NEW SQUELCH TEST. - TM-11-5820-401-34-30224

TM 11-5820-401-34-3/0967-LP-432-3060

RECEIVER SENSITIVITY TEST. (CONT)

4-3.

STANDARD. MM-100E blue SINAD scale should indicate 10 or greater at each frequency.

7. If MM-100E indication falls below 10 at any frequency, see troubleshooting chart 4-2.

4-4.

NEW SQUELCH TEST.

PURPOSE. This test checks the sensitivity of the R-442/VRC squelch modules (A5200, A5300) to

the NEW SQUELCH signal (150Hz) 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

receiver. 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

Test Set AN/GRM-114A

Rf Cable RG-58/U

Maintenance Kit MK-1978/VRC

TEST SETUP. Connect equipment as shown in test setup diagram

INITIAL EQUIPMENT CONTROL SETTINGS. Set equipment controls as indicated in the following

table.

4-8