Coupler Test

TM 11-6625-1702-35

Figure 4-5. Coupler test, test setup.

4-8. Coupler Test

(fig. 4-5)

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.

b. Test Connections and Conditions. Connect the test equipment as shown in figure 4-5. Use the test

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