RF Test Mode 3-5
Noise
Squelch
Threshold
(only radios
with conven-
tional sys-
tem need to
be tested)
RF level set to 1mV RF As above PTT to OFF
(center), meter
selection to
Audio PA, spkr/
load to speaker
Set volume control to
3.2Vrms
As above, except change fre-
quency to a conventional
system. Raise RF level from
zero until radio unsquelches.
out of TEST
MODE; select
a conven-
tional system
As above Unsquelch to occur at
<0.25µV.
Preferred SINAD =
6-9 dB
See Table 3-4
Table 3-6 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 continu-
ous (during the
performance
check)
Frequency error to be
±186 Hz VHF1
±200 Hz VHF2
±525 Hz UHF1
±568 Hz UHF2
±600 Hz UHF3
Power RF As above As above As above Refer to Mainte-
nance Specifications
Voice
Modulation
Mode: PWR MON
4th channel test frequency
*
atten to -70, input to RF In/
Out
Monitor: DVM, AC Volts
Set 1 kHz 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 modu-
lation input
Press PTT switch on
radio. Say “four”
loudly into the radio
mic. Measure devia-
tion: VHF, UHF
≥ 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
≥ 3.05 kHz
but
≤ 3.45 kHz
(25 kHz Ch Sp)
Table 3-5 Receiver Performance Checks (Continued)
Test Name Communications Analyzer Radio Test Set Comments
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