Kirisun PT4200 Service Manual page 14

6.3.6 DCS TX Signal Wave Shape and Frequency
Adjustment
Under the computer test mode, select
modulation and click
potentiometer VR1, and watch the demodulation signals. The wave
shape should be smooth (close to square wave) and then adjust the
figure to set the frequency deviation at 0.35kHz.
6.3.7 CTCSS Frequency Deviation Adjustment
Under the computer test mode, select
modulation , and click adjustment
set the frequency deviation at 0.35kHz.
6.3.8 Receiver Sensitivity
Repeat adjusting L9, L10, L6, and L5 to make the frequencies
at highest sensitivity.
6.3.9 Receiver Squelch Setting
Under the computer test mode, select
click adjustment to enter. Input the receiver with the signals of
1kHz modulation frequency, 3kHz frequency deviation, and -
117dBm level. Adjust the figure to make the green light flash.
Under the computer test mode, select
click adjustment to enter. Input the receiver with the signals of
1kHz modulation frequency, 3kHz frequency deviation, and 124dBm
level. Adjust the figure to make the green light flash.
6.4 Debugging
The above debugging refers to Table3, Table4, and Table 5.
Table 6.3 Voltage Controlled Oscillator (VCO)
Item
Test Test
Equipment
Condition
Setting Battery Digital
Multimeter
Power:
7.5V
Locked CH:RX Low
Frequency
Power
CH:RX High
Frequency
CH:TX Low
Frequency
CH:TX High
Frequency
Table 6.4 Receiver
Item Test Test
Condition Equipment
Spectroan-
Band
alizer/
Pass
Compreh
Filter
-ensive
Test
Device
Ch: RX
RF Audio
Audio
center
Signal
frequency
Generator
RF OUT
Oscillator
Level
-53dBm
Audio
(501 V)
Voltmeter
Distortion
MOD:1kHz
DEV: 3.0 Test Device
(kHz)
/Comprehe
Audio
nsive Test
Load:16
Device
DCS wide band
adjustment to enter Adjust the
CTCSS wide band
to enter. Adjust the figure to
the 9th squelch
the 1st squelch
Test Adjustment Require
-ment
Point Part
PD
C180 1.0V 0.1V
Lower
than 3.5V
C181 1.0V 0.1V
Lower
than 3.5V
Test Adjustment Require
-ment
Point Part
Before ModePass
Computer
Band
Mixing
25MHz,
Test
smooth
wave
Shape
Speak (Turn the
er volume
knob
Conne clockwise)
ctor Audio
power
0.3 W
Item Test
Condition
Sensit CH: MF
CH:LF
ivity
CH: HF
RF OUT:
-116dBm
(0.35 V)
MOD:1kHz
DEV:
1.5kHz
(W/N)
Squel Ch: RX
ch Center
and
Activa Frequency
tion
Sensit
9th
ivity
RF OUT:
and
-117dBm
1st
RF OUT:
-124dBm
Note
Table 6.5 Transmitter
Item Test
Adjust
-ment
Condition
TX
Watch
Frequ
ency
Adjust
-ment
DCS
Wave
Shape
Watch
(Balan
ce)
Power
Note
Not
recom-
mend
Maxim
CH: TX
the user
um
Center
to adjust
Modul
it!
Frequency
ation
AG:1kHz/
Inner
Frequ
70mV
speake
ency
r power
Deviati
1.2W
on
Modul AG:1kHz/
ation
7mV
Sensiti
vity
PT4200 SERVICE MANUAL
Test Test Adjustment
Equipment Point Part
RF Audio
Speak
Computer
Signal
er
Test Mode
Generator
Oscillator
Conne
ctor
Audio
Voltmeter
Distortion
Test
Device
/Comprehe
nsive Test
Device
Computer
Test Mode
Test Test Adjustment
Equipment Point Part
Frequency Anten Computer
Meter/
na Test Mode
Comprehe
nsive Test
Device
Oscillator /
Vr1
Comprehe
nsive Test
Device
Power Computer
Meter/
Test Mode
Comprehe
nsive Test
Device/
Ammeter
Frequency
Deviation
Meter/
Comprehe
nsive Test
Device
Require Note
-ment
SINAD
12dB or
higher
Computer
Test Mode
After
adjustmen
t, squelch
activation
is normal.
After
adjustment,
squelch
activation
is normal.
Require Note
-ment
Within
±
200Hz
Wave
shape is
close to
smooth
square
wave.
Adjust to Within
4W ±
200H
z
Adjust to
±
200
±
4.5kHz
Hz
Checking
frequency
deviation:
2.2kHz~
3.6kHz
12