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1.3.9 Receiver Squelch Setting 

Under the computer test mode, select “the 9

th

 squelch” and 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 “the 3

rd

 squelch” and 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. 
 

1.4 Debugging 

The above debugging refers to Table3, Table4, and Table 5. 
Table 1.3 Voltage Controlled Oscillator (VCO) 

Item Test 

Condition 

Test 

Equipment  

Test Point 

Adjustment 

Part  

Requirement Note 

Setting   Battery Power

7.5V Digital 

Multimeter  PD 

 

 

 

CH

RX Low Frequency 

C180 

1.0V±0.1V 

Adjustment 

CH

RX High Frequency 

 

Lower than 
3.5V 

Watch 

CH

TX Low Frequency 

C181 

1.0V±0.1V 

Adjustment 

 
Locked 

Power 

CH

TX High Frequency 

 

 

 

Lower than 
3.5V 

Watch 

 

Table 1.4    Receiver 

 

 

 

Item 

 

Test Condition 

 

Test Equipment   

 

Test 

Point  

Adjustment Requirement 

 Note 

Band 
Pass 
Filter 

 

Spectroanalizer/ 
Comprehensive 
Test  
Device  

Before 
Mixing 

Computer 
Test Mode 

 

Not 
recommend 
the user to 
adjust it! 

Audio 
Level  

Test 
Frequency

 

MF 
Antenna Input

 

RF OUT

-53dBm(501µV) 
MOD

1kHz 

DEV

±3.0kHz 

Audio Load

16

 

 (Turn 

the 

volume knob 
clockwise) 
Audio power 

0.3 W 

Inner 
speaker 
power 

1.2W 

Sensitivity 

CH

 MF 

CH

LF 

CH

HF  

RF OUT

 

-116dBm(0.35µV) 
MOD

1kHz 

DEV

±1.5kHz 

 

Computer 
Test Mode 

SINAD

 

12dB or 
higher 

 

Squelch 
Activation 
Sensitivity 

CH

 Receiving 

Center 
Frequency 

 
RF Audio Signal 
Generator  
 
Oscillator  
 
 
Audio Voltmeter 
 
 
Distortion Test 
Device 
 
 
/Comprehensive 
Test Device   

 
 
Speaker 
Connector 

 
 

After 
adj

ustment, 

squelc

 

Содержание PT4200-01

Страница 1: ...ee measures for human body and equipments 1 1 Service Equipment and Software The following equipments and software in Table 1 1 are necessary for the service and test of the radio Table 1 1 For Test and Service Equipment and Software No Item Specifications 1 Computer Higher than P2 compatible with IBM PC WINDOWS 98 ME 2000 XP 2 Programming Software KSP 20 3 Programming Line KSPL02 4 Cloning Line K...

Страница 2: ... TXD SP Figure 1 1 External Speaker Mic Connector Definition 1 2 Debugging Items During the course of maintenance the radio needs to be tested and debugged after replacing components Some certain radio parameters can be modified computer mode with our KSP 20 programming software The modifiable parameters are as follows 1 Frequency difference 2 TX power 3 Low battery power warning threshold 4 Squel...

Страница 3: ...frequency high power high frequency to set the TX power at 4W 1 3 4 TX Low Power Warning Adjust the power to 6 8V Under the computer test mode select the low power threshold and click adjustment to enter Adjust the figure among 0 255 to make the red light flash 1 3 5 Frequency Deviation Adjustment Input 100mV 1000Hz audio signals from the radio MIC and adjust the potentiometer VR2 to set the TX fr...

Страница 4: ...V Digital Multimeter PD CH RX Low Frequency C180 1 0V 0 1V Adjustment CH RX High Frequency Lower than 3 5V Watch CH TX Low Frequency C181 1 0V 0 1V Adjustment Locked Power CH TX High Frequency Lower than 3 5V Watch Table 1 4 Receiver Item Test Condition Test Equipment Test Point Adjustment Requirement Note Band Pass Filter Spectroanalizer Comprehensive Test Device Before Mixing Computer Test Mode ...

Страница 5: ...st Device Ammeter Computer Test Mode Adjust to 4 7W Within 0 2W Maximum Modulation Frequency Deviation CH TX Center Frequency AG 1kHz 220mV VR2 Adjust to 2 2kHz 200Hz Modulation Sensitivity CH TX Center Frequency AG 1kHz 22mV Frequency Deviation Meter Comprehensive Test Device Checking frequency 1 1kHz 1 9kHz CTCSS DEV CTCSS 67Hz Frequency Deviation Meter Comprehensive Test Device Computer Test Mo...

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