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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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