NEW SQUELCH TEST. - TM-11-5820-401-34-30372

+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