Motorola GTX 2000 Service Manual page 51

Radio Diagnostic Utilities
Performance Checks
TEST
NAME
Rated Audio
Distortion
Sensitivity
(SINAD)
Noise Squelch
Threshold
(only radios with
conventional
system need
to be tested
5-4
Table 5-5. Receiver Performance Checks
COMMUNICATION
ANALYZER
Mode: GEN
Output level: 1.0mV RF
1st Channel test frequency
Mod: 1 kHz tone at
3 kHz deviation
Monitor: DVM: AC Volts
Same as above, except for
distortion
Same as above, except SINAD,
lower the rf level for 12 dB
SINAD
RF level set to 1mV RF
As above, except change
frequency to a conventional
system. Raise RF level from
Zero until radio unsquelches.
GTX/GTX LTR/LTS 2000 Portable Radios Service Manual
RADIO
TEST MODE, PTT to OFF (center),
Channel 0
meter to Audio PA
Modulation Type 1
Same as Above Same as Above
Same as Above PTT to OFF (center)
Same as Above PTT to OFF (center),
meter selection to
Audio PA, spkr/load
to speaker
out of TEST Same as Above
MODE, select a
conventional
system
68P02945C75-A
TEST SET COMMENTS
Set volume
control to
2.84 Vrms
Distortion
<5.0%
RF input to be
<0.35 µV
Set volume
control to 2.84
Vrms
Unsquelch to
occur at <0.3
µV
Preferred
SINAD=<12 dB
June 1999