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  TM 11-6625-1702-35
Figure 4-8. RF wattmeter test setup.
4-9.
RF Wattmeter Test
a. Test Equipment and Materials
(1) Power supply, 28-volt.
( 2 ) Radio Set AN/ARC-131.
( 3 ) Dummy Load, Electrical DA-75/U.
( 4 ) Wattmeter AN/URM-120.
(5) Cable Assembly, Radio Frequency CG-3375/U.
b. Test Connections and Conditions.
(1) For step No. 1, connect the test equipment as shown by solid lines in figure 4-6.
(2) For step No. 2, connect the test equipment as shown by broken lines in figure 4-6.
c. Procedure.
Control
settings
Step
Test
equipment
Equipment under test
No.
Test
procedure
Performance
standard
1 a. Apply power to a. N o n e - - - - - - - - - - - - - - - - - - a. Adjust fm transmitter a. None.
fm transmit-
frequency to 30 MHz.
ter, and allow
Measure forward rf
time for
power
with
AN/
warm up.
URM-120 and record
reading.
b. None -------------- b. None ------------------------ b. Measure reflected RF b. None.
power
AN/
with
URM-120, and record
reading.
c. None ------------ c. N o n e
c. Adjust fm transmitter c. None.
frequency to 76 MHz.
Measure forward RF
power
with
AN/
URM-120, and record
reading.
4-7
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