Transmitter Performance Tests - Motorola GP140 Basic Service Manual

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 modu-
Test Channel lation input
4 carrier
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 SpeciÞcations
Deviation:
VHF, UHF,
³ 4.0kHz but
£ 5.0kHz.
(25 kHz Ch Sp)
Press PTT switch on
radio. Say ÒfourÓ
loudly into the radio
mic. Measure devia-
tion: VHF, UHF,
³ 4.0kHz but
£ 5.0kHz
(25 kHz Ch Sp)
Deviation:
VHF, UHF,
³ 3.05kHz but
£ 3.45kHz
(25 kHz Ch Sp).
Deviation:
VHF, UHF,
³500Hz but
£ 1000Hz.
(25 kHz Ch Sp).