Motorola GM140 Grundlegendes Servicehandbuch - Seite 40
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4-6
Test Name
Reference
Frequency
Rated Audio
Distortion
Sensitivity
(SINAD)
Noise Squelch
Threshold
(only radios
with
conventional
system need
to be tested)
* See Table 4-4
Table 4-6 Receiver Performance Checks
Communications
Analyzer
Mode: PWR MON
4th channel test frequency*
Monitor: Frequency error
Input at RF In/Out
Mode: GEN
Output level: 1.0mV RF
4th channel test frequency*
Mod: 1kHz tone at
3kHz deviation
Monitor: DVM: AC Volts
As above, except to
distortion
As above, except SINAD,
lower the RF level for 12dB
SINAD.
RF level set to 1mV RF
As above, except change
frequency to a conventional
system. Raise RF level from
zero until radio unsquelches.
TRANSCEIVER PERFORMANCE TESTING
Radio
Test Set
TEST MODE,
PTT to
Test Channel 4
continuous
carrier squelch
(during the
output at
performance
antenna
check)
TEST MODE
PTT to OFF
Test Channel 4
(center), meter
carrier squelch
selector to
Audio PA
As above
As above
As above
PTT to OFF
(center)
As above
PTT to OFF
(center), meter
selection to
Audio PA,
spkr/ load to
speaker
out of TEST
As above
MODE; select
a conventional
system
Comment
Frequency
error to be
±150 Hz VHF
±150 Hz UHF
±150 Hz LB
Set volume
control to
8.12Vrms
Distortion
<5.0%
RF input to be
<0.3µV
Set volume
control to
3.16Vrms
Unsquelch to
occur at
<0.25µV.
Preferred
SINAD =
9-10dB