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Table 5-3. Radio Receiver-Transmitter RT-980/GRC-171 Performance Tests (Sheet 12 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 14 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 13 of 17)
CONTROL SETTINGS
OPERATION OF TEST
AND OPERATION
PERFORMANCE
STEP
EQUIPMENT
POINT OF TEST
OF EQUIPMENT
STANDARD
NOTE
Squelch relay, A9K1, is a mercury-wetted contact type relay. For the squelch relay to
function properly, the RT-980/GRC-171 must be in its normal operating position.
60
Connect rf load to
TEST meter
Set RT-980/GRC-171
RT-980/GRC-171
(A10A1M1)
switches as follows:
antenna connector
(J9 rear panel).
REMOTE/LOCAL to
Connect C-7999/
REMOTE, PTT/
GRC-171 to RT-
CARRIER TEST to
980/GRC-171.
PTT, SQUELCH to
OFF, TEST meter
selector to FWD
PWR, and POWER
to ON.
61
Set C-7999/GRC-171
switches as follows:
PWR to ON, SQLCH
to OFF.
NOTE
Inspect audio module A4 and keyer module A9 to determine strapping options used.
Perform applicable sections of steps 62, 63, and 66.
62
TEST meter
a. Key transmitter
a. Power indication
(A10A1M1)
by grounding the
TEST meter.
center tap of the
AUDIO INPUT
(A10A2J22-D/E)
thru a 3300-ohm
resistor. Ob-
serve the trans-
mitter is keyed.
b. Adjust power supply
b. Observe the
b. Power indication on
for 6-V dc output and
transmitter is
TEST meter.
connect the power sup-
keyed.
ply voltage output to
RT-980/GRC-171
connector A10A2J22-
(Cont)
D/E.
5-19


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