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TEKK XT-600 PLUS (4) User Manual

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Type: User Manual
Category: Two-Way Radio
Pages: 22
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1

XT-600PLUS(4) 

 

Transceiver 

User manual

 

 

 

 

 

 

 

 

 

 

 

 


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2

Wisetone science & technology Co., Ltd

 

General 

 

This manual is intended for use by experienced technicians familiar with similar 

types of commercial grade communications equipment. It contains main required service 
information and data for the equipment.   

The following precautions are recommended for personal safety:   

1

DO NOT transmit until all RF connectors are verified secure and any open connectors 

are properly terminated.   
2

SHUT OFF and DO NOT operate this equipment near electrical blasting caps or in an 

explosive atmosphere.   
3

This equipment should be maintained by qualified technicians only.   

 
 
 
 
 
 
 
 
 
 
 
 
 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 


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3

CONTENTS 

 

General 
Parts Description 
Specification of software 
Circuit Description 
CPU pins Description 
Parts list 1 
Adjust Description and specifications 
Disassembly for Repair 
Component plans 
Parts list 2 
Packing list 
FCB Component locations 
Principle View 
Principle diagram 

 
 
 
Transceiver model and specification 
 

MODEL FREQUENCY(MHz) 

POWER

BATTERY 

CHARGER 

XT-600PLUS(4) 430~470MHz 

4W  XBP-1250 

DC-791 fast charger 

 

 
 

 


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4

Parts Description

 

 

1

Antenna 

The helical antenna is threaded plugs for the reception and transmission signal. 

2

LED light 

Lights red while transmitting, green while receiving a signal. Flashes red when the battery 
voltage is low while transmitting. 

3

Channel selector knob 

4

Power switch/Volume control Turn the knob clockwise to switch the transceiver ON, 

anti-clockwise to turn off the power till there is a ”click” sound , rotate to adjust the volume 
level. 

5

PTT switch(push to talk) 

Press the button while transmitting, and release it while receiving. 

6

Monitor key 

Press it to shut off squelch, noise could be heard, release to connect squelch.

 

7

Microphone 

Put in voice. 

8

Speaker 

Put out voice. 

9

Speaker jack 

Put down the cover, when you program you can put in the program line in it. 

10

Battery

 

11

Charger plate

 

  Put the battery into the charger, it will operate when the charger plates touch the metal plates.

 

12

Battery deduction

 

It use to close the battery, pull it up you can take out the battery. 

 
 

 

 


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5

Specification of the software function 
 

1

 

Turn the volume button can choice 15+1(scan) channels. 

2

 

Moni function. 

3

 

CTCSS/CDCSS program 

4

 

CTCSS: 50 groups 

5

 

CDCSS: 210 groups 

6

 

25KHz channel spacing 

7

 

Scan function, set scan channel. 

8

 

Power save. 

9

 

Time- out timer. 

10

Voice number notice, program by Chinese/English. 

11

VOX function and 9 levels can be choice.   

12

9 levels squelch control. 

13

Battery low-volt alarm. 

14

Set ANI ID code number by program. 

15

Remove the squelch tail function. 

16

PC model. 

17

Manual adjustment model. 

18

Clone function 

Model description 
1

User mode

 

Standard model (look for the XT-600PLUS(4) instruction manual) 

2

PC mode 

Set and adjust the follow function numbers with PC software or programmer. 

1

) 

Channel RX and TX power. 

2

) 

Channel RX and TX tone. 

3

) 

BCL (busy channel lock) 

4

) 

TOT (TX time-out-timer) 

5

) 

Squelch level choice. 

6

) 

Power save function choice. 

7

) 

Voice alarm function choice. 

8

) 

Moni model choice. 

9

Scan channel choice. 

10

VOX level set. 

11

Chinese/English number notice choice. 

12

ANI ID number set. 

3.

 

manual adjustment mode

 

High or low power by manual adjustment 

1

make

 sure the channel and then close the transceiver. 

2

pr

ess the PTT+MONI button to open the transceiver, it will be TX power adjustment 

model, the transceiver turn to the TX model. 

3

) 

loose the PTT+MONI button. 

4

pre

ss the PTT button one time, the power will increase, press the MONI button one 

time, the power will reduce. 

5

) 

After you finish the adjustment please close the transceiver immediately, then if you 

open the transceiver again it will operate with the power which you have adjusted. 

 

 

 


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6

4 Clone function

 

1

Use the clone line connect clone radio with be-cloned radio. 

2

Turn 

on the power of the be-cloned radio. 

3

Cho

se the 16 channel. 

4

Pus

h the MONI button after turn off the power of clone radio, then turn on the power; it 

will come into clone model. 

5

) 

If the clone is successful the Green LED will light, or the Orange LED will light. 

Circuit Description

 

一、 

Frequency configuration

 

The receiver utilizes double conversion. The first IF is 38.85MHz and the second IF is 
450KHZ. The first local oscillator signal is supplied from the PLL circuit. The PLL circuit in 
the transmitter generates the necessary frequencies. Fig.1 shows the frequencies.   

 

XT-600PLUS(4) Frequency range

 430 MHz—470MHz 

 

ANTSW

RF AMP

TX AMP

TX DRIVER

RX

TX

IF AMP

C F  4 50 K Hz

IF SYSTEM

38.4MHz

AF AMP

12.8MHz

PLL
VCO

MIC AMP

 

Fig.1

 

Frequency configuration

 

 

二、 

Receiver

 

The receiver utilizes double conversion.

 

 

1. 

Front-end RF amplifier

 

An incoming signal from the antenna is applied to an RF amplifier after passing through a 
transmit/receive switch circuit and a band pass filter. After the signal is amplified, the signal 
is filtered through a band pass filter to eliminate unwanted signals before it is passed to the 
first mixer.   

 

 


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7

ANT SW

D211

BPF

RF AMP

T221

BPF

MIXER

T241

MCF

FL251 FL253

IF AMP

T251

FL277

IF MIX

U261

38.4MHz

1ST LOCAL OSC

PLL

AF AMP

LPF HPF

AF AMP

SP

U811

U411

 

Fig.

 2 

Receiver section configuration

 

2. 

First Mixer

 

The signal from the RF amplifier is heterodyned with the first local oscillator signal from the 
PLL frequency synthesizer circuit at the first mixer 

T241

  to create a 38.85 MHz first 

intermediate frequency (1st IF) signal. The first IF signal is then fed through two monolithic 
crystal filters 

FL251,FL253

  to further remove spurious signals. 

 

 

3.     

IF amplifier

             

The first IF signal is amplified by 

T251

, and then enters 

U261

 (FM processing IC). The 

signal is heterodyned again with a second local oscillator signal within 

U261

 to create a 

450kHz second IF signal. The second IF signal is then fed through a 450kHz ceramic filter 
(

FL277

) to further eliminate unwanted signals before it is amplified and FM detected in 

U261

.  

 

 

4. 

AF amplifier

 

The recovered AF signal obtained from 

U261

, and de-emphasized by 

R264

 and 

C264

. The AF signal is then passed through U811 is amplified and low-pass filter and          

high-pass filter. The processed AF signal passes through an AF volume control and is 
amplified to a sufficient level to drive a loud speaker by an AF power amplifier (U411). 

 

 

 

5. 

Squelch

 

Part of the AF signal from the 

U261

 is go into the U261 again, and the noise 

component is amplified and rectified by a filter and an amplifier to produce a DC voltage 
corresponding to the noise level.   

The DC signal from the 

U261

 goes to the analog port of the microprocessor (

U811

).  

U811 determines whether to output sounds from the speaker, 

U811 

sends a high 

signal to the MUTE and AFCO lines and turns 

U411

 on through 

T490

. (See Fig.3) 

 

 


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8

U261

U811

U411

T498

T490

9

8

14

14

25

22

30

8

2

5

I F  A MP

D ET

H PF   AM P

D ET

H PF

B US Y

H PF   AM P

MUTE SW

F AMP

SW

SP

 

Fig.

3.  

AF Amplifier and squelch

 

6. 

Receiving signaling

 

CTCSS/CDCSS 

300 Hz and

 

audio frequencies of the output signal from IF IC are cut by a low-pass 

filter. The resulting signal enters the microprocessor (

U811

). 

U811

 determines whether the 

CTCSS

 or 

CDCSS

 matches the preset value, and controls the MUTE SW and the speaker 

output sounds according to the squelch results. 

 


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9

三、

PLL frequency synthesizer

 

The PLL circuit generates the first local oscillator signal for reception and the RF signal for 
transmission. 
 

1. 

PLL

 

The frequency step of the PLL circuit is 5 or 6.25KHz. A 12.8MHz reference oscillator 
signal is divided at 

U311

 by a fixed counter to produce the 5 or 6.25KHz reference 

frequency. The voltage controlled oscillator (VCO) output signal is buffer amplified by 

T311

then divided in 

U311

 by a dual-module programmable counter. The divided signal is 

compared in phase with the 5 or 6.25KHz reference signal in the phase comparator in

 U311

The output signal from the phase comparator is filtered through a low-pass filter and 
passed to the VCO to control the oscillator frequency. (See Fig. 4)   
 

CR311
12.8MHz

PLL IC

U311

PLL DATA

I/N

5KHz/6.25KHz

PHASE

COMPARTOR

CHARGE

PUMP

I/M

5KHz/6.25KHz

LPF

D322

D332

TX VCO

RX VCO

BUFF AMP

T/R SW

T321

T331

T311

T304 T305

 

Fig. 4 PLL

 

2. 

VCO

 

The operating frequency is generated by 

T321

 in transmit mode and 

T331

 in receive 

mode. The oscillator frequency is controlled by applying the VCO control voltage, obtained 
from the phase comparator, to the varactor diodes (

D322

 in transmit mode and 

D332

 in 

receive mode) . The T/R pin is set high in receive mode causing 

T304

 and 

T305

 to turn 

T321

off, and turn 

T331

 on. The T/R pin is set low in transmit mode.

 

The outputs from 

T321

 

and 

T331 

are amplified by 

T311

, then sent to the PLL circuit U311 and receiver or 

transmitter.  

四、

Transmitter

 

3. 

Transmit audio

 

The modulation signal from the microphone is amplified by 

U421

, passes through a 

preemphasis circuit, and the signal then passes through a low-pass filter (splatter filter) 
(

T430

 and 

T433

) and cuts up 3kHz and higher frequencies. The resulting signal goes to the 

VCO for direct FM modulation. (See Fig. 5)   
 

4. CTCSS/CDCSS

 encoder

 

A necessary signal for 

CTCSS/CDCSS

 encoding is generated by 

U811

 and FM-modulated to 

the PLL reference signal. Since the reference OSC does not modulate the loop 
characteristic frequency or higher, modulation is performed at the VCO side by adjusting 
the balance. (See Fig. 5)   

 


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10

MIC

T417

SW

U421

MIC AMP

T430,T433

BPF

VCO

D321,D322

U811

CPU

MUTE

31

44

7

1

20

DQT

DTMF

APC

SW

D141

T140

TX AMP

T130

TX DRIVER

T120

TX AMP

APC

U161

SW

D111,D112

LPF

5T

 

Fig. 5

Transmit audio 

CTCSS 

 

5. 

RF amplifier

 

The transmit signal obtained from the VCO buffer amplifier 

T311

, is amplified by 

T140

. This 

amplified signal is passed to the power amplifier 

T130

 and

 T120

, which consists of a 2 

stage FET amplifier and is capable of producing up to 4W of RF power 

6. 

ANT switch and LPF

 

The RF amplifier output signal is passed through a low-pass filter network and a transmit/receive 

switching circuit before it is passed to the antenna terminal. The transmit/receive switching circuit is 
comprised of D111 and D112. D111 and D112 turned on (conductive) in transmit mode and off (isolated) 
in receive mode. 

 

五、

Power supply

 

A 5V reference power supply for the control circuit is derived from an internal battery. This power is 

used to provide a 5V supply in transmit mode [5T], a 5V supply in receive mode [5R] , and a 5V, supply 
common in both modes based on the control signal sent from the microprocessor. 
 

 

六、

Control system

 

The IC U811CPU operates at 32.768kHZ.

 

 


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11

CPU pins Description 

PIN No. 

PIN NAME 

I/O 

DESCRIPTION 

1 PC0 

I/O 

RS-232C 

output 

2 PC1 

I/O 

Input 

encode 

3 PC2 

I/O 

Input 

encode 

4 PC3 

I/O 

Input 

encode 

5 PC4 

I/O 

Input 

encode 

PC5 

Red light control 

PC6 

Green light control 

8 PC7 

TX 

Power 

control 

PB3 

VCO Power control 

10 PB4 O 

RX 

Power 

control 

11 PB5 I 

MONI 

Button 

12 

AVdd 

CPU input power 5V 

13 

RXO 

Input QT/DQT signal 

14 RXI I 

AF 

amplifier 

15 TXI  

NC 

16 TXO  

NC 

17 TONE O 

DTMF 

output 

18 LC  

Capacitance 

input 

19 AVSS  

Grounding 

20 D/A O 

APC/AFC 

21 ATX O 

RS-232C 

output 

22 ARX O 

Audio 

output 

23 

AD1 

Detect battery voltage 

24 AD2 I 

VOX 

check 

25 

AD3 

Input busy signal 

26 OSCI I 

Oscillator 

27 OSCO O 

Oscillator 

28 Vss  

Connect 

VSS 

29 

PD1 

Audio IC control 

30 PD2 O 

Squelch 

control 

31 

PD3 

MIC mute control 

32 RESET I 

Reset 

33 

Vdd 

CPU input power 5V 

34 

PA0 

I/O 

EEPROM data cable 

35 

PA1 

I/O 

EEPROM clock cable 

36 PA2 

I/O 

EEPROM 

enable 

37 

PA3 

I/O 

PLL data output 

38 

PA4 

I/O 

PLL clock output 

39 PA5 

I/O 

PLL 

LE 

40 

PA6 

I/O 

Lock circuit detector 

41 PA7 

I/O 

RS-232C 

input 

42 PB0 I 

PTT 

Button 

43 

PB1 

Wide or narrow control 

44 PB2 O 

Output 

QT/DQT 

 

 


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12

XT-600PLUS(4) Parts list 

Material 

code

 

Size Description

 

Preci

sion 

QUA

 Ref.No

 

 Ref.No

 

R5-F0R1-00 

2512 

0.1R/1W 

R121 

   

R2-J000-00 

0402 

0R 

14

R886.R835.R456.R410.R436 

R264.R566 

R376,R370,R101,R103,R135 
R267,R364 

R2-J2R2-00 

0402 

2.2R 

   

R473 

R2-J100-00 

0402 

10R 

R440 

 

R2-J220-00 

0402 

22R 

   

R142 

R2-J330-00 

0402 

33R 

   

R313 

R2-J470-00 

0402 

47R 

   

R361,R305,R132,R131 

R2-J680-00 

0402 

68R 

   

R245 

R2-J101-00 

0402 

100R 

11

R564.R554.R439.R804 

R584,R311,R304,R257,R136

R244,R221 

R2-J151-00 

0402 

150R 

R822.R821 

R360 

R2-J181-00 

0402 

180R 

   

R380,R331,R321,R314,R312

R2-J221-00 

0402 

220R 

   

R256,R246,R113 

R2-J561-00 

0402 

560R 

   

R365 

R2-J681-00 

0402 

680R 

R515 

R253,R273 

R2-J102-00 

0402 

1K 

10

R838.R824.R823.R455.R458 

R482,R478,R373,R366,R362

R2-J102-00 

0402 

1.2K 

R414 

   

R2-J182-00 

0402 

1.8K 

.R437.R425 

R581 

R2-J222-00 

0402 

2.2K 

   

R368 

R2-J272-00 

0402 

2.7K 

   

R316,R146,R133,R262 

R2-J332-00 

0402 

3.3K 

R438.R434 

R255,R272,R263,R582 

R2-J392-00 

0402 

3.9K 

   

   

R2-J472-00 

0402 

4.7K 

14

R516.R873.R872.R426.R871 
R371,R595,R594,R593,R591 

R363,R243,R242,R367 

R2-J512-00 

0402 

5.1K 

R417 

   

   

0402 

5.6K 

R562 

   

R2-J682-00 

0402 

6.8K 

   

R147 

R2-J822-00 

0402 

8.2K 

R556, 

R143 

R2-J103-00 

0402 

10K 

17

R452,R151,R153,R430,R433 

R511 

R296,R481,R335,R333,R322
R315,R307,R306,R148.R249

R291 

R2-J153-00 

0402 

15K 

R885 

R241 

R2-J183-00 

0402 

18K 

R552.R412.R159 

   

R2-J203-00 

0402 

20K 

R563.R553.R442 

   

R2-J223-00 

0402 

22K 

R833.R494.R419.R857 

R385,R383 

R2-J333-00 

0402 

33K 

R441.R432.R431.R429,R427 

R158. 

R379,R378 

R2-J393-00 

0402 

39K 

R862.R157 

   

R2-J473-00 

0402 

47K 

R808.R806.R803.R802.R801 

R372.R154,R592 

R110 

R2-J513-00 

0402 

51K 

   

   

R2-J563-00 

0402 

56K 

R852 

R218 

R2-F683-00 

0402 

68K 

R855 

   

R2-J823-00 

0402 

82K 

R884.R854 

   

R2-F104-00 

0402 

100K 

13

R883.R493.R444.R231.R411 

R325,R323,R215,R227,R224

R216,R392,R391 

R2-J124-00 

0402 

120K 

R567.R551 

   

R2-J154-00 

0402 

150K 

10

R832.R831.R167.R166.R165 

R164.R163.R161 

R369,R254 

 


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13

R2-J224-00 

0402 

220K 

R561.R155 

   

R2-J274-00 

0402 

270K 

   

R268 

R2-J334-00 

0402 

330K 

R512.R445 

   

R2-J474-00 

0402 

470K 

R491.R413.R421 

R271 

R2-J105-00 

0402 

1M 

R152 

   

R2-J185-00 

0402 

1M8 

R428.R404 

   

R2-J475-00 

0402 

4.7M 

R492 

R475 

   

   

   

   

 

   

   

RP-0473-00  RP-1206-4 

47K 

   

PR804.PR801 

   

RP-0472-00  RP-1206-4 

4.7K 

   

PR805 

   

RP-0102-00  RP-1206-4 

1K 

   

   

PR802 

   

   

   

   

 

   

   

RT-0103-00 

RV1208 

10K 

   

RV422 

   

RT-0503-00 

RV1208 

50K 

   

RV266.RV361 

   

C2-B0R5-00 

0402 

0.5P 

   

C326,C325 

C2-B010-00 

0402 

1P 

   

   

C2-B1R5-00 

0402 

1.5P 

   

C252 

C2-B020-00 

0402 

2P 

   

C363,C311,C116 

C2-B030-00 

0402 

3P 

   

C134,C249,C247,C323,C226

C3-B090-00 

0603 

3P 

   

C126 

C2-B040-00 

0402 

4P 

   

   

C2-B050-00 

0402 

5P 

   

C322 

C2-B060-00 

0402 

6P 

   

C332,C333,C315,C243,C236

C214,C117 

C3-B070-00 

0603 

7P 

   

C125,C713 

C2-B070-00 

0402 

7P 

C253 

C143,C228,C383 

C2-B080-00 

0402 

8P 

   

C312 

C2-B090-00 

0402 

9P 

   

C146,C115,C225,C223 

C3-B070-00 

0603 

9P 

   

C128 

C2-B100-00 

0402 

10P 

   

C321,C112 

C2-B120-00 

0402 

12P 

   

C224,C215,C324,C136 

C2-B130-00 

0402 

13P 

   

C216 

C2-B150-00 

0402 

15P 

   

C227,C331,C328,C334 

C2-B180-00 

0402 

18P 

   

C218 

C2-B220-00 

0402 

22P 

   

C211.245 

C3-B220-00 

0603 

22P 

   

C111 

C2-B240-00 

0402 

24P 

   

C212 

C3-B240-00 

0603 

24P 

   

   

C2-B270-00 

0402 

27P 

C882.C811.C596.C597 

C213 

C2-B330-00 

0402 

33P 

   

C144,C251,C237,C235,C291

C2-B390-00 

0402 

39P 

   

   

C2-B470-00 

0402 

47P 

C492 

C133 

C2-B560-00 

0402 

56P 

   

C292 

C2-B820-01 

0402 

82P 

   

C262,C135 

C2-J101-00 

0402 

100P 

C161 

C362,C368,C367,C366 

   

0402 

120P 

   

C387 

C2-J221-00 

0402 

220P 

C838.C471.C454.C852.C458 

C472 

C2-J331-00 

0402 

330P 

   

C271,C268 

C2-J471-00 

0402 

470P 

20

C823.C661.C554.C447.C436 

C403.C152.C164 

C583,C364,C360,C335,C307
C306,C304,C142,C113,C451

C392,C906 

C3-J471-00 

0603 

470P 

   

C122 

C2-J681-00 

0402 

680P 

C429 

   

C2-J681-00 

0402 

820P 

C433 

   

C2-k102-00 

0402 

102P 

13

C151,C162,C430,C432,C365 

C377,C372,C370,C361,C118

C371,C293,C132 

C2-k222-00 

0402 

222P 

   

C266,C265 

 


background image

 

14

C2-k392-00 

0402 

392P 

C856 

   

C2-J472-00 

0402 

472P 

C264,C595,C591,C412,C871 

   

C2-k103-00 

0402 

103P 

29

C513.C885.C854.C435.C388 

C163.C153.C105.C402 

C202,C201,C102,C101,C301
C141,C148,C256,C255,C254
C246,C241,C231,C234,C233
C232,C221,C277,C907,C905

C2-k223-00 

0402 

223P 

C389.C426,C431 

   

C2-k273-00 

0402 

273P 

C414.C413 

   

C2-k333-00 

0402 

333P 

C855 

   

C2-J473-00 

0402 

473P 

C872 

   

C2-k563-00 

0402 

563P 

C411 

   

C2-k104-00 

0402 

104P 

33

C516.C514.C512..C886 

C883.C864.C857.C851.C837 
C836.C833.C822.C555.C494 
C493.C491.C445.C441.C440 

C410,C155.C457.C455 

C296,C376,C375,C309,C103
C282,C281,C278,C382,C473

C2-k224-00 

0402 

224P 

C417 

C263,C261 

C2-Z105-00 

0402 

105P 

C446,C452 

C477 

C5-Z475-00 

0805 

4.7uF 

11

E151.C415 

E371,C475,C474,E422,C257

C121,C123,C276,C124 

C5-J104-00 

0805 

0.1uF 

   

E363,E361 

C5-k105-00 

0805 

1uF 

C106 

E362 

CA-T225-16 

2.2uF/16V 

E417.E435 

   

CA-T106-10 

10uF/10V 

E871.E854 

E365,E907,E905 

CA-T105-16 

1uF/16V 

E491 

   

CA-T475-16 

4.7uF/16V 

   

E373,C305 

CB-T226-16 

22uF/16V 

   

E481,E261 

CC-T107-06 

100uF/6V3 

   

E473 

   

   

   

   

 

   

   

CT-0060-00 

   

6PF 

   

   

CV331,CV321 

L9-0301-00 

0603 301T 

   

1 L886 

   

L9-0101-00 

0603 101T 

   

4 L851.L101 

L376,L391 

L3-0682-01 

0603 6.8nH 

   

 

 

L142,L134 

L3-0273-01 

0603 27nH 

   

 

 

L311,L237 

L3-0475-00 

0603 4.7uH 

   

1 L454 

   

L3-0104-00 

0603 100nH 

   

 

 

L221,L362 

L3-0105-00 

0603 1uH 

   

 

 

L291 

L3-0224-00 

0603 220nH 

   

 

 

L333,L331,L323,L321,L135

L113 

L3-0333-00 

0603 33nH 

   

 

 

L141,L131 

L3-0824-00 

0603 820nH 

   

 

 

L243 

L3-0223-00 

0603 22nH 

   

 

 

L247 

L3-0183-00 

0603 18nH 

   

 

 

L361 

L9-2811-06 

0.28X1.1X

6TL 

6T 

   

   

L216.L224.L227.L215 

L9-3516-07 

0.35X1.6X

7TL 

7T 

   

   

L121 

L9-0514-04 

0.5X1.4X4

TL 

4T 

   

   

L211.L111.L112 

L9-0311-03 

0.3X1.1X3

TL 

3T 

   

   

L322 

L9-0315-03 

0.3X1.15X

3TL 

3T 

   

   

L332 

D0-302T-00 

SLS-YGUR30

2TM  

LED3225 

   

D821 

   

D0-0372-00 

1SS372 

USM 

   

D417 

   

D0-0122-00 

KDS122 

USM 

   

D491 

   

D0-0154-00 

KDV154 

USC 

   

   

D321,D215,D227,D224,D216

 


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15

D0-0376-00 

MA2S376 

   

   

   

D332,D322 

D0-0131-00 

HVC131 

ESC 

   

   

D211,D112,D111,D361 

D0-0114-00 

KDS114 

USC 

   

   

D141,D249 

Q0-4008-00 

PD54008L 

2-5N1A 

   

   

T120 

Q0-3078-00 

2SK3078 

SOT89 

   

   

T130 

Q0-1824-00 

2SK1824 

ESM 

   

T571.T561.T551 

T581 

Q0-305S-00 

KRA305 

USM 

   

T455.452 

T296,T481,T202,T101,T301

Q0-404S-00 

KRC404 

USM 

   

11

T822.T821.T162.T151.T456 

T483,T477,T305,T304,T273

T263 

Q0-2014-00 

KTA2014 

USM 

   

T881 

   

Q0-4075-00 

KTC4075 

USM 

   

T417.T433.T430 

   

Q0-4080-00 

KTC4080Y 

USM 

   

   

T251 

Q0-4226-00 

2SC4226 

USM 

   

   

T361,T331,T321,T311,T140

T241,T221 

U0-UDIO-00 

TMP87P805B

QFP44 

   

U811 

   

U0-UDIO-00 

AUDIO 

SOP8 

   

U511 

   

U0-LC08-00 

24LC08 

SOP8 

   

U835 

   

U0-7233-00 

TDA7233 

SOP8 

   

   

U411 

U0-5002-00 

XC62FP5002

PR(5A) 

SOT89-5A 

   

   

U906 

U0-324V-00 

NJM324 

SSOP16-225 

   

U421 

   

U0-1136-00 

TA31136F 

SSOP16-225 

   

   

U261 

U0-2332-01 

LMX2332 

SSOP20-225 

   

   

U311 

U0-2904-00 

NJM2904V 

SSOP8 

   

U161 

   

U0-7385-00 

LC7385M 

U-SOP18-245     

U591 

   

L0-4500-02 

6060-2S 

JTB450CM 

   

   

CR262 

Y0-1280-05 

DS0305 

12.8MHz 

   

   

CR311 

Y0-3276-00 

DS7325-MC2

06 

32.768KHz 

   

CR881 

   

Y0-3580-01 

FX-CS20 

3.58MHz 

   

CR596 

   

 

 

 

 

 

 

 

 

 

 


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16

Adjust Description and specifications 

 

Use programmer or PC software to program XT-600PLUS(4) , or by manual program , eg . To program 
XT-600PLUS(4) by manual as follows: 

一、

Instrument:

 

Synthesized test instrument 

 

1 set         

       

 

Scanner 

                                   

1 set                 

 

3A/10V power                          1 set                 

 

Digital Voltmeter                      1 set               

 

3A DC Ammeter                        1 set                 

 

 

二、

Adjust

 

1

Initialization:  It is necessary to initialize the transceiver because there is useless data in 

EEPROM. So make initialization before adjust.

 

After set the Initialization data on PC, connect 

the radio by program line, then turn on the radio power, you can write in Initialization data. 

2

Adjustment: The adjustment of XT-600PLUS(4), some are conducted in PC communication 

mode; some are in manual program mode. Turn on the power and enter the manual program 
mode.

 

 

VCO SECTION: 

 

 

measurement

 

Adjustment

 

ITEM

 

CONDITION

 

Test equip

 

terminal

part

 

Method

 

Specificati

ons/Re 

mark

 

1

.Setting

 

1

power 7.5V

 

 

 

 

 

 

 

 

 

 

1

TX high frequency

enter 

the manual program mode
and press the PTT

 

4.0V±0.1V  

2

Transmit 

VCO1.CH: 
lock voltage

 

2

TX low frequency

enter 

the manual program mode
and press the PTT

 

CV321 

>0.7V  

1

RX high frequency

enter 

the manual program mode
and press the MONI

 

3.8V±0.1V  

3

Receive 

VCO1.CH: 
lock voltage

 

2

RX  low frequency

enter 

the manual program mode
and press the MONI

 

Digital 

Voltmeter

 

CV 

CV331 

>0.7V  

Adjust the Transmitter section: 

Measurement

 

Adjustment

 

Item

 

Condition

 

Test equip

 

Terminal

parts

 

Method

 

Specificati

ons 

/Remarks

7

Transmit 

frequency

 

1

TX center 

Turn to manual mode
and press the PTT

 

Synthetical 

test

 

ANT RV361 

Adjust to the center 

frequency 

the error

±250Hz

8

MAX DEV

最大频偏

  1

TX center frequency 

Turn to manual mode
and press the PTT

 

Synthetical 

test

      LPF: 

15kHz   

AF 1kH

ANT   

RV422 

Adjust the 

frequency error

 

to

:4.2kHz±100Hz 

 

 


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17

  

AF:1kHz 

 

120mV 

 

 

 

 

9

FM 

Sensitivity

 

1

TX center 

Turn to manual mode
and press the PTT

 

Synthetical 

test

     

FILTER:  

0.3-3.4kHz 

AF:1kHz  

15mV 

ANT   

 

Check

 frequency 

error :2.2kHz-3.6kHz 

 

1

TX center and with 

67.0Hz CTCSS, turn
to

 manual mode

 

67.0Hz  

CTCSS

10

 CTCSS 

balance  2

TX center and with 

250.3Hz CTCSS, turn
to

 manual mode and 

press the PTT

 

Synthetical 

test

      LPF: 

300Hz 

ANT  

Adjust 

VR3

,the test value of 

on 

condition 1 & condition 2 is 

consistent, the 

difference 

value<=

200Hz  

250.3Hz 

CTCSS

 

11

CTCSS 

frequency 
error 

1

TX center frequency

CTCSS:67.0Hz turn to

manual mode

 

Adjust the 

frequency error

 

to

:0.65kHz

±

100Hz 

 

12

CDCSS 

frequency 

error 

1

TX center frequency

CDCSS:023 turn to

manual mode

 

Synthetical 

test

     

LPF:300Hz

ANT  

Adjust the 

frequency error

 

to

:0.65kHz

±

100Hz 

 

13

.Low 

Battery alarm 
level

 

Turn to manual mode, 

Adjust the battery to 
5.7V

   

Digital 

voltmete

 

 

 

 

Adjust so that the LED 

flashes

 

 

 

 

 

 

Adjust the receiver section:

 (enter manual mode first)

 

 

Measurement

 

Adjustment

 

Item

 

Condition

 

Test equip

 

Terminal

parts

 

Method

 

Specificati

ons 

/Remarks

 

4

.Band-pass 

filter

 

1

RX center 

turn to channel 4 in

manual mode

 

Spectrum 

analyz

 

ANT . 

 

Adjust the undee to the 
top, the bandwidth is   
about 20MHz, the sign of
central frequency is in the 
middle of the undee 

 

 

 

5

Sensitivity

 

1

RX center 

Turn to manual mode 

 

Synthetical 

test 

SSG

 

output

:   

118dB

ANT  

         

 

 

check

 

SINAD: 

12dB or 

higher 

 

 


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18

 

2

RX low 

Turn to manual mode 

 

 

3

RX high 

Turn to manual mode 

 

-118dBm  

MOD:1KHz 
DEV:±3kHz 

FILTER:  

0.3-3.4kHz 

 

 

 

 

1

RX center 

Turn to manual mode

 

Synthetical 

test 

      SSG

 

output

:   

-117dBm 

Level 9 

Adjust to close the squelch.

 

Adjust the 

Level 9 

 squelch.

6

Squelch

 

2

RX center 

Turn to manual mode

 

 

Synthetical 

test 

      SSG

 

output:

     

-125dBm 

ANT    

RV266 

Level 3 

Adjust to close the squelch.

 

Adjust the 

Level 3 

 squelch.

 

 

 


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19

Disassembly for Repair 

Put out the battery 

Make sure close the transceiver, than press down battery locking tap, and then pull

 

down the battery pack.

 

 

Put out the cassette(aluminum hull and PCB board) 

1

Put down the 2 crews which in the transceiver bottom.

 

2

Pull out the volume knob and channel knob button

 

3

Turn the antenna

 

4

Pull down the mic-cover bolt and mic-cover.

 

编码旋钮

螺钉

螺钉

咪盖

音量旋钮

 

 

Put up the aluminum hull bottom, then pull out the base.

 

 

 

Pull down as follow 

 


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20

 

 

Put down the PTT button   

Pull out the PTT button from the front cover. 

 

Put on the PTT button

 

Put the double glue on the front cover. 
Then push the PTT button into the hole which in the front cover.   

 

Put on the battery

 

Put the base of the battery to the radio aluminum hull rabbet and push, then press the top 

of the battery to the radio until you heart a ”click” sound, it will be OK.   

 

 
 
 
 
 
 

 


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21

Component plans 

 

 

 
 
 
 
 
 
 
 
 
 
 
 
 

 

 


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22

 

FCC Compliance 

This equipment has been tested and found to comply with the limits for a Class B digital 
device, pursuant to part 90 of the FCC Rules. These limits are designed to provide reasonable 
protection against harmful interference in a residential installation. This equipment generates, 
uses and can radiate radio frequency energy and, if not installed and used in accordance with 
the instructions, may cause harmful interference to radio communications. However, there is 
no guarantee that interference will not occur in a particular installation. If this equipment does 
cause harmful interference to radio or television reception, which can be determined by 
turning the equipment off and on, the user is encouraged to try to correct the interference by 
one or more of the following measures: 
· Reorient or relocate the receiving antenna. 
· Increase the separation between the equipment and receiver. 
· Connect the equipment into an outlet on a circuit different from that to which the 
receiver is connected. 
· Consult the dealer or an experienced radio/TV technician for help. 
Modifications not authorized by the manufacturer may void users authority to operate this device. 

 
FCC Licensing Requirements 

Your radio must be properly licensed Federal Communications Commission prior to use. 
Your dealer can assist you in meeting these requirements. Your dealer will program each 
radio with your authorized frequencies, signaling codes, etc., and will be there to meet your 
communications needs as your system expands. 

 
Safety: 

It is important that the operator is aware of and understands hazards common to the 
operation of any radio. 
READ THIS IMPORTANT INFORMATION ON SAFE AND EFFICIENT OPERATION. 
The EUT is Face-held only, not allow to body-worn configuration, the safety distance should be at least 
2.5 cm.