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Table
4.
Receiver Performance Checks
in
Air Test
Mode
Receiver Test:
1.
In
all of the following
tests,
the remote antenna port is connected to the
rf
signal generator.
2.
The
test box meter selector switch is set
to
"AUDIO
PA'.
3.
The
test box speaker selector switch
is
set
to "A".
4. Connect the audio analyzer to the
"AC/DC MTR" jack
on
the test box.
5.
Set
the power supply to 7.5
V
at the radio battery terminals.
6. All of the following
tests can be done
on
any frequency/channel.
Test
Name
Mode
instructions
Specifications
Rated Audio
3.7V
rms audio
Set
rf
generator
output
level to 1000
pV
(-47dBm).
out
Set
modulation to
1kHz tone
@3kHz
deviation.
Set
volume
control for rated audio.
Set
audio
analyzer
to
ac
level.
Rx
Audio
Set
radio to rated audio.
5%
maximum
Distortion
Set
audio
analyzer
to
check
distortion.
Rx
Current
Set
radio at rated audio.
235 mA
maximum
at Rated Audio
Rx
Sensitivity
Set
radio to rated audio.
0.35
nV
maximum
Set
audio
analyzer
to
(-116 dBm)
check SINAD. Decrease
rf
output of
signal generator
until
12dB
SINAD
is
achieved.
Note:
In
some
cases
it
may
be
necessary
to hold monitor
button
depressed
to
unsquelch
radio.
Rx
Standby
Set
rf
signal generator
105 mA maximum
Current
output level to
<-140dBm.
Check
that radio is
squelched. Measure current
Rx PL
Squelch
Set
rf
signal generator
0.5
nV
maximum
Sensitivity
level
to
<-140dBm.
(-113 dBm)
Modulate
rf
signal
with
192.8 Hz tone at 750 Hz
deviation.
Check
that
the radio is squelched.
Slowly increase
rf
signal
level
until
radio
becomes
unsquelched.
Rx DPL Squelch
Set
rf
signal generator
0.5
pV
maximum
Sensitivity
output level to
<-140dBm.
(-113dBm)
Modulate
rf
signal
with
DPL
code
131
at 750 Hz
deviation.
Check
that the
radio is
squelched. Slowly
increase
rf
signal level
until
radio
becomes unsquelched
1
1
1
1
2
2
4
12
Table
4.
Receiver Performance Checks
in
Air Test
Mode
Receiver Test:
1.
In
all of the following
tests,
the remote antenna port is connected to the
rf
signal generator.
2.
The
test box meter selector switch is set
to
"AUDIO
PA'.
3.
The
test box speaker selector switch
is
set
to "A".
4. Connect the audio analyzer to the
"AC/DC MTR" jack
on
the test box.
5.
Set
the power supply to 7.5
V
at the radio battery terminals.
6. All of the following
tests can be done
on
any frequency/channel.
Test
Name
Mode
instructions
Specifications
Rated Audio
3.7V
rms audio
Set
rf
generator
output
level to 1000
pV
(-47dBm).
out
Set
modulation to
1kHz tone
@3kHz
deviation.
Set
volume
control for rated audio.
Set
audio
analyzer
to
ac
level.
Rx
Audio
Set
radio to rated audio.
5%
maximum
Distortion
Set
audio
analyzer
to
check
distortion.
Rx
Current
Set
radio at rated audio.
235 mA
maximum
at Rated Audio
Rx
Sensitivity
Set
radio to rated audio.
0.35
nV
maximum
Set
audio
analyzer
to
(-116 dBm)
check SINAD. Decrease
rf
output of
signal generator
until
12dB
SINAD
is
achieved.
Note:
In
some
cases
it
may
be
necessary
to hold monitor
button
depressed
to
unsquelch
radio.
Rx
Standby
Set
rf
signal generator
105 mA maximum
Current
output level to
<-140dBm.
Check
that radio is
squelched. Measure current
Rx PL
Squelch
Set
rf
signal generator
0.5
nV
maximum
Sensitivity
level
to
<-140dBm.
(-113 dBm)
Modulate
rf
signal
with
192.8 Hz tone at 750 Hz
deviation.
Check
that
the radio is squelched.
Slowly increase
rf
signal
level
until
radio
becomes
unsquelched.
Rx DPL Squelch
Set
rf
signal generator
0.5
pV
maximum
Sensitivity
output level to
<-140dBm.
(-113dBm)
Modulate
rf
signal
with
DPL
code
131
at 750 Hz
deviation.
Check
that the
radio is
squelched. Slowly
increase
rf
signal level
until
radio
becomes unsquelched
1
1
1
1
2
2
4
12
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