Adjustment Items; Specific Operations And Requirements - HYT TC-610 Service Manual

3.

Adjustment Items

Tx
Tx frequency tolerance, VCO lock voltage, maximum deviation and modulation sensitivity
Note: These items are adjusted outside the adjustment mode (unnecessary to enter the adjustment
mode) via hardware.
Tx low power, Tx high power, CDCSS waveform, CDCSS deviation, CTCSS deviation (low), CTCSS
deviation (medium), CTCSS deviation (high) and Tx low voltage threshold.
Note: These items are adjusted inside the adjustment mode via software.
Rx
VCO lock voltage (outside the mode), squelch, Rx bandpass filter, Rx low voltage threshold.

Specific Operations and Requirements

1. Conventional Adjustment Items (outside the adjustment mode): Tx frequency tolerance, VCO lock
voltage, maximum deviation, modulation sensitivity.
Note: The configuration file has preset CH1, CH2 and CH3 as wide band with low, medium and high
frequency respectively and CH4, CH5 and CH6 as narrow band with low, medium and high frequency
respectively. Make sure the antenna or load is connected before adjustment.
TC-610/620 VHF
Item Condition
Tx Rotate to CH2.
frequency Press PTT to
tolerance transmit.
Rotate to CH3.
Press PTT to
Tx VCO
transmit.
lock
voltage
Rotate to CH1.
Press PTT to
transmit.
Rotate to CH3.
Rx VCO
lock
voltage
Rotate to CH1.
Rotate to CH1,
CH2 and CH3
respectively.
Press PTT to
W
transmit.
Max.
Deviation
Rotate to CH4,
CH5 and CH6
N respectively.
Press PTT to
transmit.
Measurement
Test
Test Point
Equipment
Radio
communication Antenna
test set
Digital
CV
voltmeter
Radio
communication
test set Antenna
BPF: Accessory
<20Hz~15kHz jack
AF: 1kHz
150mV
61
TC-610/620 Service Manual
Adjustment
Parts Method
Adjust VR300 with a
ceramic tuning toolto
VR300 limit the center
frequency to the
error range.
Adjust TC100 with a
ceramic tuning
tooluntil the lock
voltage is within the
TC100
required range.
Check
Adjust TC101 with a
ceramic tuning
tooluntil the lock
voltage is within the
TC101
required range.
Check
Adjust VR200 with a
ceramic tuning toolto
limit the deviation to
the specified range.
VR200
Check
Specifications
/Remarks
≤150Hz
2.8～2.9V
≥0.8
2.7～2.9V
≥0.8
3.8～4.5KHz
(It is
recommended
to adjust to
4.2KHz at the
maximum
deviation end.)
1.8～2.3KHz