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+TM 11-5820-401-34-3/0967-LP-432-3060
5-3. RECEIVER SENSITIVITY TEST. (CONT)
Sensitivity Test at 52.00 MHz
Change R-442/VRC MC-TUNE-KC switch to 52.00 MHz and BAND to
.
28.
Turn AN/URM-103 BAND SWITCH to
and RF TUNING control for 52,00-MHz meter
29.
indication.
Reconnect TS-723(*)/U METER lead C to Test Cable No. 1 terminal F; reconnect lead D
30.
to terminal A.
Adjust AN/URM-103 RF TUNING control for 52.00-MHz display on AN/USM-207. To produce
31.
display, see note under step 2, and readjust RF TUNING control until AN/USM-207 indicates
52.00 MHz.
Repeat steps 3 through 12.
32.
Sensitivity Test at 75.00 MHz
33. Change R-442/VRC MC-TUNE-KC switch to 75.00 MHz and BAND to
.
34. Turn AN/URM-103 BAND SWITCH to
and RF TUNING control for 75.00-MHz meter
indication.
35. Reconnect TS-723(*)/U METER lead C to Test Cable No. 1 terminal F; reconnect lead D
to terminal A.
36. Adjust AN/URM-103 RF TUNING control for 75.00-MHz display on AN/USM-207. To produce
display, see note under step 2, and readjust RF TUNING control until AN/USM-207 indicates
75.00 MHz,
37. Repeat steps 3 through 12.
5-4. NEW SQUELCH TEST.
PURPOSE. This test checks the sensitivity of R-442/VRC squelch modules (A5200, A5300) to the
NEW SQUELCH signal (150 Hz) at several carrier frequencies. The 150-Hz signal is injected into the
R-442/VRC ANTENNA port, energizing Squelch Module Relay K5002, which unsquelches the receiv-
er. Proper operation of the squelch modules is verified by CALL lamp response to carrier signal
strength at or below a 0.5-v rf level.
TEST EQUIPMENT AND MATERIALS
Power Supply PP-1104(*)/G
Matching Unit CN-901/U
Frequency Counter AN/USM-207
Loudspeaker LS-454/U
Signal Generator AN/URM-103
Rf Cables (two) RG-58/U
Adapter (T-Connector) UG-274 B/U
Test Cable No. 1
5-8


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