4-2
PERFORMANCE TESTING
3.0
Transmitter Performance Tests
The transmitter performance tests are described in Table 4-2 below.
Table 4-2
Transmitter Performance Checks
Test Name
Communications
Analyzer
Radio
Test Set
Comments
Reference
Frequency
Mode: PWR MON
Monitor: Frequency error
Input at RF In/Out
TEST MODE,
Test Channel
4 carrier
squelch
PTT to continu-
ous (during the
performance
check)
Frequency error to be
±
200Hz VHF
±
600Hz UHF
Power RF
As above
As above
As above
Refer to Mainte-
nance SpeciÞcations
Voice
Modulation
Mode: PWR MON
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,
³
4.0kHz but
£
5.0kHz.
(25 kHz Ch Sp)
Voice
Modulation
(internal)
Mode: PWR MON
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 ÒfourÓ
loudly into the radio
mic. Measure devia-
tion: VHF, UHF,
³
4.0kHz but
£
5.0kHz
(25 kHz Ch Sp)
DTMF
Modulation
As above,
TEST MODE,
Test Channel
4 DTMF out-
put at
antenna
As above
Deviation:
VHF, UHF,
³
3.05kHz but
£
3.45kHz
(25 kHz Ch Sp).
PL/DPL
Modulation
As above
BW to narrow
TEST MODE,
Test
Channel 4
TPL
DPL
As above
Deviation:
VHF, UHF,
³
500Hz but
£
1000Hz.
(25 kHz Ch Sp).