6881076C20-E February 3, 2003
Performance Checks: Transmitter Performance Checks 5-7
5.5 Transmitter Performance Checks
Sensitivity
(SINAD)
As above, except SINAD, lower
the RF level for 12 dB SINAD
TEST MODE,
1 CSQ
Release PTT
switch.
RF input to be
< 0.35µV
Noise Squelch
Threshold
(only radios with
conventional
system need to
be tested)
RF level set to 1 mV RF TEST MODE,
1 CSQ
Release PTT
switch.
Set volume control to
3.16 Vrms across the
speaker
As above, except change
frequency to a conventional
system. Raise RF level from zero
until radio unsquelches.
Out of TEST
MODE;
select a
conventional
system
Release PTT
switch.
Unsquelch to occur at
< 0.25 µV
* Test frequencies are listed in Table 5-2.
Table 5-5. Transmitter Performance Checks
Test Name System Analyzer Radio
Test
Condition
Comments
Reference
Frequency
Mode: PWR MON
1st channel test frequency**
Monitor: Frequency error
Input at RF In/Out
TEST MODE,
1 CSQ
Press and hold
PTT switch.
Frequency error to be
± 70 Hz (VHF)
± 150 Hz (UHF)
± 150 Hz (800 MHz)
Power RF As above TEST MODE,
1 CSQ
Press and hold
PTT switch.
Refer to the Radio
Specifications in the
front of the manual.
Voice Modulation Mode: PWR MON
1st channel test frequency** atten
to –70,
input to RF In/Out,
Monitor: DVM, ac Volts
Set 1 kHz Mod Out level for 0.025
Vrms at test set,
80 mVrms at dummy microphone
input
TEST MODE,
1 CSQ
Press and hold
PTT switch.
Deviation:
VHF, UHF, and 800
MHz:
>= 3.6 kHz but <= 5.0
kHz
Voice Modulation
(internal)
Mode: PWR MON
1st channel test frequency** atten
to –70, input to RF In/Out
TEST MODE,
1 CSQ, output
at antenna
Remove
modulation input
from dummy
microphone.
Press and hold
PTT switch.
Press PTT switch on
microphone and say
“four” loudly into the
radio mic.
Measure deviation:
VHF, UHF, and 800
MHz:
>= 3.8 kHz but <= 5.0
kHz
Table 5-4. Receiver Performance Checks (Continued)
Test Name System Analyzer Radio Test Condition Comments
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