 The circuit boards are all mounted on a main casting to provide easy access for servicing Interconnect plugs are used to connect the boards to eliminate pinched wires and other wiring problems RF BOARD The RF Board includes the programmable frequency syn thesizer transmitter exciter receiver front end and IF circuitry Synthesizer The synthesizer circuit generates all transmit and receive RF frequencies The synthesizer frequency is controlled by the microprocessor located on the Audio Logic Board Frequency stability is maintained by a temperature compensated reference oscillator module Transmit audio is processed on the Audio Logic Board and applied to the synthesizer to modulate the VCO and TCXO The buffered VCO output drives both the transmitter exciter and the receiver mixer Transmitter The transmitter consists of a fixed tuned exciter module a PA module and a power control circuit The PA module provides RF output to drive the antenna The power control circuit controls the PA module to maintain a constant output power across the band The RF output level is internall
23. e mobile into a queue transmits a queue message back to the mobile and will give a channel assign ment to the requesting mobile as soon as a voice channel is free If the system is busy and the station queue is filled to capacity a system busy message is returned to the requesting mobile and an alert signal is given to the user After the initiating mobile receives a channel assignment from the control station it immediately switches frequency over to the assigned voice channel and sends a burst of 9600 baud dotting The microphone voice paths are then unmuted and the transmission begins The transmitting mobile also continuously sends out a subaudible tone along with voice for system reliability If the station loses this signalling the voice channel is muted and all receiving mobiles are sent back to the control channel In normal operation the transmitting mobile sends a high speed data burst to indicate that the user has unkeyed causing all listening mobiles to switch back to the control channel CONVENTIONAL MODE In conventional mode not trunked the radio can operate either with tone Channel Guard digital Channel Guard or carrier squelch depending on personality programming Tone Channel Guard range is 67 0 to 210 7 Hz Squelch Tail Elimi nation STE is used with Channel Guard to eliminate squelch tails at the receiving radio by phase shifting the transmitted Channel Guard tone when the PTT is released Direct mode wor
24. e radio All external options for the radio interconnect to the System Board through the back of the radio using an optional cable FRONT CAP ASSEMBLY The Front Cap Assembly contains the Audio Amplifier Board The Audio Amplifier Board provides compression of the microphone audio It also provides audio compression for the received audio in the discriminator and internal ex ternal speaker audio paths A 10 watt power amplifier is provided on the board to drive a 4 ohm internal external speaker ACCESSORIES AND OPTIONS PC PROGRAMMER OPTIONS The radio is programmed using an IBM compatible personal computer equipped with a RS 232 port Option TQ3370 provides the RS 232 serial interface unit and the cable between the PC and the unit An auxiliary power supply for the unit is also included but is not needed to program the radio Option TQ3372 provides the radio programming cable between the PC interface unit and the radio microphone jack MDX PC programming software Option TQ3346 GE MARC only or TQ3373 EDACS is provided in both 3 5 and 5 25 inch diskettes LBI 38848D PC PROGRAMMED OPTIONS Carrier Control Timer CCT The Carrier Control Timer turns off the transmitter after the microphone push to talk PTT switch has been keyed for a pre programmed time period A pulsing alert tone warns the operator to unkey and then rekey the PTT to continue the transmission The timer can be programmed using the PC programmer An
25. e unit is requesting an unavailable service A single low pitched tone sounds immedi ately after the PTT key is pressed indicat ing the radio is out of range of the repeater The radio tries to place the call for a short period 3 seconds after the initial attempt The radio generates a second low pitched tone when it gives up trying to place the call These tones are also heard if the sys tem is off the air or the radio needs servic ing even when the radio is within calling range of the repeater GE MARC APPLICATIONS CALL RECEIVED ALERT CALL ORIGINATE ALERT INVALID CALL ORIGINATE ALERT SYSTEM TONES OUT OF RANGE ALERT If programmed a single alert tone sounds when a group call is received and a two tone alert one high followed by one low tone sounds for an individual call WAIT momentarily displays when a call is being placed Then a three tone alert is sounded to indicate the call origination is complete This indicates a channel was ac quired and is ready for normal conversa tion A low frequency tone is sounded for one second immediately after pressing PTT and the display does not show WAIT This in dicates a call was attempted within a group that is not enabled for call originate or an invalid dispatch overdial call was at tempted A low frequency tone is sounded for one second after attempting to place a trunked call and BUSY is displayed This indicates that the GE MARC system is busy
26. een detected or an idle chan nel has been acquired the mobile enters the Ready mode In this mode the audio and push to talk circuits are enabled the speaker is unmuted and the operator is alerted by an alert tone The radio can then be used in the conventional push to talk manner with the radio remaining on the channel until the operator hangs up or the repeater drops the busy tone causing the unit to revert to Idle mode NOTE Ifa call 15 initiated and a sequence of five beeps is sounded the user cannot access the radio system because the mobile is out of receive range or is inoperative Any subsequent call will be ignored for 20 seconds POWER ON CHANNEL ACQUIRED IDLE MODE UNIT IS SCANNING CHANNELS FOR CALLS WAIT MODE UNIT ACQUIRES A CHANNEL AND TRANSMITS SIGNALLING TONES READY MODE UNIT IS LOCKED ON A CHANNEL ALLOWING COMMUNICATION Figure 2 GE MARC Operational Modes Figure 3 Signal Timing GLOSSARY OF GE MARC TERMS Idle Mode In the standby condition the mobile is inactive but prepared to call or be called The trunked radios are IDLE until they are turned off Wait Mode In the attempting origination condition the Wait mode is entered from Idle mode only as the user presses the PTT switch on the microphone or comes off hook If successful the unit becomes READY Otherwise the unit is IDLE or IDLE WAIT after all channels are tried Ready Mode In the op
27. erating condition Ready is entered from Idle mode via Wait mode when calling or directly from Idle when called Ready mode ends the radio reverts to Idle when the user disconnects or with the loss of received Busy Tone from the repeater This normally occurs when the repeater shuts down after communication is completed Busy Tone Voice plus tone of 3051 9 Hz is the standard busy tone The 2918 Hz is the alternate busy tone The busy tone modulates mobile and repeater transmitters at a low level of kHz deviation continuously This tone is filtered out of the received audio and is used to hold the communication chan nel active It also excludes other mobiles from using the channel when a call is active Acquisition Tone A 1962 9 Hz tone sent at full deviation for 50 millisec onds from the repeater is used as acknowledgment from the repeater that a busy tone was sent and signals the mobile that signalling tones can now be sent Collect Tone A tone chosen from 34 standardized frequencies rang ing from 508 6 Hz to 2792 4 Hz is used as the first tone in the group tone sequence The collect tone is used to gather all mobiles with the same collect tone for decoding a call The duration of the tone varies as a function of the number of channels which are programmed into the mobile and or repeater LBI 38848D In a two tone call the mobile sends the collected tone for a programmable duration In the four tone call t
28. he mo bile always sends a 90 millisecond collect tone which the repeater regenerates and sends for the correct duration Group Individual Tones Group Individual Tones chosen from the 34 standard frequencies follow the collect tone In a two tone call the second tone is sent for 450 milliseconds In a four tone call the second third and fourth tones are sent for 90 millisec onds from the mobile and 180 milliseconds from the re peater RADIO OPERATION A complete set of operating instructions for the Dual Format MDX are provided in LBI 38846 and are provided with each radio This radio is flexible in operation and can be used in any of three operating modes Conventional radio system En hanced Digital Access Communications EDACS system or GE MARC tone controlled system Either of the latter two systems provide trunked channel selection for increased channel utilization In an EDACS trunked environment the user selects a communications system and group In this mode audio channel selection is transparent to the user and is controlled via digital communication with the system controller This mode incorporates advanced programmable features and fast access to communication channels In GE MARC trunked environment the user selects a communications area and group In this mode audio channel selection is also transparent to the user and is controlled via tone signalling In Conventional mode the user selects a channe
29. ks identically to conventional mode ex cept that the transmit frequency band is changed to 851 to 870 to permit direct mobile to mobile communications GE MARC The GE MARC trunked mobile radio system consists of a repeater for each channel and the users mobile radio units The system uses tone signalling with each mobile being as signed two and or four tone group tone sequences Groups of mobiles are assigned the same tones so that any unit can talk to all other units in the same group A block diagram of the GE MARC is shown in Figure 1 When originating a call the mobile identifies an idle repeater channel and interrogates it with a single burst of busy tone the repeater keys its transmitter and sends a burst of acquisition tone back to the mobile unit When the interrogating mobile detects the acquisition tone it then trans mits its collect and group tones which the repeater regenerates for all idle mobile units in the system The idle mobiles which continually scan all channels will stop on the active channel if any of the programmed collect tones are detected and wait for group tone s If the correct tone sequence is detected the mobiles will alert the operator of an incoming call and open their audio circuits If the correct sequence is not detected the idle mobiles will resume scanning the channels Once the mobile is locked on a channel it will remain there until the repeater times out or the operator
30. l and communicates on that channel In this mode a system refers to a set of channels and a channel is a transmit receive radio frequency pair The exact operation of any radio depends upon the operating mode the programming of the radio and the par ticular radio system Most features described in these oper ating instructions can be enabled or disabled through programming Both of these important factors must be con sidered when addressing the following instructions USER INTERFACE Operating controls are located on the radio front panel and microphone The front panel LCD provides radio status and commu nication control information to the operator The keypad is used for manual number entry for individual calls access to a telephone interconnect system and activation of various EDACS GE MARC and conventional features Turning The Radio ON OFF The radio is turned ON OFF by pressing the PWR button in the upper left corner of the front panel A self diagnostic test is performed when the radio is first turned on if enabled through programming To turn the radio OFF press the PWR button again ALERT TONES The Dual Format MDX radio generates a set of unique alert tones to indicate operating status The following section identifies and describes the alert tones used in the Dual Format MDX radio for Conventional GE MARC and EDACS applications EDACS APPLICATIONS CALL ORIGINATE ALERT If programmed a short to
31. lt lt 1901 8 SH SPKR HI SPARE F lt S lt T sr SPARE 39 8 poner oy 282 19 2 5 s TOt POHER SM SPARE lt lt gt lt meal PE 2 5 SPKR HI 202 14 7 1901 09 OPTION B z 24 P lt lt STE 12V SH 905 101 c 1902 15 1901 11 x 4 SW At i C1 0 MUTE REELE DISPLAY SERIAL SH_At S ms 1901 12 AUDIO PPO ASL Mre uf7TX AUDIO lt gt auro 7 5 AUDIO MUTE amp HI TX AUDIO lt gt 194 12 134 1 1 E 18 LO NUDTO GNO 1644 atc Lo x MIC LO 4 MIC LO RUDIO GNU 3 g a aa 5 CHEM mint a oaae 12292 18 g lt yE cc ars Hook ag 8 S a lt 2 ea EE x2 3383 137 SERLAL amp pes S A 2797 18 7305 16 mle 24 7 901 18 lt g 3 Ea a lt gt KEYPAD SERIAL GE STARCSER AL ROST lt tJ gt 2338 4 oie SEE RSS o 5v 6242 2226 Cee in CABLES ef l EZ E i a SPI DESCRIPTION GE NUMBER uw isssssssss x 6 amp ANTENNA 13670530186 S 2 2 6 2903 SYSTEM AUDIO 1347 05235P3 l 1000 Pf EACH AUBIQ ISP
32. ne is sounded whenever the Push To Talk key is pressed and the radio has acquired a channel This tone indicates the user can begin communications CALL QUEUED If one short high pitched tone sounds after the transmitter is keyed this indi cates that the system has placed the re quest in a queue This tone sounds at both the transmitting unit and the receiving unit s indicating to the user on the re ceiving end that a call is being directed to them If the PTT is unkeyed while in the queue the radio autokeys automat ically keys Push To Talk when a chan nel becomes available see AUTOKEY AUTOKEY When the PTT is keyed to place a call on the system but the PTT is released be fore getting to the channel e g a queued call the radio automatically keys on the channel when it gets the assignment The radio generates a long beep and holds the transmitter keyed for two seconds Press ing the PTT button keeps the channel and sends the message before this two sec ond time out has expired SYSTEM BUSY If you press the PTT key and hear three short medium pitched tones this indi cates that the receiving party is already on the system or the system is busy and its queue is full You must rekey later to access the system CALL DENIED Asingle low pitched beep sounds when the PTT key is pressed and the request is denied by the system This happens if the OUT OF RANGE SYSTEM INOPERATIVE unit is an invalid user or if th
33. o activate the Call Retry state and display RETRYING in the display Retrying causes the radio to revert to Idle mode and scan for an incoming call while trying to acquire a free repeater approximately every 5 seconds for a 2 minute pe riod LBI 38848D HARDWARE AND HARDWARE OPTIONS The location and placement of system hardware options are shown on Sheet 4 of the 800 MHz Dual Format MDX Mobile Interconnect Diagrams OPTION CABLE Option Cable Option PMCD7Z 19C851585P14 is used to bring all option connections from the System Board through the back of the radio to the outside This cable is required with all external options NOISE SUPPRESSION KIT OPTION Noise Suppression Kit Option PMPDIA consisting of Filter 194148539 1 and Installation Manual LBI 31363 is available for installations where excessive alternator or elec trical noises present on the power cable do not permit the radio to operate properly Refer to the interconnect diagram for the radio and options POWER CABLE OPTION 18 foot Power Cable Option PMCD9A 19B801358P17 is available for installations requiring more than the standard 9 foot cable EXTERNAL SPEAKER OPTION External Speaker and Cable Option PMZM1T provides the user with a five inch waterproof speaker in a LEXAN housing PMCC9M is an 18 inch interconnecting cable for the speaker The radio s 10 watt amplifier drives the speaker s 4 ohm impedance The speaker leads are con nected t
34. o pins 2 and 9 of Option Cable Option PMCD7Z 19C851585P14 using External Speaker Cable Option PMCC9M 19A149590P8 18 inches included in the PMZMST kit A 16 foot cable Option PMCDIW 194149590 10 is also available EXTERNAL ALARM External Alarm Horn Relay Option PMSUIC 194705499 1 can sound the vehicle horn when a call is received The option connects to pin 13 of Option Cable Option PMCD7Z 19C851585P14 and is controlled by a front panel option switch SYSTEM DESCRIPTION EDACS The Dual Format MDX mobile radio operates in either EDACS digital mode or in GE MARC tone mode pro viding customers another dimension of flexibility in opera tion Both modes provide opportunities to increase RF channel utilization through faster channel access and the privacy inherent with selective signalling The EDACS system uses 9600 baud high speed digital signalling to identify individual units user groups fleets and agencies Agencies contain multiple fleets and fleets contain multiple user groups sub fleets By using this ad dressing scheme large user groups can be accessed simulta neously all the way down to individual users The programming to determine transmit encoded groups and decoded received groups is contained in the personality EEPROM of the mobile This information is individually programmed to suit each users needs via the PC programmer for the radio The typical system configuration consists of at least 2
35. repeater stations with a maximum number of 25 and the associated mobiles One repeater always is a control channel dedicated to sending out continuous control data and also to receive channel request data from the mobiles When a mobile is first turned on it scans the available list of frequen cies programmed in the personality EEPROM for a control channel When a control channel is found the mobile locks on to the frequency and monitors the data for a channel assignment incoming call When receiving a channel assignment incoming call the monitoring mobile immediately switches over to the assigned voice channel and waits for a high speed data confirmation message Upon receipt of this message the voice paths are unmuted and the user can hear the call While on the voice channel the mobile also continu ously monitors the low speed 150 baud subaudible data and carrier noise squelch to ensure consistent operation Upon loss of subaudible data reception i e deep fade or out of range the mobile returns to the control channel frequency To initiate a call the user keys the radio which is locked to the control channel and a 30 millisecond high speed data slotted channel request is transmitted to the control channel receiver The control channel processes the request from the mobile and transmits back a voice channel assignment on an unused channel When all available voice channels are in use the control channel places th
36. sssssssssssssssssisissizsi3s3s8 139 95 amens R RASSA KRR SSA AL QUT 1097261 12333P57 SAA EOE 5 gt INTERNAL CONNECTOR gud n 3 E Pe no ANTENNA TNC gt 10 ANTENNA CONNECTOR 1 gt NOTE WHEN ORUERING PLEASE REMEMBER THAT ALL OPTION CODES FOR THIS PRODUCT ARE PRECEDED BY THE PRODUCT CODE PM EG PMANIL 190904133 Sh 2 Rev 2 10 INTERCONNECTION DIAGRAM LBI 38848D oS ee oe rcc 1 1 OPTION ZMIK CONTAINS THE SPEAKER AND 18 INCH CABLE c PE S55 OPTION NUMBER OPTIONS AVAILABLE EGE NUMBER 2 d IND ANIL ANTENNA 800 MHZ ROOFTOP INC 13H208368P5 N POR lt PORER CABLE 3 FEET 13890135818 l 3 boum 7 E COSA POWER CABLE 18 FEET 188801358 17 e m b Ee feum WEATHERPROOF STANDART NICROPHONE 188804348 14 da 24 EXTERNAL HIL SPEC MICROPHONE 18080 433P15 EXTERNAL EXTERNAL SPEAKER MIC HANGER ANIM ANTENNA 300 MHZ ROOFTOP TNC 19880 1 2 3 SPEAKER SPEAKER 194149590 1 LSIF WATER PROOF SPEAKER 1 X S 19414959 4P1 lt CABLE 8INCH OPTIONCDIW CCIH EXTERNAL SPEAKER CABLE 18 INCHES 180149508 8 l 194149590 10 19414959
37. ur tones and busy tone before entering the Ready mode If a two tone sequence is sent the busy tone must be present within 90 milliseconds of the last LBI 38848D CONTROL HOOKSWITCH DISPLAY BD MICROPHONE EARPIECE AUDIO AUDIO MICRO PROCESSOR AND PROGRAM MEMORY PERSONALITY PROM DLYD PTT SIGNAL AUDIO EXT SPKR PROCESSOR AMPL HI VOL SQ HI RECEIVER TRANSMITTER SYNTHESIZER AUDIO MUTED _ BUSY TONE ACG VOICE TONE COLLECT TOME GROUP TONE m NEW REPEATER BUSY GE MARC Y TONE COLLECT TONE GROUP TONE WOICE OTMF BUSY SIGNALING ps T aio MUTED BUSY COLLECT TONE BUSY TONE BUSY MUTED NEM REPEATER GE MARC VeE uad SIGNALING COLLECT TONE 1 TONE 2 TONE 3 BUSY mm TONE 1 TONE 2 TONE 3 MOBILE R NOT ACS GE MARC VeE BUSY TONE l l 0 0 5 VERIFY REPEATER TONES BUSY 1 0 1 5 Figure 1 GE MARC Block Diagram tone in order for the radio to enter the Ready mode If no busy tone is present or if the four tone sequence isn t valid the mobile will jump to the next channel in the call originate set and check for busy tone as described above Ready Mode When an incoming call has b
38. y adjust able for rated power Thermistors in the control circuit protect the PA from overheating by reducing the power output level Receiver The dual conversion receiver circuit consists of a front end section 45 3 MHz first IF a 455 kHz second and FM detector All audio processing and squelch functions are ac complished on the Audio Board POWER AMPLIFIER BOARD The PA board 19C851822G1 amplifies the RF board output then connects it back to the RF board where it is coupled through a PIN diode antenna switch the low pass filter and the directional coupler to provide 25 watts power output at the antenna connector Table 1 Standard Tone Frequencies Hz 67 0 71 9 74 4 77 0 79 7 82 5 100 0 103 5 107 2 110 9 114 8 118 8 85 4 88 5 91 5 94 8 97 4 123 0 127 3 131 8 136 5 141 3 146 2 151 4 156 7 162 2 167 9 173 8 179 9 186 2 192 8 203 5 210 7 modulation of co channel stations may false Channel Guard decoders 1 Do not use 179 9 Hz or 118 8 Hz in areas served by 60 Hz power distribution systems 100 0 Hz or 151 4 Hz in areas supplied with 50Hz power Hum 2 Do not use adjacent Channel Guard tone frequencies in systems employing multiple Channel Guard tones Avoid same areas co channel use of adjacent Channel Guard tones whenever possible As stated in EIA Standard RS 220 there is a possibility of decoder falsing 3 minimize receiver turn on time delay especially in system
39. y time periods between 30 seconds and 7 5 minutes can be programmed in 30 second increments The timer can be enabled or disabled for each channel Channel Guard Channel Guard provides a means of restricting calls to specific radios through the use of a Continuous Tone Coded Squelch System CTCSS or a Continuous Digital Coded Squelch System CDCSS Tone frequencies range from 67 0 Hz to 210 7 Hz in 0 1 Hz steps There are 83 standard PC programmable digital codes The Channel Guard tone frequencies and codes are software programmable Both tone frequencies and digital codes may be used These codes and frequencies are listed in Table 1 Channel Guard Tone Frequencies and Table 2 Digital Channel Guard Codes NOTE To reverse the polarity of the digital Channel Guard codes in the PC programmer type I inverted before the code number i e 1023 Squelch Tail Elimination STE STE is used with tone and digital Channel Guard to eliminate squelch tails The STE burst is transmitted when the microphone PTT is released The receiving radio decodes the burst and mutes the receiver audio for 250ms This mute time allows the transmission to end and to mute the squelch tail The radio looks for STE on the received signal when the microphone is either on or off hook The STE is enabled for transmit and or receive by PC programming the radio s per sonality Retry Option If no channel is free the radio can be programmed t
40. z 45 dB Within 1 3 dB of a 6 dB octave pre emphasis curve from 300 3000 Hz 851 0125 869 9875 MHz 2 5 kHz minimum 113 dBm minimum 70 dB minimum 68 dB minimum at 25 0 kHz 65 dB minimum Within 2 8dB of a 6 dB octave de emphasis curve from 300 2700 Hz 10 Watts External Speaker 4 Watts Internal Speaker 5 maximum at 1 kHz GENERAL DESCRIPTION The Dual Format MDX Mobile Radio is a synthesized wideband radio that uses integrated circuits and microcom puter technology to provide high performance trunked opera tion This radio operates in the Enhanced Digital Access Communications System EDACS GE MARC trunking en vironments and in conventional communications systems The radio provides 25 Watts of RF power output in the 806 0125 824 9875 MHz and 851 0125 869 9875 MHz bands The re ceiver operates in the 851 0125 869 9875 MHz band All radio functions are stored in a programmable Electri cally Erasable PROM EEPROM The radio is field pro grammable using an IBM compatible personal computer with the following equipment 9 Serial Programming Interface Module TQ3370 9 Programming Cable 19B801417P10 TQ3372 9 MDX Series Programming Software EDACS TQ3373 9 MDX Series Programming Software GE MARC only TQ3346 With the interface equipment and software the computer can be used to program or re program customer system frequencies Channel Guard tones and options Selection of options is don
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