Motorola CDM Series Basic Service Manual

3-8 Transceiver Performance Testing
* See Table 3-4
Table 3-7: Receiver Performance Checks
Test Name Communications Analyzer Radio Test Set Comment
Reference
Frequency
Mode: PWR MON
4th channel test frequency*
Monitor: Frequency error
Input at RF In/Out
TEST MODE,
Test Channel 4
carrier squelch
output at
antenna
PTT to
continuous
(during the
performance
check)
Frequency error to
be ±150 Hz VHF
±150 Hz UHF
±100 Hz LowBand
Rated Audio Mode: GEN
Output level: 1.0mV RF
4th channel test frequency*
Mod: 1kHz tone at
3kHz deviation
Monitor: DVM: AC Volts
TEST MODE
Test Channel 4
carrier squelch
PTT to OFF
(center), meter
selector to
Audio PA
Set volume control
to 8.12Vrms
Distortion As above, except to distortion As above As above Distortion <5.0%
Sensitivity
(SINAD)
As above, except SINAD,
lower the RF level for 12dB
SINAD.
As above PTT to OFF
(center)
RF input to be
<0.3µV
Noise Squelch
Threshold (only
radios with
conventional
system need to
be tested)
RF level set to 1mV RF As above PTT to OFF
(center), meter
selection to
Audio PA, spkr/
load to speaker
Set volume control
to 3.16Vrms
As above, except change
frequency to a conventional
system. Raise RF level from
zero until radio unsquelches.
out of TEST
MODE; select a
conventional
system
As above Unsquelch to
occur at <0.25µV.
Preferred SINAD =
9-10dB

Motorola CDM Series Specifications

General

Brand	Motorola
Model	CDM Series
Category	Two-Way Radio
Language	English