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Table 5-3. Radio Receiver-Transmitter RT-980/GRC-171 Performance Tests (Sheet 3 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 5 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 4 of 17)
CONTROL SETTINGS
OPERATION OF TEST
AND OPERATION
PERFORMANCE
STEP
EQUIPMENT
POINT OF TEST
OF EQIPMENT
STANDARD
RECEIVER SQUELCH (Cont)
17
RELAY NC and
(Cont)
SQUELCH RELAY
COM (A10A2J22-Z/a).
Set vom for continuity
check.
18
Observe distortion analy-
AUDIO OUTPUT
AUDIO OUTPUT: 7.25
zer and vom.
(A10A2J22, pins
to 9.0 V rms.
N and S),
SQUELCH RELAY
SQUELCH RELAY
COM to NC continuity:
Not less than 100 kΩ.
NC (A10A2J22-Z)
and SQUELCH
RELAY COM
(A10A2J22-a)
19
Increase modulation to
Measure audio
AUDIO OUTPUT
90%. Observe distor-
output increase
increase: Not more
tion analyzer and vom.
in dB from that
than 3 dB. SQUELCH
measured in step
RELAY COM to NC
18.
continuity: Not less
than 100 kΩ.
20
Reduce signal level to 25
Observe squelch
AUDIO OUTPUT volt-
ÁV. Observe distortion
gate closes and
age: Not more than
analyzer and vom.
note audio output
0.1 V rms. SQUELCH
voltage.
RELAY COM to NC
continuity: Not more
than 1Ω.
21
Observe distortion
Set SQUELCH
AUDIO OUTPUT volt-
analyzer and vom.
switch to OFF.
age and SQUELCH
RELAY COM to NC
continuity returns to
levels measured in
step 19.
22
Repeat step 20
Same as step 20.
with REMOTE/
LOCAL switch
set to REMOTE
and C-7999/
GRC-171 fre-
quency switches
set to 300.000
MHz and
SQUELCH
switch set to
ON.
5-10


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