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Table 5-3. Radio Receiver-Transmitter RT-980/GRC-171 Performance Tests (Sheet 9 of 17)
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TM-11-5820-815-14 Service and Circuit Diagrams RADIO SET AN/GRC-171 Manual
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Table 5-3. Radio Receiver-Transmitter RT-980/GRC-171 Performance Tests (Sheet 11 of 17)


TO 31R2-2GRC171-2
TM 11-5820-815-14
NAVELEX 0967-LP-544-5010
Table 5-3. Radio Receiver-Transmitter RT-980/GRC-171 Performance Tests (Sheet 10 of 17)
CONTROL SETTINGS
OPERATION OF TEST
AND OPERATION
PERFORMANCE
STEP
EQUIPMENT
POINT OF TEST
OF EQUIPMENT
STANDARD
TRANSMITTER POWER OUTPUT, REFLECTED POWER, AND FREQUENCY
NOTE
The following steps require the transmitter to be keyed. Transmitter duty cycle is
9 minutes on and 1 minute off.
44
Connect equipment as
shown in figure 5-6.
Set variable attenua-
tor to 60 dB.
45
While transmitter is
XCVR
Set frequency
Forward power: 16 to
keyed, reduce variable
(A10W3J2)
switches to 300.000
24 watts. Reflected
attenuator until fre-
MHz and PTT/
power: Not more than
quency counter stabilizes
CARRIER TEST to
forward power divided
(between 20 and 10
CARRIER TEST.
by 4. Frequency:
dB). After observing
Observe watt-
300.000 0.0015 MHz.
forward power, set
meter and fre-
wattmeter for reflected
quency counter.
power and observe
reflected power.
46
Repeat step 45 for
Forward and reflected
225.000 MHz.
power same as step 45.
Frequency: 225.000
0.001125 MHz.
47
Repeat step 45 for
Forward and reflected
399.975 MHz.
power same as step 45.
Frequency: 399.975
0.001999 MHz.
48
Set REMOTE/LOCAL
switch to LOCAL,
PTT/CARRIER TEST
switch to PTT,
POWER switch to
ON.
49
XCVR
Set 100-MHz digit
Frequency set on fre-
(A10W3J2)
of frequency selec-
quency select switches
tor switches to
+ 1.125 kHz. If error
position 3 And
exceeds 1.125 kHz,
turn each of the
compute actual allow-
remaining switches
able frequency range
through its range.
(selected frequency
Key transmitter at
+ 0.0005%).
each selected fre-
quency and observe
frequency counter.
5-16


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