Section II. OPERATING INSTRUCTIONS

TO 31R2-2GRC171-2

TM 11-5820-815-14

NAVELEX 0967-LP-544-5010

SECTION II

OPERATING INSTRUCTIONS

b. Set TEST switch to the following positions and

3-2. GENERAL.

verify proper indications on VOLT scale of TEST meter.

3-3. The operating instructions are divided into three

SWITCH POSITION

NORMAL INDICATION

parts: local operation, remote operation, and emer-

gency operation.

Local operation is primarily for

+26V

26 (1.5)

checkout and servicing. The normal mode of opera- tion

is remote. The operation of the AN/GRC-171 in local or

+22V

22 (1.5)

remote is the same for either standard bandwidth or

wide-band (secure voice) data. Emer- gency operation

+12V

12 (1.0)

describes certain steps that can be taken to establish or

maintain communication under adverse operating

+5V

5.1 (0.5)

conditions. If at any time the opera- tion of this unit

becomes abnormal, refer to the performance tests in

-12V

12 (1.0)

chapter 5, section I, of this manual.

c. Set MEGAHERTZ switches to an authorized

3-4. LOCAL OPERATION.

operating frequency. Observe that the READY lamp

lights.

3-5. The following paragraphs provide operating in-

structions for local (front panel) operation of the RT-

d. Adjust VOL control for suitable headset recep-

980/GRC-171.

tion. If squelch operation is desired, set SQUELCH

ON/OFF switch to ON.

3-6. PRELIMINARY SETUP.

NOTE

a. At RT-980/GRC-171 front panel, set switches

and controls to the following positions:

When PTT/CARRIER TEST switch is set to

CARRIER TEST position, any audio input will

CONTROL/SWITCH

POSITION

be transmitted.

NOTE

POWER ON/OFF

OFF

TEST

OFF

Before transmitting, the operator must be

certain that the equipment is operating on an

REMOTE/LOCAL

LOCAL

authorized frequency.

PTT/CARRIER TEST

PTT

e. Set PTT/CARRIER TEST switch to CARRIER

TEST position.

VOL

Approx

1/4 turn cw

f. Set TEST switch to FWD PWR position. TEST

meter should indicate 16 to 24 on the WATTS scale.

SQUELCH ON/OFF

OFF

g. Set TEST switch to REFLD PWR position. Test

b. Connect headset and microphone to appropriate

meter should indicate 0 to 25 percent of FWD PWR.

front panel jacks.

h. Return PTT/CARRIER TEST switch to PTT

3-7. OPERATION.

position.

a. Set POWER ON/OFF switch to ON. Verify that

Set TEST switch to % MOD position.

POWER indicator lamp lights.

NOTE

Allow approximately a 2-minute warmup and

then proceed with operating instructions.

3-7