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Page Title:
Table 5-3. Radio Receiver-Transmitter RT-980/GRC-171 Performance Tests (Sheet 6 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 6 of 17)
CONTROL SETTINGS
OPERATION OF TEST
AND OPERATION
PERFORMANCE
STEP
EQUIPMENT
POINT OF TEST
OF EQIPMENT
STANDARD
RECEIVER NARROW-BAND AUDIO RESPONSE (Cont)
28
Set rf signal generator for
Observe and com-
the following modulation
pare audio output
signals:
level for each
modulation fre-
a. 100 Hz
quency with ref-
a. Not less than 10 dB
erence level
below reference.
determined in
b. 300 Hz.
step 27.
b. Reference +1.0,
-2.0 dB.
c. 3000 Hz.
c. Reference +1.0,
-2.0 dB.
d. 10.000 Hz.
d. Not less than 10 dB
below reference.
RECEIVER WIDE-BAND AUDIO RESPONSE
29
Connect equipment as
DATA OUTPUT
Set REMOTE/LOCAL
shown in figure 5-2 and
(A10A2J22-L/M)
switch to LOCAL,
connect 10-kΩ load and
PTT/CARRIER TEST
distortion analyzer to
to PTT, SQUELCH
RT-980/GRC-171 DATA
switch to OFF, and
OUTPUT (A10A2J22-
frequency switches
L/M). Set rf signal
to 300.000 MHz.
generator for rf input
level of 500 V at
300.000 MHz, 30%
modulation at 16 Hz
to 25 kHz.
NOTE
Before proceeding, inspect receiver rf module A3 to determine the bandpass of filter
A3FL1. After determining filter A3FL1 bandpass, proceed with step 30 and applicable
parts of step 31.
30
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 31.
5-12
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