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Table 5-3. Radio Receiver-Transmitter RT-980/GRC-171 Performance Tests (Sheet 4 of 17)
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TM-11-5820-815-14 Service and Circuit Diagrams RADIO SET AN/GRC-171 Manual
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Table 5-3. Radio Receiver-Transmitter RT-980/GRC-171 Performance Tests (Sheet 6 of 17)


TO 31R2-2GRC171-2
TM 11-5820-815-14
NAVELEX 0967-LP-544-5010
Table 5-3. Radio Receiver-Transmitter RT-980/GRC-171 Performance Tests (Sheet 5 of 17)
CONTROL SETTINGS
OPERATION OF TEST
AND OPERATION
PERFORMANCE
STEP
EQUIPMENT
POINT OF TEST
OF EQIPMENT
STANDARD
RECEIVER SQUELCH (Cont)
23
Set rf signal generator for
Set REMOTE/LOCAL
7.25 to 9.0 V rms.
rf input level of 3 ÁV at
switch to LOCAL and
300.00 MHz, 30%
SQUELCH switch to
modulation at 1 kHz.
ON. Adjust
SQUELCH level
control counter-
clockwise until
audio output signal
is just obtained.
Observe the audio
output voltage.
24
Remove rf signal
Not more than 0.03
input. Observe
V rms.
that squelch gate
closes and note
audio output
voltage.
RECEIVER HEADSET AUDIO
25
With the equipment set up
HEADSET
Adjust VOL con-
7.75 V rms.
as in step 17, connect
OUTPUT
trol to obtain
600-ohm load and dis-
(A10A1J3)
output level of
tortion analyzer to
100 mW (7.75
RT-980/GRC-171
V rms).
HEADSET OUTPUT
(A10A1J3).
RECEIVER NARROW-BAND AUDIO RESPONSE
26
Connect equipment as
AUDIO OUTPUT
Set REMOTE/LOCAL
shown in figure 5-2. Set
(A10A2J22-N/S)
switch to LOCAL,
rf signal generator for
PTT/CARRIER TEST
rf input level of 500 ÁV
switch to PTT,
at 300.000 MHz, 30%
SQUELCH switch to
modulation at 100 Hz
OFF, and frequency
to 10 kHz.
switches to 300.000
MHz.
27
Set rf signal generator for
Observe and note
This measurement will
1000-Hz modulation
the audio output
be a reference for
signal.
level.
measurements taken in
step 28.
5-11


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