TC-508 Service Manual
76
switch
to
narrow
band.
Squelch
On
Wide
Band
Set to CH10 and
SQL On 5. Press
SK1
or
SK2
key to
sample the current
value. At this time,
“wide
band” and
“low frequency”are
selected.
Short
press
PTT
to switch
among
different
frequencies
(low,
medium and high).
Communicati
on test set
SSG:
-123dBm
MOD: 1KHz
DEV: 3KHz
Filter: 0.3 -
3KHz
Antenna
connector
Accessor
y Jack
Tune the
output signals
of SSG to the
squelch level.
Rotate the
Channel
Selector
knob to save
the value after
three-point
tuning.
Squelch
level 5:
-123
±
1dBm
Narrow
Band
Long press
PTT
to
enter narrow band,
and press
SK1
or
SK2
to sample the
current value. Short
press
PTT
to switch
the frequency.
Communicati
on test set
SSG:
-121dBm
MOD: 1KHz
DEV: 1.5KHz
Filter: 0.3 -
3KHz
Sam as
above
Squelch
level 5:
-121
±
1dBm
Squelch
Off
Wide
Band
Set to CH11 and
SQL Off 5.
Press
SK1
or
SK2
to
sample the current
value. At this time,
“wide
band” and
“low frequency”are
selected.
Short
press
PTT
to switch
frequencies.
Communicati
on test set
SSG:
-126dBm
MOD: 1KHz
DEV: 3KHz
Filter: 0.3 -
3KHz
Antenna
connector
Accessor
y Jack
Tune the
output signals
of SSG to the
squelch level.
Rotate the
Channel
Selector
knob to save
the value after
three-point
tuning.
Squelch
level 5:
-125
±
1dBm
Narrow
Band
Long press
PTT
to
enter narrow band,
and press
SK1
or
SK2
to sample the
current value. Short
press
PTT
to switch
the frequency.
Communicati
on test set
SSG:
-124dBm
MOD: 1KHz
DEV: 1.5KHz
Filter: 0.3 -
3KHz
Sam as
above
Squelch
level 5:
-123
±
1dBm
RX Low
Voltage
Threshold
Set to CH12.
Digital
voltmeter
Power
Supply
Port
Power
Supply
Tune the
output voltage
to 7.0V, and
press
SKI
to
sample the
When the
value is
6.9±0.1V,
an alert
tone will be
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