Motorola GP88s - Page 51

Test Mode 5-5
* See Table 5-4
Table 5-6 Transmitter Performance Checks
Test
Name
Communications
Analyzer
Radio Test Set Comments
Reference
Frequency
Mode: PWR MON
4th channel test frequency*
Monitor: Frequency error
Input at RF In/Out
TEST MODE,
Test Channel
4 carrier
squelch out-
put at
antenna
PTT to continu-
ous (during the
performance
check)
Frequency error to be
±200 Hz VHF
±600 Hz UHF
Power RF As above As above As above Refer to Maintenance
Specifications
Voice
Modulation
Mode: PWR MON
4th channel test frequency*
atten to -70, input to RF In/
Out
Monitor: DVM, AC Volts
Set 1kHz Mod Out level for
0.025Vrms at test set,
80mVrms at AC/DC test set
jack
As above As above, meter
selector to mic
Deviation:
VHF, UHF
≥ 4.0 kHz but ≤ 5.0
kHz (25 kHz Ch Sp).
Voice
Modulation
(internal)
Mode: PWR MON
4th channel test frequency*
atten to -70, input to RF In/
Out
TEST MODE,
Test Channel
4 carrier
squelch out-
put at
antenna
Remove modu-
lation input
Press PTT switch on
radio. Say “four”
loudly into the radio
mic. Measure devia-
tion: VHF, UHF
≥ 4.0 kHz but ≤ 5.0
kHz (25 kHz Ch Sp)
DTMF
Modulation
As above,
4th channel test frequency*
TEST MODE,
Test Channel
4 DTMF out-
put at
antenna
As above Deviation:
VHF, UHF ≥3.05 kHz
but ≤ 3.45 kHz (25
kHz Ch Sp)
PL/DPL
Modulation
As above
4th channel test frequency*
BW to narrow
TEST MODE,
Test Channel
4
TPL
DPL
As above Deviation:
VHF, UHF
≥500Hz
but ≤1000Hz (25 kHz
Ch Sp).