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Section II. OPERATING INSTRUCTIONS
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TM-11-5820-815-14 Service and Circuit Diagrams RADIO SET AN/GRC-171 Manual
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Section III. EMERGENCY OPERATION


TO 31R2-2GRC171-2
TM 11-5820-815-14
NAVELEX 0967-LP-544-5010
j.  Key transmitter and observe TEST meter while
speaking into microphone. Needle deflection between 0
NOTE
and 95 on % scale indicates carrier modulation. When
transmission is complete, release key.
The READY indicator and PTT/CARRIER
TEST,
SQUELCH
ON/OFF,
and
k.
Set TEST switch to OFF position.
MEGAHERTZ switches on RT-980/GRC-
171 front panel are inoperative as long as
l.  To  shut  down  the  RT-980/GRC-171,
set
REMOTE/LOCAL switch is in REMOTE.
POWER ON/OFF switch to OFF.
3-11.
OPERATION.
3-8. REMOTE OPERATION.
a. At Radio Set Control C-7999/GRC-171, set
3-9. The following paragraphs provide operating in-
PWR ON/OFF switch to ON. READY lamp lights.
structions for remote operation of the RT-980/ GRC-171
from the C-7999/GRC-171.
NOTE
3-10.
PRELIMINARY SETUP.
Allow approximately a 2-minute warmup and
then proceed with operating instructions.
a. At C-7999/GRC-171 front panel, set switches
and controls as follows:
b. Set FREQUENCY switches to an authorized
operating frequency. Observe that READY lamp is lit.
CONTROL/SWITCH
POSITION
c.  Adjust VOL control for suitable headset recep-
PWR ON/OFF
OFF
tion.
If squelch operation is desired, set SQLCH
ON/OFF switch to ON.
SQLCH ON/
OFF
OFF
NOTE
VOL
Approx 1/4 turn cw
Before transmitting, the operator must be
certain that the equipment is being operated on
b. At RT-980/GRC-171 front panel, set switches
an authorized frequency.
and controls as follows:
d. To transmit, key transmitter and speak into
CONTROL/SWITCH
POSITION
microphone.  When transmission is complete, release
key.
REMOTE/LOCAL
REMOTE
e. To shut down the RT-980/GRC-171, set PWR
TEST
OFF
ON/OFF switch on C-7999/GRC-171 to OFF.
POWER ON/OFF
ON (POWER lamp will not
light until PWR ON/OFF
switch at C-7999/GRC-171
is set to ON.)
3-8


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