HYT POWER446, Service Manual

Page: 38 / 61

POWER446 Service Manual
36
TX
Frequency
Tolerance
Set to CH2 and hold
down
PTT
to transmit.
Communicat
ion Test Set
Antenna VR300
Tune VR300 with
ceramic tuning tool
to control the
center frequency
within the error
range.
≤ 150Hz
Set to CH1 and hold
down
PTT
to transmit.
Tune TC100 with
ceramic tuning tool
until the lock
voltage meets the
requirements.
1.1~1.3V
TX VCO
Lock Voltage
Set to CH3 and hold
down
PTT
to transmit.
TC100
Check ≥ 1V
Set to CH1
Tune TC101 with
ceramic tuning tool
until the lock
voltage meets the
requirements.
1.1~1.3V
RX VCO
Lock Voltage
Set to CH3
Digital
Voltmeter
CV
TC101
Check
≥ 1V
Maximum
Frequency
Deviation
Narrow
Band
Set to
CH1, CH2
and CH3
respectivel
y, and hold
down
PTT
to
transmit.
Communicat
ion Test Set
BFP:
<20Hz~15k
Hz AF:
1kHz
150mV
VR200
Tune VR200 with
ceramic tuning tool
until the frequency
deviation satisfies
the requirements.
1.8~2.1KHz
Modulation
Sensitivity
Narrow
Band
Set to
CH1, CH2
and CH3
respectivel
y, and hold
down
PTT
to
transmit.
Communicat
ion Test Set
BPF: 0.3
KHz
～
3KHz
AF:1KHz
Antenna
Earpiece
Socket
Tune audio output
signal of the
communication test
set, until the
frequency
deviation reaches
1.5KHz.
9±3mV