Wouxun Kg-uv920r User manual

Twin Band Mobile Radio Service Manual

1 2 3 4

321

U/V

AMP

8T-U BATTo

D338,D339,D326

U512

CMX138

DQT-U

15U36

DCS-U

LPF

TX/RX-U

VCO

Ripple

Filter

5C-U RF

AMP

BUFF

AMP RF

AMP T/R

5C-U

5R-U 8T-U

1st

MIXER BPF RF

AMP BPF

5R-U

TUNE

MCF

AMP

29.25MHz

5R-V

CF 450KHz

FMIF

TA31136F

28.8MHz 5R-V

ANSQL

DEV-V

24C64

VOICE

CLK

DATA

CLK

MOD-U

MUTE

BATT

SW DC

BATT

P_SPK2

CR111

U111 T115

T133 T116

T132

T117 D121,D142 T139 T140 T325 T326

D332,T332,T329

T539

T537

FL521,FL522T520

T736

T734

T735

11.0592MHZ

450KHz

PHONE

JACK

JK713

CPU

U912

U725

U729

T114

SP714

Do-U

Fin-U

5C-U

U/V

BPF

AMP

BPF

AMP T/R

5C-V 5R-V 8T-V

1st

MIXER BPF RF

AMP BPF

5R-V

TUNE

T120 D122,D144 T138

T540

LPF

5R-V

LPF

T/RX-U

VCO

Ripple

Filter

5C-V RF

AMP

BUFF

AMP

5C-V

MOD-V

T118

T134 T119

T121

Do-U

Fin-U

5C-V

T238

U512

AMP

RADIO

DATA

CLK

DATA

BUSY

MCF

AMP

38.85MHz

5R-U

450KHz

FMIF

TA31136F

38.4MHz

5R-U

SQL-U

DEV-U

FL519,FL520

T527

450KHz

U512

15U36

PLL-CLK

PLL-LE-V

CR114

U114

19.2MHz

SW-10

TCXO-U

T112 SW

D330

U/V RF

AMP

T331

Multi-AF

T327 T328 D331

U/V U/V

rectifier

D341 T336

compare

AMP

rectifier

APC

LPF

D329

SW-2

IC312

LPF

D342

LPF

BATT 8T-U 8T-V

8T-U 8T-V

D333,D334,T334

D527,D528,D327

D335,T333,T330

D336,D337,T335

5R-U

DCS-V

19.2MHz

SW-1

TCXO-V

T113

PLL-Data

PLL-CLK

PLL-LE-U

PLL-Data

8T-V8T-V

32.768KHz

T501

TX-U

TXCO-U 138-CLK

138-Rdata 138-CSN-U

138-DATA

6.144MHz

AMP

1/2V

U523

MOD-U

SQL-U

AMP

U522

MIC

DEV-U

AFi-U

U518

MT8870

DTMF-TOE-U

DTMF-STD-U

DEV-UAMP

U522

3.58MHz

5R-U

U460

CMX138

DQT-V

TX-V

TXCO-V 138-CLK

138-Rdata

138-CSN-V

138-DATA6.144MHz

AMP

U523

MOD-V

SQL-V

AMP

U523

MIC

DEV-V

AFi-V

U519

MT8870

DTMF-TOE-V

DTMF-STD-V

DEV-VAMP

U523

3.58MHz

1/2V

U460

CMX138

AFi-V

M62363FP-CLK

M62363FP-LD

M62363FP-Data

SW714

MOD-V

MOD-U

SW-8

DTMF-V

MOD-V

APC

AFo-V

AFi-V

TUNE-V

AFo-U

AFi-U

TUNE-U

DTMF-U

AFi-U SW

SW713

SW-11

RXo SW

SW714

SW-13

SW713

SW-15

RXo

RXi

RXD

TXD

中转接口

有线复制接口

写频接口

PHONE

JACK

JK714

SP713

L4600

U742

STANDBYSW

T737

BATT

P-SPK1

T738 5V

Filter

AFo-V SW

SW714

SW-14

AFo-U SW

SW713

SW-16

TA7368P

U730

T732

POWER

控制面板接口

MOD-U

Multi-AF

HT9200

CLK

DATA U724

Multi-AF

3.58MHz

SW714

SW-13

SW713

SW-15

Multi-AFFM-AF/DTMF/VOICE

SW POWER

BATTo

T818,T825

BATT

U812

Regulator

8V U811

Regulator

8T-U

TX-U

TX-V 8T-V

T819 T812

T820 T811

5R-U

5R-V

RX-V

RX-V 5C-V

T816 T822

T817 T823

RX-U DC

T814 T821

5V DC

TX-U

5C-U

T815 T824

TX-V

RX-U

SW FAN

BATT

FAN

JP812

DATA

CLK

BATT

CLK

MIC

AFo 4V 5V

U733

Regulator

U781

74HC595

SW-1

SW-4

SW-3

SW-2

SW-5

SW-8

SW-7

SW-6

U781

74HC595

SW-10

SW-13

SW-12

SW-11

SW-14

RX-V

SW-16

SW-15

STcp

SHcp

STcp

SHcp

BATT

DET BATT Tes t

P-SPK1FAN

138-Data

138 -CSN- U

DTMF-TOE_U

138 -CSN- V

FM-SCLK

FM-Data

ROM-CLK

Voice-CLK

Filter

CLK-PLL/DAC

Data-PLL/DAC138-CLK

PLL_LE- V

PLL_LE- U

DAC-LD

595-STcp

MCU-CS

TXD

TEM

RXD

Voice-BUSY

MCU- CL K

MCU- DA TA

Voice-Data

DTMF-STD_V

DTMF-STD_U

RX-U

HT9200-Dat a

138 -RData

P-SPK2

DTMF-TOE_V

ROM-Data

ROM-WP

HT9200-CLK

BATT Test 595-Ds

595-SHcp

TEMP

DET TEMP

BATT

U752

rectifier

D340

I Structure of Frequency

This model uses twice frequency conversion. For UHF band, the 1st IF is 38.85MHz, and the 2nd IF is

455KHz; For VHF band, the 1st IF is 29.95MHz, and the 2nd IF is 450KHz.The 1st local oscillations is

provided by PLL circuit. PLL circuit is also produced the necessary transmitting frequencies(see Chart

I). A, B, C, D frequency points of Chart I are as followings:

Chart I

Structure of

Frequency A C B D

（1）136~174.995MHz 165.250~204.245MHz 400~470.995MHz 429.25~500.245MHz

（2）136~174.995MHz 165.250~204.245MHz 450~520.995MHz 479.25~550.245MHz

（3）136~174.995MHz 165.250~204.245MHz 245~245.995MHz 274.25~275.245MHz

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ReceivingⅡ

Chart II

(1) The front end of U Band (RFAmplifier)

The signal which is received from the antenna enters the transmission/receive change-over switch

diode circuit (D332, D333, D338 and D339), then goes through BPF(L1560, L561 and L562), and is

enlarged by RF amplifier (T539). The signal goes through the BPF (L544 and L545), and then enters

the mixing. These BPF is adjusted by the variable condenser(D531，D532，D533，D534 ). Input

voltage through the the variodencer is adjust to output voltage by the D/A switch (U723).(See Chart II)

(2)The front end of V Band(RF Amplifier)

The signal which is received from the antenna enters the transmission/receive change-over switch

diode circuit (D335，D336，D527 and D528), then goes through BPF(L568, L543 and L546), and is

enlarged by RF amplifier (T540).The signal goes through the BPF(L566), and then enters the mixing.

These BPF (D541, D542, D535 and D536)adjusted by the variable condenser. The input voltage by

variable condenser is adjusted by the outputting voltage by D/A switch (U723).( See Chart 2)

(3) The 1st Mixer

The signals from the front end of U Band and the Rx LO prouduced by PLL electro circuit creat the 1st

intermediate frequency signal of 38.850MHz on T537 Mixing. The 1st intermediate frequency signal

enters the crystal filter FL519 and FL50（UM5-3P 38.85M）to eliminate the signals from the adjacent

channels.

The signals from the front end of V Band and the Rx LO prouduced by PLL electro circuit creat the 1st

intermediate frequency signal of 29.250MHz on T323 Mixing. The 1st intermediate frequency signal

enters the crystal filter FL521 and FL522（UM5-3P 29.25M）to eliminate the signals from the adjacent

channels.(See Chart II)

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(4)Intermediate Frequency Enlarging Circuit

For U band, the 1st intermediate frequency signal via filter enters the 1st intermediate frequency

amplifier T527(2SC4215) to amplify and enter the intermediate frequency system IC U524. The

intermediate frequency system chip provides 2nd mixer, 2nd local oscillations’ signals, limiting

amplifier, orthogonal intersection detector and RSSI(Receiving Signal Strength Indicator). The 2nd

mixer mixes the 1st intermediate frequency signal and the 2nd local oscillations’ signals output, and

then creates the 2nd intermediate frequency signal 450KHz. The 2nd intermediate frequency signal

continuously eliminate the signals from the adjacent channels via ceramic filter(FL515). The 2nd

intermediate signal through filter is enlarged by limiting amplifier and demodulated by orthogonal

detector with chinaware discriminator (CR514). The demodulated signal enters the tone circuit.

For V band, the 1st intermediate frequency signal via filter enters the 1st intermediate frequency

amplifier T528 (2SC4215) to amplify and enter the intermediate frequency system IC U525. The

intermediate frequency system chip provides 2nd mixer, 2nd local oscillations’ signals, limiting

amplifier, orthogonal intersection detector and RSSI(Receiving Signal Strength Indicator). The 2nd

mixer mixes the 1st intermediate frequency signal and the 2nd local oscillations’ signals output, and

then creates the 2nd intermediate frequency signal 450KHz. The 2nd intermediate frequency signal

continuously eliminate the signals from the adjacent channels via ceramic filter(FL5156). The 2nd

intermediate signal through filter is enlarged by limiting amplifier and demodulated by orthogonal

detector with chinaware discriminator (CR515). The demodulated signal enters the tone circuit.(See

Chart II)

（5）ToneAmplifier Circuit

For U band, after transmitting to the tone processor U512 to process the circuit, the demodulated

signal outputs to U723 volume control IC from the 23rd foot tube, and outputs to speaker after being

enlarged by tone power amplifier (U742).

For V band, after transmitting to the tone processor U460 to process the circuit, the demodulated

signal outputs to U723 volume control IC from the 23rd foot tube, and outputs to speaker after being

enlarged by tone power amplifier (U742).（See Chart II）

(6) Squelch

For U band, FM IC (U524) and V band, a part of AF signal outputted by FM IC(U460) enters IC again.

Noise components are amplified and amended via filter and amplifier, and creates the appropriate DC

voltage with the noise PWL.

DC signal is sent to the 18th foot analogue port of tone processor IC (U512) via FM IC. U912

determines if outputs the voice via speaker by checking the inputted data by the tone processor IC

(U512). When the speaker outputs voice, the 14th foot of microprocessor (U912) transmits the high

level signals to P-SPK1 line, and opens AF AMP (U742) via T737. See Chart III

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Chart III

III Synthesis of PLL Frequency

PLL circuit creates the local oscillator signals for receiving and RF signals for transmitting.

Chart IV

(1) PLL

The step frequency for PLL circuit is 5KHz or 6.25KHz.

Reference oscillation signals of 14.4MHz and 19.2MHz are split frequencies by a fixed counter on

U111 and U114. The outputted signals from VCO of V/U band oscillator are respectively buffered and

amplified by T116 and T115, and then are split frequencies by a programmable two-module counter on

U111 and U114. The signals of splitting frequencies are separately compared in the phase comparator

of U111 and U114. The two created signals go through different low pass to filter, and then separately

transmits to U/V VCO to control the oscillation frequencies.( See Chart IV)

(2) VCO

cVCO for U Band

For U band, the used frequency points are created by T113 for transmitting and receiving.

Transmit the VCO controlling voltage that is obtained from the phase comparator to variable diode

(D116, D112) to control oscillation frequency. The signals from the oscillated frequency are amplified

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by T116 and T117, and then are transmitted to RF amplifier and receiver separately via D142 and

D135. ( See Chart IV)

dVCO for V Band

For V band, the used frequency points are generated by T134 for transmitting and receiving.

Transmit the VCO controlling voltage that is obtained from the phase comparator to variable diode

(D116, D114) to control oscillation frequency. The signals from the oscillated frequency are amplified

by T116 and T117, and then are transmitted to RF amplifier and receiver separately via D144 and

D122. ( See Chart IV)

IV Transmitting Segment System

(1) Speaker Amplifier

The signals from the speaker via U611 are adjusted maximum frequency deviation by U band tone

processor (U512) and V band tone processor (U460), and then are sent to VCO of U or V band to

modulate and input. (See Chart V)

Chart V

(2) Driver and Terminal Amplifier

cThe signals from U band T/R switch (D142 ON) are amplified by pre-driver amplifier (T139,

T2140). The signals from V band T/R switch (D144 ON) are amplified by pre-driver amplifier (T138).

The amplified U/V signals are separately transmitted to the driver amplifier (T325, T326) to 5W.

The output of the driver amplifier is amplifier to 50W（when on low power level, it is 25W）by RF

power amplifier (T331). For U band, the output of RF power amplifier passes harmonic filter(LPF)

and antenna switch(D332, D333), and then is sent to antenna terminal. For V band, the output of RF

power amplifier passes harmonic filter (LPF) and antenna switch (D335, D335), and then is sent to

antenna terminal.(See Chart VI)

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ChartVI

(3) Auto Power Control (APC) Circuit

For U band, a part of the output from RF power amplifier is commuted to DC voltage by D340, D341

and T336, and then is sent to APC IC312. APC IC312 produces a controlled voltage by comparing DC

voltage and the 3rd output reference voltage from U723 D/A converter. And the controlled voltage is

provided by auto power controlled tube T327, T328, pre-driver amplifier T325, driver amplifier T326

and power amplifier T331.So that it still can continuously output stable power under the changing

antenna loading condition.

For V band, a part of the output from RF power amplifier is commuted to DC voltage by D341, D342

and T336, and then is sent to APC IC312. APC IC312 produces a controlled voltage by comparing DC

voltage and the 3rd output reference voltage from U723 D/A converter. And the controlled voltage is

provided by auto power controlled tube T327, T328, pre-driver amplifier T325, driver amplifier T326

and power amplifier T331.So that it still can continuously output stable power under the changing

antenna loading condition. (See Chart VI)

(4) Encoding Signaling

QT/DQT

For U band, DQT/QT data is outputted by the 13th tube foot of tone processor IC U512. A part of

signals are sent to TCXO CR111 via IC U523B. Another part of signals are mixed with tone signals,

and then separately is inputted to VCO of U band.

For V band, DQT/QT data is outputted by the 13th tube foot of tone processor IC U460. A part of

signals are sent to TCXO CR111 via IC U523A. Another part of signals are mixed with tone signals,

and then separately is inputted to VCO of V band.

V Power Supply

The radio can control the power supply via the POWER key on the panel.

There are most-used power supplies 8V and 5V.

5C-V is the public 5V for V band, which keeps outputting in the un-saving mode.

5R-V is the public 5V, which keeps outputting during receiving. 5R-U is 5V for receiving on U band,

and keeping outputting during receiving.

8T-V is the 5V for transmitting on V band, which keeps outputting during transmitting. 8T-V is also

5V for transmitting on U band, and keeps outputting during transmitting.

There are another two general supplies, BATT+ and BATT. BATT+ is the inputted power supply,

BATT is the power supply that is controlled by the power supply switch.

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VI Control Circuit

The control circuit is consist of the micro processor(U912) and the outside circuit. It controls TX-RX

unit. The main functions for the U912 are as followings:

Switch the TX-RX state according to the signal input from PTT.

Read out the data of the systems, groups, frequencies and programming from the memory circuit.

Transmit the data of the frequencies to PLL.

Control the ON&OFF of the squelch according to the DC voltage ouput from the squelch circuit.

Control the tone mute according to the data of the decoder.

1）Memory Circuit

The memory circuit is consist of the CPU(U912) and EEPROM(U912).

The capacity is 256K bits, including the control program used on the CUP of the hand-held sets and

the datas of the channels and operating functions.( See PIC7)

Chart VII

2）Prompt of Low Voltage

Monitor the battery voltage through the micro processor. When the battery voltage is in low state, there

is prompt transmit for warning.( See Chart VII)

Chart VIII

VII. Keyboard and Display Circuit

1) Detecting for the keyboard entry

K1,K2,K3 and K4 are the output ends for the keyboard, while D1,D2,D3 and D4 are the input ends.

They conduct after being detected by the micro processor(IC811). (See PIC9)

Chart IX

2) Display Circuit

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LCD displays the information, which is controlled the unicircuit of the display driver for the screen by

the micro processor (IC811), to ensure that the LCD displays the corresponding information.（See

Chart X)

Chart X

2) Backlight Circuit

The LCD screen for this radio is using three color of the backlight, while the keyboard is using the

solid color. The backlight is controlled by the micro processor(U912). (See PIC11)

Chart XI

VIII Adjustment

Public Segment

Measurement Adjustment

ITEM CONDITION Test

Facility Terminal Components Metho

SPEC/

MARK

1.Setting 1)BATT Terminal Voltage：13.8V

2)SSG Standard Modulation

[WIDE]MOD:1KHz,DEV:3KHz

[NARROW]MOD:1KHz,DEV:1.

5KHz

3.0V +/-0.1V2.VCO

Latch

Voltage RX

1) CH: High

2) CH: Low Inspecti

0.6V or

above

3.0V +/-0.1V3.VCO

Latch

Voltage TX

3) CH: High

PTT:ON

4) CH: Low

PTT:ON

Power

Meter

DVM

ANT

Inspecti

0.6V or

above

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Transmission Segment

Measurement Adjustment

ITEM CONDITON

Test Facility Terminal Components Method SPEC/

MARK

1.Frequecny

Adjustment

1) CH: High

2)PTT:ON

Frequency

Meter

High

Frequenc

+/-50Hz

2.High Power

Adjustment

Test CH: Low

Center

High

BATT Terminal

Voltage:13.8V

PTT:ON

4.0W

+/-0.1V

1.9A or

below

3. Low power

adjustment

Test CH: Low

Center

High

BATT Terminal

Voltage:13.8V

PTT:ON

Power Meter

Current Meter

ANT

1.0W

+/-0.1V

0.9A or

below

4. Maximum

Frequency

Offset

Adjustment[

Wide]

Test CH: Low

Center

High

AG:1KHz/150Mv

Frequency offset

analyzer filter

LPF:15KHz

HPF:OFF

PTT:ON

4.2KHz

(According to

Maximum)

+/-50Hz

[NARROW] Test CH: Center

PTT:ON

Power Meter

Frequency

Offset

Analyzer

oscillograph

AF VTVM

ANT

SP/MIC

Connector

2.2KHz

(According to

Maximum)

+/-50Hz

Receiving Segment

Measurement Adjustment

ITEM Condition

Test Facility Terminal Components Method SPEC/

MARK

1.Sensitivity

Inspection

[WIDE]

Test CH: Low

Center

High

SSG

Output:-117dBm(0.3

uV)

SSGMOD:3KHz

[Narrow] Test CH: Center

SSG

Output:-115dBm(0.4

SSG

DVM

oscillograph

AF VTVM

ANT

Inspection 12dB

SINAD

or above

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uV)

SSGMOD:1.5 KHz

SQL(Squelch

Threshold

Value)

Write-into

[Wide]

Test CH: Low

Center

High

SSG

Output:-123dBm(0.

16uV)

SSGMOD:3.0 KHz

[NARROW] Test CH: Center

SSG

Output:-122dBm(0.

16uV)

SSGMOD:3.0 KHz

Programming

Software

Write-into Squelch

Open

4. SQL(Deep

squelch

threshold

value)

Write-into

[Wide]

Test CH: Center

Low

High

SSG

Output:-117dBm(0.3

uV)

SSGMOD:3.0 KHz

[ Narrow] Test CH: Center

SSG

Output:-116dBm(0.3

5uV)

SSGMOD:1.5 KHz

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