QUANTUN QP650U Plus, Service Manual

Page: 52 / 67

QP-650U Plus Adjustment Description
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7. DTMF
deviation
Turn to CH8.
Adjust at 1 point (wideband),
1 point (medium band),
1 point (narrow band).
TX Test
HPF: 20Hz
LPF: 15KHz
PTT key
SK1 key
3.2KHz (25KHz)
2.5KHz (20KHz)
1.8KHz (12.5KHz),)
8. VOX GAIN1 Turn to CH9.
Adjust at 1 point (wideband).
PTT key
SK1 key
Modulation signal:
1KHz, 35mv
Red light flashes;
9. VOX GAIN5 Turn to CH10.
Adjust at 1 point (wideband).
TX TEST
HPF: 20HZ
LPF: 15KHZ PTT key
SK1 key
Modulation signal:
1KHz, 15mv
10 .TX voltage
Low
Turn to CH11.
Adjust at 1 point (wideband). TX TEST
PTT key
SK1 key
Adjust voltage to
6.5V, Red light
flashes
11.RX
sensitivity
Turn to CH12.
Adjust at 5 point (25KHz).
PTT key
SK1 key
Adjust level to
120dBm.
SINAD ≥ 12dB
12.Squelch
Level 1
(OPEN)
Turn to CH13.
Adjust at 5 point (25KHz),
1 point (20KHz)
1 point (12.5KHz)
PTT key
SK1 key
Set level to
-124dBm ， the
speaker mute.
13. Squelch
Level 9
(OPEN)
Turn to CH14.
Adjust at 5 point (25KHz),
1 point (20KHz)
1 point (12.5KHz)
PTT key
SK1 key
set level to
-117dBm
，
the
speaker mute.
14. Squelch
Level 1
(SQUELCH)
Turn to CH15.
Adjust at 5 point (25KHz),
1 point (20KHz)
1 point (12.5KHz)
PTT key
SK1 key
Set level to
-126dBm
，
the
speaker mute.
15 Squelch
Level 9
(SQUELCH)
Turn to CH16
Adjust at 5 point (25KHz),
1 point (20KHz)
1 point (12.5KHz)
RX TEST
HPF
：
300HZ
LPF
：
3KHZ
Save
set level to
-119dBm
，
the
speaker mute.