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Page Title:
Table 5-3. Radio Receiver-Transmitter RT-980/GRC-171 Performance Tests (Sheet 3 of 17) |
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|  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 3 of 17)
CONTROL SETTINGS
OPERATION OF TEST
AND OPERATION
PERFORMANCE
STEP
EQUIPMENT
POINT OF TEST
OF EQIPMENT
STANDARD
RECEIVER SIGNAL-PLUS-NOISE TO NOISE RATIO (Cont)
12
Determine signal-plus-
AUDIO OUTPUT
Not less than 10 dB.
noise to noise ratio as
(A10A2J22-N/S)
the dB decrease from
step 10 to step 11.
13
Repeat steps 7 through
Not less than 10 dB.
12 for the following
frequencies: 300.000
and 399.975 MHz.
RECEIVER WIDE-BAND AUDIO OUTPUT
14
Connect equipment as
shown in figure 5-2.
Connect 10-kΩ load
and distortion analyzer
to RT-980/GRC-171
DATA OUTPUT
(A10A2J22-L/M).
15
Set rf signal generator for
DATA OUTPUT
Set REMOTE/LOCAL
1.0 V rms or greater.
rf input level of 3.0 V at
(A10A2J22-L/M)
switch to LOCAL,
300.000 MHz, 30% modu-
PTT/CARRIER
lation at 1 kHz. Measure
switch to PTT,
wide-band audio output.
SQUELCH switch
to OFF, and fre-
quency switches
to 300.000 MHz.
16
Increase rf signal
1.0 V rms or greater.
generator rf input
level to 6 V.
RECEIVER SQUELCH
17
Set rf signal generator for
Set SQUELCH
rf output level of 50 RV at
switch to ON
300.000 MHz, 30% modu-
and frequency
lation at 1 kHz. Connect
switches to
600-ohm load and dis-
300.000 MHz.
tortion analyzer to
RT-980/GRC -171
AUDIO OUTPUT
(A10A2J22-N/S). Con-
nect vom to RT-980/
(Cont)
GRC-171 SQUELCH
5-9
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