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 TM 11-6625-2975-40
2-19. AUDIO TONE LEVEL ALINEMENT.
TEST EQUIPMENT REQUIRED: Differential Voltmeter, Fluke 887 AB/AN
RF Cable RG-58/U with BNC plug-to-double banana plug
terminations
EQUIPMENT SETUP: Connect test set to 115 vac power source.
Connect differential voltmeter to test set as indicated in the following diagram.
TEST SET
COMP AUX
DIFFERENTIAL
(REAR OF CHASSIS)
E L9LY029
Turn equipment on. Allow at least 30 minutes for warmup.
PROCEDURE
EL9LY030
P/O A3/A4 ASSEMBLY TOP BRACKET
1.
Enter VOR frequency 108.00 MHz into test set.
Locate A2A2 pots on left side of A3/A4 assemblies top bracket.
2.
3.
Adjust A2A2R12 until differential voltmeter indicates 1.000 0.0002 v rms.
4.
Disconnect differential voltmeter from test set AUX connector and connect to COMP connector.
Turn A2A2R9 fully clockwise.
5.
6.
Extinguish 9960 FM TONE SELECT key.
2-32
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