OLD SQUELCH TEST. - TM-11-5820-401-34-30098

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

3-4.

NEW SQUELCH TEST. (CONT)

24. Adjust AN/URM-103 RF TUNING control for 65.00-MHz display on AN/USM-207. To produce

display, see note under step 1 and readjust RF TUNING control until AN/USM-207 indicates

65.00 MHz.

25. Repeat steps 2 through 9.

NEW SQUELCH Test at 75.00 MHz

Change R-442/VRC MC-TUNE-KC switch to 75.00 MHz.

26.

Turn AN/URM-103 RF TUNING control for 75.00-MHz meter indication.

27.

Adjust AN/URM-103 RF TUNING control for 75.00-MHz display on AN/USM-207. To produce

28.

display, see note under step 1 and readjust RF TUNING control until AN/USM-207 indicates

75.00 MHz.

29.

Repeat steps 2 through 9.

3-5.

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- rf carrier

level.

TEST EQUIPMENT AND MATERIALS

Matching Unit CN-901/U

Power Supply PP-1104(*)/G

Frequency Counter AN/US M-207

Rf Cables (two) RG-58/U

Maintenance Kit MK-1978/VRC

Signal Generator AN/URM-103

Adapter (T-Connector) UG-274 B/U

3-12