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|  TM 11-5820-401 -34-3/0967- LP-432-3060
5-5. OLD SQUELCH TEST.
PURPOSE. This test checks the sensitivity of the R-442/VRC squelch modules (A5200, A5300) to
OLD SQUELCH noise components (7300 Hz) at several carrier frequencies. Proper operation of the
squelch modules is verified by CALL lamp response to signal strength at or below a 0.7-v rf carrier
level.
TEST EQUIPMENT AND MATERIALS
Matching Unit CN-901/U
Power Supply PP-1104(*)/G
Loudspeaker LS-454/U
Frequency Counter AN/USM-207
Rf Cables (two) RG-58/U
Signal Generator AN/URM-103
Test Cable No. 1
Adapter (T-Connector) UG-274 B/U
TEST SETUP. Connect equipment as shown in test setup diagram
.
T u r n on test equipment. Allow at least 15 to 30 minutes for warmup.
5-12
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