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Figure 2-21. Packing Static Sensitive Modules
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TM-11-5820-890-30-5 Ground Non-Icom Radio Sets Consisting of: Receiver-Transmitter Radio RT-1439/VRC (NSN 5896-01-195-0827) Manual
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AMPLIFIER-ADAPTER,  VEHICULAR  AM-7239/VRC  OR  AM-7239B/VRC


TM 11-5820-890-30-5 CHAPTER 3 MAINTENANCE  GROUP  OA-9263A/GRC MAINTENANCE   INSTRUCTIONS Subject Section Principles of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I Repair Parts, Special Tools, TMDE, and Support Equipment . . . . . . . . . . . . . . . . . . . . . . . II Service Upon Receipt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . III Preventive Maintenance Checks and Services (PMCS) . . . . . . . . . . . . . . . . . . . . . . . . . . . IV Troubleshooting Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V Maintenance Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VI Preparation for Storage or Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Vll Section  I.  PRINCIPLES  OF  OPERATION Subject Para Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 Receiver-Transmitter, Radio RT-1439/VRC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 Amplifier-Adapter, Vehicular AM-7239/VRC or AM-7239B/VRC . . . . . . . . . . . . . . . . . . . . . 3-3 Mounting Base, Electrical Equipment MT-6352/VRC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4 Fill  Device,  Electronic  Counter-Countermeasures  MX-10579/VRC  or  MX-18290/VRC  .  .  .  3-5 lnterconnecting Device J-4501/GRC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6 Test Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7 3-1. INTRODUCTION. Page 3-1 3-20 3-21 3-24 3-25 3-86 3-111 Page 3-1 3-1 3-2 3-2 3-2 3-2 3-15 Maintenance Group OA-9263A/GRC is used to test and troubleshoot the radio set components. It is made up of the  following: Receiver-Transmitter,  Radio  RT-1439/VRC Amplifier-Adapter,  Vehicular  AM-7239/VRC  or  AM-7239B/VRC Mounting  Base,  Electrical  Equipment  MT-6352/VRC Fill  Device,  Electronic  Counter-Countermeasures  MX-10579/VRC  or  MX-18290/VRC Interconnecting  Device  J-4501/GRC The  COEl  list  in  Appendix  C  shows  the  items  found  in  the  maintenance  group. 3-2. RECEIVER-TRANSMITTER,  RADIO  RT-1439/VRC. One  RT-1439/VRC  is  included  with  the  maintenance  group.  The  RT  serves  as  a  reference  radio  (REF  RT)  for troubleshooting   and   operational   check   procedures.   It   functions   as   a   receiver   or   transmitter   when   used   to troubleshoot other RTs. lt helps test the operation of all RT modes: SC, FH, PT, CT, audio, and data. lt is mounted in  the  lower  slot  of  the  mounting  adapter  included  in  the  maintenance  group. Operating instructions are in TM 11-5820-890-10-3. Unit maintenance instructions are in TM 11-5820-890-20-2. If an  RT  is  determined  to  be  faulty,  see  chapter  2. 3-1


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