RECEIVER TONE SQUELCH SENSITIVITY TEST.

TM 11-5820-670-30

2-10. RECEIVER TONE SQUELCH SENSITIVITY TEST.

PURPOSE

This test checks the squelch capability when tone squelch is selected on the control unit. Squelching

and unsquelching in the TONE mode occur at various voltage levels.

TEST EQUIPMENT AND MATERIALS

Maintenance Kit MK-1035/ARC-131

Signal Generator AN/URM-103

Signal Generator AN/URM-127 (2 units required)

Spectrum Analyzer TS-723A/U

Electronic Counter Digital Readout AN/USM-207

Power Supply PP-2953/U

All cables are part of MK-1035/ARC

NOTE

When two AN/URM-127 units are tied together, they must have enough output to deviate

the fm signal generator at least 8 kHz.

Control Unit C-7088/ARC-131 installed in Test Set TS-2575/ARC-131 must contain a

jumper wire between E3 and E4 on switch rear mount marked TONE to perform tone

squelch sensitivity check.

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