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|  TM 11-5820-401-34-3/0967-LP-432-3060
4-5. OLD SQUELCH TEST. (CONT)
EQUIVALENT AN/GRM-114A THUMBWHEEL SETTING
R-442/VRC SWITCH SETTING
41.00
MHz
041000.0
Hz
052000.0
tiz
52.00
MHz
53.00
MHz
053000.0
Hz
65.00
MHz
065000.0
Hz
75.00
MHz
075000.0
Hz
4-6. RECEIVER AUDIO POWER TEST.
PURPOSE. This test checks the ability of the R-442/VRC to drive its three audio outputs, namely:
1. The MUTED audio output, which supplies power to the speaker.
2. The UNMUTED audio output, which supplies power to the headphones.
3. The FIXED LEVEL audio output, which supplies power to the interphone system.
An rf level strong enough to drive the A4200 module into limiting (20 v) is Injected into the R-442/VRC
ANTENNA port. The audio output voltages are then measured at the SPKR and INTERCOM jacks of the
MK-1978/VRC.
TEST EQUIPMENT AND MATERIALS
Test Set AN/GRM-114A
Power Supply PP-1104(*)/G
Rf Cable RG-58/U
Maintenance Kit MK-1978/VRC
TEST EQUIPMENT SETUP. Connect equipment as shown in test setup diagram
4-14
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