Test Mode 4-5
* See Table 4-4 Test Frequencies
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
output at
antenna
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
SpeciÞcations
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
³ 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 ÒfourÓ
loudly into the radio
mic. Measure
deviation: VHF, UHF
³ 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 output
at antenna
As above Deviation:
VHF, UHF ³ 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 ³500Hz
but £ 1000Hz
(25 kHz Ch Sp).
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