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Table 3-1. AN/GRC-171 Controls and Indicators (Sheet 4 of 4)
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TM-11-5820-815-14 Service and Circuit Diagrams RADIO SET AN/GRC-171 Manual
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REMOTE OPERATION.


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
i.
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


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