Motorola GP88s Service Manual page 50

5-4
Test
Name
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 distor-
tion
Sensitivity As above, except SINAD,
(SINAD) lower the RF level for 12dB
SINAD.
Noise RF level set to 1mV RF
Squelch
Threshold
As above, except change
frequency to a conventional
system. Raise RF level from
zero until radio unsquelches.
* See Table 5-4
Table 5-5 Receiver Performance Checks
Communications
Analyzer
Radio Test Set
TEST MODE, PTT to continu-
Test Channel ous (during the
4 carrier performance
squelch out- check)
put at
antenna
TEST MODE PTT to OFF
Test Channel (center), meter
4 carrier selector to
squelch 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 conven-
tional system
Test Mode
Comments
Frequency error to be
±200 Hz VHF
±600 Hz UHF
Set volume control to
3.16Vrms
Distortion <3.0%
RF input to be <0.35µ
Set volume control to
3.16Vrms
Unsquelch to occur at
<0.25µV.
Preferred SINAD =
9-10dB