Kirisun PT8000, Service Manual

                                         PT8000 Service Manual

14

On”, and select “Narrowband”. Choose a frequency point, and 

click “Begin”, the programming software will adjust the value 

automatically. When the value keeps stable, click “OK”, the 

adjustment of that frequency point is completed. Use the method 

to adjust the five frequency points of “Lowest”, “Low”, “Mid”, 

“High” and “Highest” respectively.   

g. In the “Tuning Mode” (input RF signal with the same frequency 

as the adjusted frequency point and with the signal level of 

-123dBm, audio frequency of 1kHz, and deviation of 3kHz to the 

antenna connector of the mobile radio), double click “SQL1 Off”, 

and select “Wideband”. Choose a frequency point, and click 

“Begin”, the programming software will adjust the value 

automatically. When the value keeps stable, click “OK”, the 

adjustment of that frequency point is completed. Use the method 

to adjust the five frequency points of “Lowest”, “Low”, “Mid”, 

“High” and “Highest” respectively.   

h. In the “Tuning Mode” (input RF signal with the same frequency 

as the adjusted frequency point and with the signal level of 

-123dBm, audio frequency of 1kHz, and deviation of 1.5kHz to 

the antenna connector of the mobile radio), double click “SQL1 

Off”, and select “Narrowband”. Choose a frequency point, and 

click “Begin”, the programming software will adjust the value 

automatically. When the value keeps stable, click “OK”, the 

adjustment of that frequency point is completed. Use the method 

to adjust the five frequency points of “Lowest”, “Low”, “Mid”, 

“High” and “Highest” respectively.   

7.2.12 DTMF DEV (set the HP8920 to be in the Tx status, and set 

the filter to be 50Hz ~ 15kHz) 

a. In the “Tuning Mode”, double click “DTMF DEV”, and select 

“Wideband”. Adjust the five frequency points of “Lowest”, “Low”, 

“Mid”, “High” and “Highest” respectively within the range of 

0~255 to make the deviation be 3.5kHz. 

b. In the “Tuning Mode”, double click “DTMF DEV”, and select 

“Narrowband”. Adjust the value within the range of 0~255 to 

make the deviation be 1.7kHz. 

7.3 Adjustment Description 

   Refer to Table 7.3, 7.4, and 7.5 for the above mentioned 

adjustment. 

Table 7.3 VCO 

Item 

Test Condition 

Test Equipment

Measurement 

Terminal 

Adjustment Parts Requirement 

Remark

Setting 

BATT terminal voltage: 13.8V 

DMM 

PD 

CH: Rx high freq point 

C122 

3.5V

± 0.3V 

Adjust 

CH: Rx low freq point 

﹥

0.6V Observe

CH: Tx high freq point 

C39 

3.5V

± 0.3V 

Adjust 

VCO lock 

voltage 

CH: Tx low freq point 

﹥

0.6V Observe

Table 7.4 Receiver Section 

Item 

Test Condition 

Test Equipment

Measurement 

Terminal 

Adjustment 

Parts 

Requirement 

Remark 

BPF  

Spectrum 

analyzer / 

General test set

Before mixing

Tuning 

mode 

Smooth wave 

User 

adjustment not 

recommended

Audio 
Power 

Test freq: Mid freq point 

Antenna connector input: 

RF OUT: -47dBm (1

μ

V) 

MOD: 1kHz 

DEV: ± 3.0kHz/± 1.5kHz 

Audio load: 8

Ω

Tuning 

mode 

(Turn the 

volume knob 

fully 

clockwise) 

Audio power

＞

 4W 

Sensitivity 

CH: Mid freq point 

CH: Low freq point 

CH: High freq point 

RF OUT: -119dBm 

(0.25

μ

V) 

MOD: 1kHz 

DEV:

± 3.0kHz/± 1.5kHz 

Tuning 

mode 

SINAD: 12dB 

or higher 

Squelch 

CH: Rx mid freq point 

RF signal 

generator 

Oscilloscope

Audio 

frequency 

voltmeter 

Distortion 

meter 

General test set

Speaker 

connector 

Tuning Normal 

squelch