TC-618/626 Service Manual
75
Wide
Bandwidth
Rotate the
Channel
Selector
knob
to CH1, CH2
and CH3, and
press
PTT
to
transmit.
Adjust VR200
with ceramic
tuning tool until
the frequency
deviation
meets the
requirements.
3.7~4.3KHz
Max.
Deviation
Narrow
Bandwidth
Rotate the
Channel
Selector
knob
to CH4, CH5
and CH6, and
press
PTT
to
transmit.
Communication
Test Set
BPF:
<20Hz~15kHz
AF: 1kHz
150mV
VR200
Check
1.7~2.2KHz
Wide
Bandwidth
Rotate the
Channel
Selector
knob
to CH1, CH2
and CH3, and
press
PTT
to
transmit.
Adjust the
strength of the
output audio
signal of
communication
test set to
ensure that the
deviation value
reaches
3.0KHz.
8~18mV
Modulation
Sensitivity
Narrow
Bandwidth
Rotate the
Channel
Selector
knob
to CH4, CH5
and CH6, and
press
PTT
to
transmit.
Communication
Test Set
BPF:
0.3 KHz~3KHz
AF: 1KHz
Antenna
Earpiece
Jack
Adjust the
strength of the
audio output
signal of
communication
test set to
ensure that the
deviation value
reaches
1.5KHz.
8~18mV
2)
Adjustment in the Adjustment Mode
Note: Make sure the antenna or load is connected before adjustment.
Test
Adjustment
Item
Condition
Test
Instrument
Test
point
Part
Method
Specifications
/ Remarks
Rotate the
Channel
Selector
knob to CH4
and press
PTT
to
enable this
function.
Select the
low
frequency.
Tx Power
High
Power
Short press
PTT
to switch
between
frequencies
circularly
(refer to the
TC-618/626
Adjustment
Item
table).
Communication
Test Set /
Ammeter
Antenna
Connector
SK1
SK2
Press
SK1/SK2
to
adjust the
output power,
and rotate the
Channel
Selector
knob to save
it.
4.5-5W
I
≤
1.7A
Содержание TC-618
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