HYT TC-618, Service Manual

Page: 79 / 110

TC-618/626 Service Manual
78
Rotate the
Channel
Selector knob to
CH12 and select
VOX Level 4.
Press SK1 or
SK2 to enable
this function.
Communication
Test Set
BPF:
<20Hz~15kHz
AF: 1kHz
3.5mV
Apply SK1 or
SK2 to
perform
adjustment,
and rotate the
Channel
Selector
knob to save
it after
one-point
adjustment.
VOX
Rotate the
Channel
Selector knob to
CH13 and select
VOX Level 5.
Press SK1 or
SK2 to enable
this function.
Communication
Test Set
BPF:
<20Hz~15kHz
AF: 1kHz
2mV
Antenna
Earpiece
Jack
SK1
SK2
Apply SK1 or
SK2 to
perform
adjustment,
and rotate the
Channel
Selector
knob to save
it after
one-point
adjustment.
TX Low Voltage
Threshold
Digital
Voltmeter
Power
Supply
Port
Power
Supply
Adjust the
output
voltage and
check the
emergency
level.
6.2V-7.0V
(when
≤ 7.0V,
the LED
flashes; and
when
≤ 6.2V,
the alert tone
sounds to
indicate
transmission
inhibition.)
Rotate the
Channel
Selector knob to
CH8 and select
the low
frequency.
RX Sensitivity
(Bandpass)
Short press PTT
to switch
between
frequencies.
Communication
Test Set
SSG: -119dBm
MOD: 1KHz
DEV: 3.0KHz
Filter:
0.3~3KHz
Antenna
Earpiece
Jack
SK1
SK2
Check the
bandpass
waveform.
Apply SK1 or
SK2 to
perform
adjustment,
and rotate the
Channel
Selector
knob to save
it after
five-point
adjustment.
Rotate the
Volume Control
knob to a
proper level
until the output
amplitude is not
limited.
SINAD: ≥ 12dB
Squelch
On
Wide
Bandwidth
Rotate the
Channel
Selector
knob to
CH1, and set to
SQL On 1.
Press SK1 or
SK2 to enable
this function,
and select the
wide bandwidth
and low
frequency. Short
press PTT to
switch between
frequencies.
Communication
Test Set
SSG: -122dBm
MOD: 1KHz
DEV: 3KHz
Filter:
0.3~3KHz
Antenna
Earpiece
Jack
SK1
SK2
Adjust the
SSG output
signal to
squelch level.
Rotate the
Channel
Selector
Knob to save
the value
after
five-point
adjustment.
Squelch
level(1):
-122±1dB