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|  TM 11-5820-509-35
Paragraph
Page
Transmitter hum balance adjustment................................................................................................................................. 5-5
5-2
Transmit mixer balance and tgc adjustment....................................................................................................................... 5-4
5-1
Transmitter modulation fidelity test...................................................................................................................................... 5-6
5-3
Transmitter spurious output adjustments ........................................................................................................................... 5-7
5-4
Description, general theory ........................................................................................................................................................ 2-4
2-3
Frequency control circuits ................................................................................................................................................. 2-7
2-9
Power supply circuits ........................................................................................................................................................ 2-8
2-12
Receive signal path ............................................................................................................................................................ 2-5
2-8
Transmit signal path .......................................................................................................................................................... 2-6
2-9
DT support maintenance............................................................................................................................................................ 3-1
3-1
General troubleshooting techniques .................................................................................................................................... 3-1
3-1
Tools, test equipment, and materials................................................................................................................................... 3-2
3-2
Cable Assembly Set AN/PRA-4 (chart) .......................................................................................................................... 3-2
3-2
Direct support troubleshooting ................................................................................................................................................... 3-3
3-3
Overall troubleshooting ...................................................................................................................................................... 3-3
3-3
Radio Receiver-Transmitter RT-671/PRC-47 (AH) ..................................................................................................... 3-4
3-3
Localizing trouble ................................................................................................................................................... 3-5
3-75
Frequency generation circuits (chart) .............................................................................................................. 3-5c
3-81
Power distribution circuits (chart, common parts) ........................................................................................3-5b (3)
3-77
Power distribution circuits (chart, 26.5 vdc) ...............................................................................................3-5b (2)
3-76
Power distribution circuits (chart, 115 vac) .................................................................................................3-5b (1)
3-75
Receiver circuit tests (chart) ........................................................................................................................................ 3-5d
3-82
Relay and mode control tests (chart) ............................................................................................................... 3-5f
3-85
Transmitter circuit tests (chart) ....................................................................................................................... 3-5e
3-83
Receiver test setup and initial settings .............................................................................................................3-4b (2)
3-73
Sectionalizing trouble (chart)................................................................................................................................... 3-4
3-3
Short circuit tests (chart) ....................................................................................................................................... 3-4
3-3
Transmitter test setup and initial settings ................................................................................................................ 3-4
3-3
Distortion test, receiver audio output, general support .............................................................................................................. 4-12
4-7
EIectrical Equipment Chassis CH-474/PRC-47
Dc resistance, coils and transformer windings (chart) ........................................................................................................ 3-7
38
Field modifications (vox option) .......................................................................................................................................... 2-1
2-1
Historical revisions ............................................................................................................................................................ 1-4
1-1
Theory of operation .......................................................................................................................................................... 2-15
2-31
Equipment publication improvements, reporting of..................................................................................................................... 1-3
1-1
Field modification, vox mode operation ...................................................................................................................................... 2-1
2-1
Filter box, power amplifier (FL2), resistance of coils ................................................................................................................... 3-7
3-8
Frequency generation circuit tests, troubleshooting .................................................................................................................... 3-5
3-75
Frequency selection mechanism, assembly and disassembly .................................................................................................. 3-16
3-107
Frequency stability test, transmitter, general support ............................................................................................................... 4-16
4-14
Front panel removal and reassembly, main chassis and ........................................................................................................... 3-19
3-114
General description, theory ........................................................................................................................................................ 2-4
2-3
Frequency control circuits ................................................................................................................................................. 2-7
2-9
Power supply circuit . ...................................................................................................................................................... 2-8
2-12
Receive signal path ........................................................................................................................................................... 2-5
2-8
Transmit signal path .......................................................................................................................................................... 2-6
2-9
General removal and replacement procedures, repair ................................................................................................................ 3-8
3-95
Removal and replacement, case, receiver-transmitter ...................................................................................................... 3-11
3-97
Removal and replacement, plug-in modules..................................................................................................................... 3-12
3-97
Removal and replacement, power amplifier (A8A4A1) tube............................................................................................... 3-14
3-95
Removal and replacement, subminiature tube..................................................................................................................... 3-8
3-95
General replacement techniques, repair .................................................................................................................................... 3-8
3-95
General support maintenance .................................................................................................................................................... 4-1
4-1
Modification work orders..................................................................................................................................................... 4-4
4-1
Physical tests and inspection (chart) ................................................................................................................................. 4-5
4-1
Receiver audio output distortion test ................................................................................................................................ 4-12
4-7
Receiver avc characteristic tests ....................................................................................................................................... 4-7
4-4
Receiver if. rejection test .................................................................................................................................................. 4-9
4-6
Receiver image rejection test ............................................................................................................................................. 4-1
4-6
Receiver power input requirements .................................................................................................................................. 4-13
4-8
Receiver selectivity tests ................................................................................................................................................... 4-8
4-5
Receiver sensitivity tests .................................................................................................................................................... 4-6
4-2
Receiver volume control test............................................................................................................................................. 4-11
4-7
Test equipment required (chart) ......................................................................................................................................... 4-2
4-1
Test facilities ..................................................................................................................................................................... 4-3
4-1
Transmitter cw operation test .......................................................................................................................................... 4-18
4-17
Index-2
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