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 TM 11-6625-2975-40
2-25. VOR RADIAL ADJUSTMENT. (CONT)
PROCEDURE
1.
Set test set to standard VOR signal at 116.000 MHz.
2.
Adjust zifor Ill balance control for a minimum reading (null) on the differential voltmeter,
P/O A3/A4 ASSEMBLY TOP BRACKET
EL9LY063
Fine tune both the zifor Ill amplitude balance control and A2A2R8 (1) to obtain a null on the
3.
differential voltmeter.
4.
Set the test set to 359.98 degree radial.
5.
Check that null voltage Increases from step 3.
6.
Set the test set to 0.02 degree radial.
7.
Check that null voltage increases from step 3.
8.
Disconnect input to COMP connector on rear panel of test set and connect it to DEMOD.
9.
Obtain null on differential voltmeter by stepping test set radial in + or -0.01 degree increments
and adjusting zifor Ill amplitude balance control for a null at each step. Determine step where
best null occurs. Best null will occur near 0 degrees.
10.
Check that the test set RDL/DDM/MOD radial indication Is 0.00 0.05 degrees with best null
obtained in step 9.
11.
Disconnect zifor Ill from test set.
Turn off all equipment.
12.
13.
Connect equipment as shown in the following diagram.
EL9LY065
Turn on all equipment. Allow at least 5 minutes for warmup,
14.
Set test set to 30 Hz VAR tone only at a 0 degree radial.
15.
Adjust A2A2R11 (2) for 0.00 0.10 degree phase difference.
16.
17.
Set test set to 180 degree radial.
18.
Check that phase difference is 179.80 to 180.20 degrees.
19.
Turn test set off and disconnect phasemeter.
2-43
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