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Receiver Test:
1. In all of the following tests, the remote antenna port is connected to the rf signal generator.
2. The test box meter selector switch is set to "AUDIO PA".
3. The test box speaker selector switch is set to "A".
4. Connect the audio analyzer to the "AC/DC MTR" jack on the test box.
5. Set the power supply to 7.5 V at the radio battery terminals.
6. All of the following tests can be done on any frequency/channel.
Test Name
Rated Audio
Rx Audio
Distortion
Rx Current
at Rated Audio
Rx Sensitivity
Rx Standby
Current
Rx PL Squelch
Sensitivity
Rx DPL Squelch
Sensitivity
12
Table 4. Receiver Performance Checks in Air Test Mode
Mode
Instructions
1
Set rf generator output
level to 1000 µV (-47dBm).
Set modulation to 1kHz tone
@3kHz deviation. Set volume
control for rated audio. Set
audio analyzer to ac level.
1
Set radio to rated audio.
Set audio analyzer to
check distortion.
1
Set radio at rated audio.
1
Set radio to rated audio.
Set audio analyzer to
check SINAD. Decrease rf
output of signal generator
until 12dB SINAD is achieved.
Note: In some cases it may
be necessary to hold monitor
button depressed to unsquelch
radio.
2
Set rf signal generator
output level to <-140dBm.
Check that radio is
squelched. Measure current.
2
Set rf signal generator
level to <-140dBm.
Modulate rf signal with
192.8 Hz tone at 750 Hz
deviation. Check that
the radio is squelched.
Slowly increase rf signal
level until radio becomes
unsquelched.
4
Set rf signal generator
output level to <-140dBm.
Modulate rf signal with
DPL code 131 at 750 Hz
deviation. Check that the
radio is squelched. Slowly
Specifications
3.7V rms audio
out
5% maximum
235 mA maximum
0.35 µV maximum
(-116 dBm)
105 mA maximum
0.5 µV maximum
(-113 dBm)
0.5 µV maximum
(-113dBm)
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