Motorola GP1280 Series Basic Service Manual - Page 38
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4-2
3.0
Transmitter Performance Tests
The transmitter performance tests are described in Table 4-2 below.
Test Name
Reference
Mode: PWR MON
Frequency
Monitor: Frequency error
Input at RF In/Out
Power RF
As above
Voice
Mode: PWR MON
Modulation
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
Voice
Mode: PWR MON
Modulation
atten to -70, input to RF In/
(internal)
Out
DTMF
As above,
Modulation
PL/DPL
As above
Modulation
BW to narrow
Table 4-2 Transmitter Performance Checks
Communications
Analyzer
Radio
Test Set
TEST MODE,
PTT to continu-
Test Channel
ous (during the
4 carrier
performance
squelch
check)
As above
As above
As above
As above, meter
selector to mic
TEST MODE,
Remove
Test Channel
modulation
4 carrier
input
squelch out-
put at
antenna
TEST MODE,
As above
Test Channel
4 DTMF out-
put at
antenna
TEST MODE,
As above
Test
Channel 4
TPL
DPL
PERFORMANCE TESTING
Comments
Frequency error to be
± 200Hz VHF
± 600Hz UHF
Refer to Mainte-
nance Specifications
Deviation:
VHF, UHF,
≥ 4.0kHz but
≤ 5.0kHz.
(25 kHz Ch Sp)
Press PTT switch on
radio. Say "four"
loudly into the radio
mic. Measure devia-
tion: VHF, UHF,
≥ 4.0kHz but
≤ 5.0kHz
(25 kHz Ch Sp)
Deviation:
VHF, UHF,
≥ 3.05kHz but
≤ 3.45kHz
(25 kHz Ch Sp).
Deviation:
VHF, UHF,
≥ 500Hz but
≤ 1000Hz.
(25 kHz Ch Sp).