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 TM 11-6625-2975-40
2-20.
AM MODULATION ADJUSTMENT. (CONT)
5.
Locate A3A2 puts on right side of A3/A4 assemblies top bracket.
Adjust A3A2R2 until modulation analyzer indicates 20.0 0.5% AM.
6.
7.
Enter frequency 113.00 MHz into test set.
Extinguish 9960 FM TONE SELECT key.
8.
NOTE
30 Hz VAR TONE SELECT key remains Iit.
Press (to light) `/0 MOD FUNCTION/CONTROL key.
9.
NOTE
RDL/DDM/MOD display indicates 30.0 MOD (%).
Adjust A3A2R4 until modulation analyzer indicates 30.0 0.75% AM. Record exact value.
10.
Extinguish 30 Hz VAR TONE SELECT key.
11.
Press (to light) 9980 Hz TONE SELECT key. Record exact modulation analyzer indication.
12.
13.
Add value recorded in step 12 to value recorded in step 10. Divide the sum by 2.
Adjust A3A2R4 until average calculated in step 13 is 30.0 0.75 percent.
14.
Enter frequency 332.00 MHz into test set.
15.
Extinguish 150 Hz TONE SELECT key.
16.
NOTE
90 Hz TONE SELECT key remains lit.
17.
Press (to light) `/0 MOD FUNCTION/CONTROL key.
NOTE
RDL/DDM/MOD display indicates 40.0 MOD (%).
Adjust A3A2R3 until modulation analyzer Indicates 40.0 1.0% AM.
18.
19.
Enter frequency 75.00 MHz Into test set.
20.
Select 1300 Hz TONE SELECT key.
Press (to light) 0/0 MOD FUNCTION/CONTROL key.
21.
NOTE
RDL/DDM/MOD display indicates 95.0 MOD (%).
Adjust A3A2R1 until modulation analyzer Indicates 95 2.37 AM.
22.
2-35
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