b. Set TEST switch to the following positions and
verify proper indications on VOLT scale of TEST meter.
3-3. The operating instructions are divided into three
parts: local operation, remote operation, and emer-
Local operation is primarily for
checkout and servicing. The normal mode of opera- tion
is remote. The operation of the AN/GRC-171 in local or
remote is the same for either standard bandwidth or
wide-band (secure voice) data. Emer- gency operation
describes certain steps that can be taken to establish or
maintain communication under adverse operating
conditions. If at any time the opera- tion of this unit
becomes abnormal, refer to the performance tests in
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
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-
tion. If squelch operation is desired, set SQUELCH
ON/OFF switch to ON.
3-6. PRELIMINARY SETUP.
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
Before transmitting, the operator must be
certain that the equipment is operating on an
e. Set PTT/CARRIER TEST switch to CARRIER
1/4 turn cw
f. Set TEST switch to FWD PWR position. TEST
meter should indicate 16 to 24 on the WATTS scale.
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
a. Set POWER ON/OFF switch to ON. Verify that
Set TEST switch to % MOD position.
POWER indicator lamp lights.
Allow approximately a 2-minute warmup and
then proceed with operating instructions.