REMOTE 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

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

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