Motorola EX500 Basic Service Manual page 64

4-4
Test Name Communications Analyzer
Reference Mode: PWR MON
Frequency 4th channel test frequency*
Monitor: Frequency error
Input at RF In/Out
Rated Audio Mode: GEN
Output level: 1.0mV RF
4th channel test frequency*
Mod: 1kHz tone at
3kHz deviation
Monitor: DVM: AC Volts
Distortion As above, except to
distortion
Sensitivity As above, except SINAD,
(SINAD) lower the RF level for 12dB
SINAD.
Noise Squelch RF level set to 1mV RF
Threshold
(only radios
with
conventional
system need to
As above, except change
be tested)
frequency to a conventional
system. Raise RF level from
zero until radio unsquelches.
* See Table 4-4 on page 4-3.
Table 4-5 Receiver Performance Checks
TEST MODE,
Test Channel
4 carrier
squelch
output at
antenna
TEST MODE
Test Channel
4 carrier
squelch
As above
As above
As above
Out of TEST
MODE; select
a
conventional
system
Radio Test Set
PTT to
continuous
(during the
performance
check)
PTT to OFF
(center), meter
selector to
Audio PA
As above
PTT to OFF
(center)
PTT to OFF
(center), meter
selection to
Audio PA, spkr/
load to speaker
As above
Test Mode
Comments
Frequency error to
be ±200 Hz VHF
±600 Hz UHF
Set volume control
to 3.46Vrms
Distortion <5.0%
RF input to be
<0.35μ
Set volume control
to 3.46Vrms
Unsquelch to occur
at <0.35μV.
Preferred SINAD =
9-10dB