AM MODULATION ADJUSTMENT.

TM 11-6625-2975-40

2-20. AM MODULATION ADJUSTMENT.

TEST EQUIPMENT REQUIRED: Adapter, N plug-to-BNC jack

Modulation Analyzer HP 8901

RF Cable RG-58/U

EQUIPMENT SETUP Connect test set to 115 vac power source.

Connect modulation analyzer to test set as indicated in the following diagram.

EL9LY021

Turn on equipment. Allow at least 30 minutes for warmup.

PROCEDURE

1. Enter frequency 110.10 MHz into test set.

2. Extinguish 150 Hz TONE SELECT key.

NOTE

90 Hz TONE SELECT key remains lit.

3. Press (to light) % MOD FUNCTION/CONTROL key.

NOTE

RDL/DDM/MOD key indicates 20.0 MOD (%).

4. Reduce RF LEVEL to -6 dBmW.

P/O A3/A4 ASSEMBLY TOP BRACKET

EL9LY030