HYT TC-618, Service Manual

Page: 77 / 110

TC-618/626 Service Manual
76
Rotate the
Channel
Selector knob to
CH2 and press
PTT to enable
this function.
Select the low
frequency.
Tx Power Low 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.
2W±0.3W
I ≤ 1.2A
Rotate the
Channel
Selector knob to
CH5 and press
PTT to enable
this function.
Select the wide
bandwidth and
low frequency.
Adjust VR260
with ceramic
tuning tool
and make the
waveform
similar to
square
waveform.
CDCSS Waveform
Short press PTT
to switch
between
frequencies
circularly; and
long press PTT
to switch
between wide
bandwidth and
narrow
bandwidth.
VR260
Check
Rotate the
Channel
Selector knob to
CH5 and press
PTT to enable
this function.
Select the wide
bandwidth and
low frequency.
Wide
Bandwidth
Press PTT to
switch between
frequencies
(medium-low,
medium,
medium-high
and high).
Adjust VR601
with ceramic
tuning tool to
check each
frequency.
Apply SK1 or
SK2 to
perform fine
tuning until
the CDCSS
deviation
meets the
requirements.
500~900Hz
(550-650Hz is
recommended)
Long press PTT
to enter the
narrow
bandwidth and
select low
frequency.
CDCSS
Deviation
Narrow
Bandwidth
Press PTT to
switch between
frequencies
(medium-low,
medium,
medium-high
and high).
Communication
Test Set BPF:
<20Hz~300Hz
Antenna
VR601
SK1
SK2
Apply SK1 or
SK2 to
perform fine
tuning until
the CDCSS
deviation
meets the
requirements.
300~500Hz