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Table 5-3. Radio Receiver-Transmitter RT-980/GRC-171 Performance Tests (Sheet 8 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 10 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 9 of 17)
CONTROL SETTINGS
OPERATION OF TEST
AND OPERATION
PERFORMANCE
STEP
EQUIPMENT
POINT OF TEST
OF EQUIPMENT
STANDARD
NOISE BLANKER (Cont)
38
Connect equipment as
AUDIO OUTPUT
Set REMOTE/'LOCAL
shown in figure 5-5.
(A10A2J22-N/S)
switch to LOCAL,
Set rf signal generator
PTT/CARRIER TEST
A for 300.000 MHz,
to PTT, SQUELCH
30% modulation at
switch to OFF, and
400 Hz with rf output
frequency switches to
level of 6 ÁV (3 ÁV
300.000 MHz.
at RT-980/GRC-171
XCVR jack). Set rf
signal generator B
for minimum output.
39
Using the distortion
10 dB or greater.
analyzer (distortion
function and null 400-
Hz modulation frequency),
measure RT-980/GRC-
171 signal/noise and
record value.
40
Adjust pulse generator
for a 10-is, 2-V
amplitude, 300-prf
pulse. Adjust rf signal
generator B for 100-
ÁV pulse modulated
output.
41
Using the distortion
Less than 1.5-dB
analyzer, measure
degradation from
and record RT-980/
value measured in
GRC-171 signal/
step 39.
noise.
42
With RT-980/GRC-171
Disable RT-980/
At least 4 dB greater
noise blanker disabled,
GRC-171 noise
than value measured
measure RT-980/
blanker by
in step 41.
GRC-171 signal/noise
grounding NOISE
with the distortion
BLANKER DIS-
analyzer.
ABLE (A10A2J22-j).
43
Repeat steps 40 through
Step 41 will have less
42 using a modulation
than 2-dB degradation
pulse of 10-ps, 2-V
from value measured
amplitude, and 1500
in step 39.
prf.
Step 42 will be at least
4 dB greater than value
measured in step 41.
5-15


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