QUANTUN QP650U Plus, Service Manual

Page: 51 / 67

QP-650U Plus Adjustment Description
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TX section
Item Condition Test
Instrument
Method Purpose
1. Transmit
frequency
Turn to CH5; TX Test Adjust VR200 Frequency Error
≤
100Hz
2. CDCSS balance Turn to CH5.
Adjust at 1 point (wideband),
TX TEST
HPF ： 20HZ
LPF ： 300HZ
PTT key
SFK2 key
standard waveform
3. Transmit Audio
Deviation
Turn to CH2.
Adjust at 1 point(wideband),
HPF: 20Hz
LPF: 15KHz
1KHz
120mV
PTT key
SFK2 key 4KHz (25KHz),
Manual adjustment mode
Item Condition Test
Instrument
Method Purpose
1. TX power
Low
Turn to CH2.
Adjust at 5 point (wideband).
PTT key
SK1 key 1.1W±0.2W
2. TX power
HIGH
Turn to CH3.
Adjust at 5 point (wideband),
PTT key
SK1 key 5.0W±0.2W
3. CDCSS
deviation
Turn to CH4.
Adjust at 3 point (wideband),
1 point (medium band)
1 point (narrowband)
PTT key
SK1 key
4. CTCSS
(67.0Hz)
deviation Low
Turn to CH5.
Adjust at 3 point (wideband),
1 point (medium band)
1 point (narrowband).
PTT key
SK1 key
5. CTCSS
(136.5Hz)
deviation
Center
Turn to CH6.
Adjust at 3 point (wideband),
1 point (medium band)
1 point (narrowband)
PTT key
SK1 key
6.CTCSS
(254.1Hz)
deviation High
Turn to CH7.
Adjust at 3 point (wideband),
1 point (medium band)
1 point (narrowband).
TX TEST
HPF ： 20HZ
LPF ： 300HZ
PTT key
SK1 key
750Hz (25KHz),
600Hz (20KHz)
400Hz (12.5KHz)