TM 11-6625-1702-35
Figure 4-5. Coupler test, test setup.
4-8. Coupler Test
a. Test Equipment and Materials.
(1) Power supply, 28-volt dc.
(2) Radio Set AN/ARC-131 or equivalent.
(3) Antenna Coupler, 437S-1/1A.
leads supplied. Mount the antenna coupler on the ground plane supplied.
c. Procedure.
Control
settings
Step
No.
Test equipment
Performance standard
Equipment under test
Test procedures
1 a. Turn on power
a. Set RF SELECT switch
a. Adjust power supply to
a. Test set meter indicates
supply and
to OUTPUT. Set
2'7.5 1.3 volts dc.
obtain a 27.5-volt dc
fm transmit-
METER FUNCTION
indication on power
ter. Allow
switch to 28VDC. Set
supply meter.
time for
MANUAL TUNE
warm up.
switch to OFF.
b. None . . . . . . . . . . . . . . .b. None. . . . . . . . . . . . . . . . . . . . . .b. Apply RF power to the
b. TUNE INDICATOR
should be lighted.
test panel, and check
for proper cyclic ac-
tion of the coupler.
c. None . . . . . . . . . . . . .. .c. None . . . . . . . . . . . . . . . . . . . .. .c. When coupler has been
c. TUNE INDICATOR ex-
cycled to minimum
tinguishes and coupler
capacity and is mov-
stops.
ing toward maximum
capacity, remove RF
power from test set.
4-6
Change 2
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