HYT TC-618, Service Manual

Page: 75 / 110

TC-618/626 Service Manual
74
press PTT to
transmit.
Wide
Bandwidth
Rotate the
Channel
Selector knob
to CH1, CH2
and CH3, and
press PTT to
transmit.
Adjust the
output audio
signal of
communication
test set to
ensure that the
deviation value
reaches
3.0KHz.
8~15mV
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
Adjust the
output audio
signal of
communication
test set to
ensure that the
deviation value
reaches
1.5KHz.
8~15mV
TC-618/626 UHF
Test Adjustment
Item Condition
Test
Instrument
Test
point
Part Method
Specifications
/ Remarks
Tx Frequency
Tolerance
Rotate the
Channel Selector
knob to CH2 and
press PTT to
transmit.
Communication
Test Set
Antenna VR300
Adjust VR300 with
ceramic tuning tool
to control the center
frequency within
the error range.
≤ 150Hz
Rotate the
Channel Selector
knob to CH1 and
press PTT to
transmit.
Adjust TC100 with
ceramic tuning tool
until the lock
voltage meets the
requirements.
0.7V (+0.1V)
Tx VCO Lock
Voltage
Rotate the
Channel Selector
knob to CH3 and
press PTT to
transmit.
TC100
Check ≥ 2.3V
Rotate the
Channel Selector
knob to CH1.
Adjust TC101 with
ceramic tuning tool
until the lock
voltage meets the
requirements.
0.7V (+0.1V)
Rx VCO Lock
Voltage
Rotate the
Channel Selector
knob to CH3.
Digital
Voltmeter
CV
TC101
Check ≥ 2.3V