HYT TC-610, TC-620 Service Manual
TC-610/620 Service Manual
58
Adjustment Description
ⅠDiagram of Operation Key (Take TC-610 for example)
Ⅱ Instrument
Radio Communication Test Set (HP8921) 1 set
10V/3A DC Regulated Power Supply 1 set
Digital Voltmeter 1 set
Ammeter 1 set
Ⅲ Preparation Before Adjustment
Put the board to be tested on the test clamp and turn the power on.
Note: Each test point must be in good contact with the clamp.
Ⅳ Adjustment Steps
1. Operations Before Adjustment
1）Adjustment of PCB Board
After program is downloaded onto the PCB board and EEPROM is initialized with the configuration file
(program is downloaded with the test frame and initialization can be done through the programming
software or wired clone), check relative specifications at each position. If adjustment is required, connect
the programming cable and enter the adjustment mode for PC adjustment
2) Adjustment of Radio Unit
1. Rotate to CH1. Power on the radio while holding down the PTT key and SK2 key for 2s at least.
The orange LED (red LED + green LED) lights, indicating the entry into the adjustment mode. Release
the keys to enter the corresponding Tx adjustment item (preset power) of the adjustment mode. The red
LED lights. Adjust each specification according to the operation instructions.
2. Or connect the programming cable for real time adjustment in PC mode.
TC-610/620 Service Manual
63
W
Rotate to CH6,
CH7 and CH8
respectively and
CTCSS is set to
low, medium and
high respectively.
Press PTT to
enable this
function.
Wide band
Short press PTT to
switch frequencies
on each channel.
Adjust VR601 with
a ceramic
alignment
screwdriver and
check each
frequency. Enter
the mode to adjust
finely with SK1/SK2
to limit the CTCSS
deviation to the
required range if
necessary.
500~900Hz (It
is
recommended
to adjust to
550-650Hz)
CTCSS
Deviation
N
Long press PTT
(≥1.5s) to enter
narrow band on
CH6, CH7 and CH8
and short press
PTT to switch
frequencies.
Radio
communication
test set
BPF:
<20Hz~300Hz
Antenna
VR601
SK1
SK2
Enter the mode to
adjust finely with
SK1/SK2 to limit
the CTCSS
deviation to the
required range if
necessary.
300~500Hz
TC-610/620 Service Manual
63
W
Rotate to CH6,
CH7 and CH8
respectively and
CTCSS is set to
low, medium and
high respectively.
Press PTT to
enable this
function.
Wide band
Short press PTT to
switch frequencies
on each channel.
Adjust VR601 with
a ceramic
alignment
screwdriver and
check each
frequency. Enter
the mode to adjust
finely with SK1/SK2
to limit the CTCSS
deviation to the
required range if
necessary.
500~900Hz (It
is
recommended
to adjust to
550-650Hz)
CTCSS
Deviation
N
Long press PTT
(≥1.5s) to enter
narrow band on
CH6, CH7 and CH8
and short press
PTT to switch
frequencies.
Radio
communication
test set
BPF:
<20Hz~300Hz
Antenna
VR601
SK1
SK2
Enter the mode to
adjust finely with
SK1/SK2 to limit
the CTCSS
deviation to the
required range if
necessary.
300~500Hz
TC-610/620 Service Manual
64
Rotate to
CH9.
VOX 1
Press SK1 or
SK2 to enable
the function.
Radio
communication
test set
BPF:
<20Hz~15kHz
AF:1kHz
10mV
Adjust with SK1/SK2 and
rotate the Channel
Selector knob to save
after one-point adjustment.
Rotate to
CH10.
VOX 2
Press SK1 or
SK2 to enable
the function.
Radio
communication
test set
BPF:
<20Hz~15kHz
AF:1kHz
6mV
Adjust with SK1/SK2 and
rotate the Channel
Selector knob to save
after one-point adjustment
Rotate to
CH11.
VOX 3
Press SK1 or
SK2 to enable
the function.
Radio
communication
test set
BPF: <
20Hz~15kHz
AF:1kHz
4.5mV
Adjust with SK1/SK2 and
rotate the Channel
Selector knob to save
after one-point adjustment
Rotate to
CH12
VOX 4
Press SK1 or
SK2 to enable
the function.
Radio
communication
test set
BPF: <
20Hz~15kHz
AF:1kHz
3.5mV
Adjust with SK1/SK2 and
rotate the Channel
Selector knob to save
after one-point adjustment
VOX
Rotate to
CH13.
VOX 5
Press SK1 or
SK2 to enable
the function.
Radio
communication
test set
BPF:
<20Hz~15kHz
AF:1kHz
2mV
Antenna
Accessory
jack
SK1
SK2
Adjust with SK1/SK2 and
rotate the Channel
Selector knob to save
after one-point adjustment
Tx Low
Voltage
Threshold
Digital voltmeter
Power
supply
port
Power
supply
Adjust the output voltage
of the power supply and
check the alarm level
6.2V-7.0V
(≤7.0V: LED
flashes;
≤6.2V: a
warning tone
is heard and
transmission
is suspended)
Rotate to
CH8.
Low
frequency
Rx
Sensitivity
(bandpass)
Short press
PTT to switch
to other
frequencies.
Radio
communication
test set
SSG:
-119dBm
MOD: 1KHz
DEV: 3.0KHz
Filter: 0.3～3KHz
Antenna
Accessory
jack
SK1
SK2
Check bandpass waveform
.
Adjust with SK1/SK2.
Rotate the Channel
Selector knob to save
after five-point
adjustment.
Check: Rotate
the Volume
Control knob
to an
appropriate
position to
make the
output
unlimited.
SINAD:
≥12dB
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