Motorola Expert Series - Transmitter Performance Checks

Test Mode 4-5
Table 4-6 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
PTT to
continuous
(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
output at
antenna
Remove
modulation input
Press PTT switch on
radio. Say “four” loudly
into the radio mic.
Measure deviation:
VHF, UHF:
≥ 4.0 kHz
but
≤ 5.0 kHz
(25 kHz Ch Sp)
High-Speed
Data
Modulation***
As above TEST MODE,
Test Channel 4
high speed
output at
antenna
PTT to
continuous
(during the
performance
check).
Deviation:
VHF, UHF:
≥ 2.5 kHz
but
≤ 3.5 kHz
(25 kHz Ch Sp)
DTMF
Modulation
As above,
4th channel test frequency*
TEST MODE,
Test Channel 4
DTMF output 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).
*** MDC
* See Table 4-4 on page 4-3.