TTI TCB-550 Manuale utente

SERVICE

MANUAL

MULTI CHANNEL AM/FM TRANSCEIVER

TCB-550

TTI Tech

Downloaded from www.cbradio.nl

SECTION 1 SPECIFICATIONS

SECTION 2 CIRCUIT DESCRIPTION

1 GENERAL

2 TECHNICAL DESCRIPTION

3 SEMICONDUCTORS AND FUNCTION

4 DESCRIPTION OF FREQUENCY DETERMINING AND STABILIZING CIRCUIT

5 TEST EQUIPMENT SETUP AND ALIGNMENT INSTRUCTIONS

SECTION

5-3 LED PCB

3 PART LIST

SECTION

5-1 MAIN PCB

5-2

5-4 VOLUME PCB

5-5 MIC PCB

FRONT PCB

4 MECHANICAL DISASSEMBLY

SECTION 5 BOARD LAYOUT

SECTION 6 BLOCK DIAGRAM

SECTION 7 SCHEMATIC

TABLE OF CONTENTS

SECTION1 SPECIFICATIONS

Channel

Frequency Range

Operating mode

Frequency Control

Frequency Tolerance

Operating Temperature Range

Microphone

Input Voltage

Size

Weight

Antenna Connector

Power Output

Modulation

Frequency Response

Output Impedance

Harmonic Suppression

Current Drain

Receiving System

IF Frequencies

Sensitivity

Audio Output Power

Audio Distortion

Image Rejection

Adjacent Channel Rejection

Conducted Spurious

Frequency Response

Built-in Speaker

Squelch

* Specification is subject to change without prior notice.

40 (See the frequency band chart)

26.56 MHz ~ 28.00 MHz

F3E (FM), A3E (AM)

PLL Synthersizer

0.002%

-10 to + 55 C

Plug-in Type

13.2V DC ± 15%

124 (W) x 135 (L) x 37 (H)

655 g

Antenna Connector

Duty cycle 10% 4 Watts @13.2V DC

AM:from 85% to 95%

FM:1.8KHz ± 0.2KHz

300Hz to 3000Hz

50ohms, Unbalanced

More than -36dBm

AM Full Mod. 1.6A Max.

Dual conversion superheterodyne

Double Conversion 1st 10.695MHz/2nd 455KHz

0.7 V for 10dB(S+N)/N

in AM Mode

0.5 V for 20dB SINAD in FM Mode

2.0W @ 8 Ohm

Less then 8% @ 1KHz

60 dB

More than 60 dB

300 to 2500Hz

8 Ohms, round

Adjustable; Threshold less than 1 microvolt

------------ Contents -------------

1General

1-1. Receiver

1.2. Transmitter

2. Technical Description

2-1. General

2-2. Type of emission

2-3. Frequency Table

2-4. RF Power Output

2-5. DC input Voltage and Current with 13.2V DC Input to Power AMP

2-6. Receiver IF and Local Oscillator Frequencies

3. Semiconductors and Function

4. Description of Frequency Determining and Stabilizing Circuit

4-1. Introduction

4-2. Basic Synthesis Scheme

4-3. Descriptions of Each Block

4-3-1. Introduction

4-3-2. Reference Frequency

4-3-3. VCO

4-3-4. Programmable Divider and its Control

4-3-5 Phase Detector and VCO Control

4-3-6. Transmitter / Receiver Buffer AMP

4-3-7. Transmitter Doublers

4-3-8. Switching of Turning Capacitor in VCO

4-3-9. Receiver Local Oscillator Outputs

4-4. Frequency Stability

4-5. Description of other Circuits

4-5-1. Transmitter

4-5-2. Receiver

5. Test Equipm

VCO Section

Transmitter Section

Receiver Section

Test Data

Schematic Diagram

Block Diagram

PCB Map

PARTS LIST

ent Setup and Alignment Instructions

5-1.

5-2.

5-3.

10.

SECTION2 CIRCUIT DESCRIPTION

1. General

1-1. Receiver

Display : 40 Channels and other functions indication

Frequency Range : 26.965 to 27.405 [MHz]

Frequency Response : 300 to 2,500 [Hz]

Power Source : 13.2 [V] DC

Audio Output Load : 8 [OHM] Resistive

Audio Output : 4.0 [W] (or More)

Squelch : Adjustable from 0.2[uV] to 1 [mV]

Sensitivity :

-FM : 20 dB [SINAD] under 1.0 [uV] or less

-AM :10 dB [S/N] under 1.0 [uV] or less

Intermediate Frequency :

-1st IF : 10.695 [MHz]

-2nd IF : 455 [KHz]

1-2. Transmitter

Carrier Power(Conducted) : AM 1 [W] / FM 4.0 [W]

Current Drain ( 13.2 [V] Supply Voltage)

-No Modulation : 1,100 [mA] (No Modulation)

-Max Modulation : 1,400 [mA] (Full Modulation)

Modulation Capabilities

-AM : +/- 90 [%]

-FM : +/- 1.8 [KHz/Dev]

Spurious Radiation : Less then -74 [dBc]

Antenna Impedance : 50 [OHM]

Frequency Tolerance : 0.002 [%]

2. Technical Description

2-1. General

Model CB-550 is an mobile type AM/FM radio transceiver for use of the Citizen Radio Service.

Front Panel Controls

LCD Display(Cannel ,RX,TX,AQ,SCAN,AM,FM,EMG Indicator).

Receiver Audio Control (With Power ON/OFF Control) Volume

Squelch Control Volume (S/W ON : TIGHT, S/W OFF : AUTO SQ)

RF Gain Control Volume

CHANNEL UP/DOWN TACT SWITCH.

AM/FM TACT SWITCH

EMG TACT SWITCH

Accessable Connectors

Antenna Jack

External Speaker Jack

External Power Cord

Microphone Jack.

Transmitter Power AMP ----------- VOLTAGE 12.5 V

Current 820mA

Transmitter DRIVER AMP --------VOLTAGE 12.5 V

Current 130mA

2-2. Type of em

2-3. Frequency Range : 26.965 MHz (CH.1) - 27.405 MHz (CH.40)

2-4. RF Power Output : AM/FM 4.0 Watts

2-5. DC Input Voltage and Current With 13.2V DC Input to Power AMP

FIRST IF -------------------------------- 10.695 MHz

SECOND IF ---------------------------- 455 KHz

FIRST LOCAL OSCILLATOR------- 10.965 MHz Below RECEIVING FREQUENCY

SECOND LOCAL OSCILLATOR--- 10.240 MHz

2-6. RECEIVER IF AND LOCAL OSCILLATOR FREQUENCIES.

ission : AM(A3E) , FM(F3E)

2-3. SEMICONDUCTORS AND FUNCTION

REF.NO

*** MANUFACTURER INFORMATION ***

* K.E.C --------------- KOREA ELECTRONICS SEMICONDUCTOR CO.,LTD.

* TOSHIBA -------------- TOSHIBA SEMICONDUCTOR CO.,LTD.

* SANYO ---------------- JAPAN SANYO SEMICONDUCTOR CO.,LTD.

* SGS --------------------- SGS THOMSON SEMICONDUCTOR CO.,LTD.

DESCRIPTION RX TX REMARK

QR1

QR2

QR3

QR4

QR5

QR6

QR7

QQ1

QQ2

QQ4

QAS1

QAS2

QAS3

QAS4

QFS1

QFS2

QUS1

QRS1

QTS1

QG1

QG2

QG3

QG4

QG5

QHL1

QV1

QW1

QW2

QN1

QN2

QT2

QT3

QT4

IC1

IC2

IC3

IC4

IC5

IC6

IC7

KTC4080E

KTC4075E

KTC4080E

KRA2014E

KRC410E

KTC4075E

KRC402E

KRC410E

KRA305E

KRC402E

KRC410E

KRC402E

KRC410E

KRC404E

KTC4075E

KTA2014E

KTA1658

KTA2014E

KRC401E

KTC3875S

KRC402E

KTC4080E

KRC401E

KRA305E

KTC4080

2SC2314

2SC2078

KRA226S

KRC401E

KRC404E

DBL5019

KIA358F

TDA2003

24WCO2J

TMP86FM29UG

LC7152

KIA358F

RF AMP

1'st MIXER

RF ATTENUATOR

IF AMP

A.N.L.

SQ MUTE

RF ARRENUATOR

AUTO SQ S/W

FM MUTE

AM B+

AM B+ CONTROL

POP MUTE

SQ CONTROL

RX B+

MAIN REGULATOR

CPU REGULATOR

VCO

LCD BACK LIT

CPU RESET

FM 1F

SQ CONTROL

EEPROM

CPU

PLL

RF ATTENUATOR

AM AUDIO PATH

FM AUDIO S/W

TX B+

TX POWER REGULATOR

MAIN REGULATOR

CPU REGULATOR

POWER HI/LOW S/W

VCO

BUFFER

DOUBLER

TX ENABLE

TX ENABLE B+

BUFFER

DRIVER

POWER AMP

LCD BACK LIT

CPU RESET

TX AM AUDIO AMP

EEPROM

CPU

PLL

TX FM AUDIO AMP

KEC

SANYO

KEC

AUK

KEC

SGS

HOLTEK

TOSHIBA

SANYO

KEC

4. Description of Frequency Determining and Stabilizing Circuitry

4-1. Introduction

The Frequencies for transmitter and receiver first local frequencies are all derived from a signal

10.695MHz cry

Phase lcoked loop.

stal and second local frequencies are derived from 10.240 MHz crystal by means of a

The first local oscillator frequencies are 16.270MHz(CH1) to 16.710MHz(CH40). The second local

frequency is fixed at 10.240MHz to generate second IF 455KHz.

Transmit, the VCO of the PLL operates 13.4825MHz(CH1) to 13.7025MHz(40CH). The VCO frequency

goes to the doublers circuit DW2, LT1, LT2 which doubles the frequency to generate 26.965MHz(CH1)

to 27.405MHz(40CH).

QV1

VCO

QW1

Doublers

13.4825MHz(CH1)

13.7025MHz(CH40)

26.965MHz(CH1)

27.405MHz(CH40)

To transmitter

The VCO operating frequency for the receiver is 16.27MHz(CH1) to 16.710MHz(CH40) as the

first local oscillator, injected through the buffer amplifier Q302 into the first FET balanced mixer QR2,3.

4-2. Basic Synthesis Scheme

The crystal frequency(10.24MHz) is divided by4069times to make 2.5KHz which is fed to one

side of the phase detector. The VCO output is divided by a programmable divider, and fed to other side of

the phase detector Pin 22, 23 of IC6.

The feedback loop is closed by passing the phase detector output through an active low pass filter and using

the output to control the VCO frequency through varicap diode DV1,2.

Under locked conditions, both of phase detector input signal must be identical at 2.5KHz.

The VCO frequency is then given by ;

Receiver : Fvco / N = 0.0025 [MHz] OR Fvco = 0.0025 X N [MHz]

Since “N” is an integer, the VCO frequency can be stepped up with 2.5 KHz increments.

By suitable choice of “N” the desired output frequency can be obtained.

Channel 1 Channel 40

N Fvco N Fvco

Transmit 5393

3254

13.4825

16.2700

5481

3342

13.7025

16.7100

Receiver

See the [Table 1]for other Channels

The VCO frequency goes to the doublers circuit, with doubles the incoming signals.

VCO Output Frequency Doublers Output Frequency

Transmit

---

Transmit

CH 1 , 13.4825 MHz

CH 40 , 13.7025 MHz

26.965 MHz

27.405 MHz

Since all frequencies are obtained from the crystal controlled PLL oscillator, all outputs are

coherent with the crystal oscillator frequency and matching the same percentage accuracy.

Program Data & Frequency[Table 1]

RX TX

Channel Frequency

[MHz] N Fvco N Fvco

1 26.965 3254 16.27

5393 13.4825

2 26.975 3256 16.28

5395 13.4875

3 26.985 3258 16.29

5397 13.4925

4 27.005 3262 16.31

5401 13.5025

5 27.015 3264 16.32

5403 13.5075

6 27.025 3266 16.33

5405 13.5125

7 27.035 3268 16.34

5407 13.5175

8 27.055 3272 16.36

5411 13.5275

9 27.065 3274 16.37

5413 13.5325

10 27.075 3276 16.38

5415 13.5375

11 27.085 3278 16.39

5417 13.5425

12 27.105 3282 16.41

5421 13.5525

13 27.115 3284 16.42

5423 13.5575

14 27.125 3286 16.43

5425 13.5625

15 27.135 3288 16.44

5427 13.5675

16 27.155 3292 16.46

5431 13.5775

17 27.165 3294 16.47

5433 13.5825

18 27.175 3296 16.48

5435 13.5875

19 27.185 3298 16.49

5437 13.5925

20 27.205 3302 16.51

5441 13.6025

21 27.215 3304 16.52

5443 13.6075

22 27.225 3306 16.53

5445 13.6125

23 27.255 3312 16.56

5451 13.6275

24 27.235 3308 16.54

5447 13.6175

25 27.245 3310 16.55

5449 13.6225

26 27.265 3314 16.57

5453 13.6325

27 27.275 3316 16.58

5455 13.6375

28 27.285 3318 16.59

5457 13.6425

29 27.295 3320 16.60

5459 13.6475

30 27.305 3322 16.61

5461 13.6525

31 27.315 3324 16.62

5463 13.6575

32 27.325 3326 16.63

5465 13.6625

33 27.335 3328 16.64

5467 13.6675

34 27.345 3330 16.65

5469 13.6725

35 27.355 3332 16.66

5471 13.6775

36 27.365 3334 16.67

5473 13.6825

37 27.375 3336 16.68

5475 13.6875

38 27.385 3338 16.69

5477 13.6925

39 27.395 3340 16.70

5479 13.6975

40 27.405 3342 16.71

5481 13.7025

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