TTI TCB-660 Manuale utente
SERVICE
MANUAL
MULTI CHANNEL AM/FM TRANSCEIVER
TTI Tech Co.,Ltd.
Downloaded from www.cbradio.nl
TCB-660
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 VOLUME PCB
3 PART LIST
SECTION
5-1 MAIN PCB
5-2 FRONT PCB
4 MECHANICAL DISASSEMBLY
SECTION 5 BOARD LAYOUT
SECTION 6 BLOCK DIAGRAM
SECTION 7 SCHEMATIC
TABLE OF CONTENTS
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.
T
R
A
N
S
M
I
T
T
E
R
R
E
C
E
I
V
E
R
G
E
N
E
R
A
L
40 (See the frequency band chart)
26.96 MHz ~ 27.99125 MHz
F3E (FM), A3E (AM)
PLL Synthersizer
0.002%
-10 to + 55 C
Plug-in Type
13.2V DC ± 15%
140 (W) x 186 (L) x 37 (H)
990 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
60 dB
More than 60 dB
300 to 2500Hz
8 Ohms, round
Adjustable; Threshold less than 1 microvolt
SECTION1 SPECIFICATIONS
TTI 2007-02-23
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 Equipment Setup and Alignment Instructions
5-1. General Section
5-2. Transmitter Section
5-3. Receiver Section
------------ Contents -------------
SECTION2 CIRCUIT DESCRIPTION
TCB-660 Circuit Description Page 2
TTI 2007-02-23
1. General
1-1. Receiver
①Display : 40 Channels and other functions indication
②Frequency Range : 26.965 to 27.405 [MHz]
③Frequency Response : 300 to 2,500 [Hz]
④Power Source : 13.2 [V] DC
⑤Audio Output Load : 8 [OHM]
⑥Audio Output : 4.0 [W] (or More)
⑦Squelch : Adjustable from 0.2[uV] to 100 [uV]
⑧Sensitivity :
-FM : 20 dB [SINAD] under 1.0 [uV] RF Signal or less
-AM :10 dB [S/N] under 1.0 [uV] RF Signal or less
⑨Intermediate Frequency :
-1st IF : 10.695 [MHz]
-2nd IF : 455 [KHz]
1-2. Transmitter
①Carrier Power(Conducted) : AM 4[W] / FM 4 [W]
②Current Drain ( 13.2 [V] Supply Voltage)
-No Modulation : 1,100 [mA]
-Max Modulation : 1,600 [mA]
③Modulation Capabilities
-AM : ±90 [%]
-FM : ±1.8 [KHz/Dev]
④Spurious Radiation : Less then 74 [dBc]
⑤Antenna Impedance : 50 [OHM]
⑥Frequency Tolerance : 0.002 [%]
TCB-660 Circuit Description Page 3
TTI 2007-02-23
2. Technical Description
2-1. General
Model TCB-660 is an mobile type AM/FM radio transceiver for use of the Citizen Radio Service.
zFront Panel Controls
①LCD (Channel and RX/TX).
②Receiver Audio Control (With Power ON/OFF Control) Volume
③Squelch Control Volume
④Channel UP/Down Key Switch
⑤AM/FM Select Key
⑥Scan Key
zAccessorily Connectors
①Antenna Socket
②External Speaker Jack
③Microphone(Condenser Microphone)
2-2. Type of emission : AM(A3E) , FM(F3E)
TCB-660 Circuit Description Page 4
TTI 2007-02-23
2-3. Frequency Table
Channel Frequency (MHz) Channel Frequency (MHz)
1 26.965 21 27.215
2 26.975 22 27.225
3 26.985 23 27.235
4 27.005 24 27.245
5 27.015 25 27.255
6 27.025 26 27.265
7 27.035 27 27.275
8 27.055 28 27.285
9 27.065 29 27.295
10 27.075 30 27.305
11 27.085 31 27.315
12 27.105 32 27.325
13 27.115 33 27.335
14 27.125 34 27.345
15 27.135 35 27.355
16 27.155 36 27.365
17 27.165 37 27.375
18 27.175 38 27.385
19 27.185 39 27.395
20 27.205 40 27.405
2-4. RF Power Output
zAM : 4.0 [W]
zFM : 4.0 [W]
2-5. DC Iinput Voltage and Current with 13.2V DC Input to Power AMP
zTransmitter Power Amp : Voltage 12.5 V
Current 820mA
zTransmitter Driver Amp : Voltage 12.5 V
Current 130 mA
2-6. Receiver IF and Local Oscillator Frequencies
zFirst IF : 10.695 [MHz]
zSecond IF : 455 [KHz]
zFirst Local Oscillator : 10.695 [MHz] Below Receiving Frequency
zSecond Local Oscillation : 10.240 [MHz]
TCB-660 Circuit Description Page 5
TTI 2007-02-2
3. Semiconductors and Function
3-1. Transistor
--------------------------------------------------------------------------------------------------------------------------------------------
Ref No. Description Manufacturer Function
--------------------------------------------------------------------------------------------------------------------------------------------
Q101 KTC3880S KEC RX Amplifier
Q102 KTK211 KEC 1’st Mixer
Q103 KTK211 KEC 1’st Mixer
Q104 KRC101S KEC RX Band1 Switching
Q105 KRC101S KEC RX Band2 Switching
Q151 KTC3875S KEC RX FM AF Amplifier
Q152 KRC112S KEC FM AF Mute at AM Mode
Q153 KRC101S KEC FM AF Mute at AM Mode
Q154 KRC112S KEC RX AF Mute at TX Mode
Q161 KTC3880S KEC AM IF Amplifier
Q162 KTC3880S KEC AM IF Amplifier
Q163 KRA102S KEC RX AM B+
Q164 KTA1504S KEC Automatic Noise Level Control
Q181 KTC3875S KEC RX RF Mute at TX Mode
Q182 KTC3875S KEC AGC
Q183 KTC3875S KEC AGC
Q201 KRC101S KEC AF Mute
Q202 KRC202S KEC AF Path
Q233 KTA1504S KEC Automatic Level Control
Q234 KTC3875S KEC Automatic Level Control
Q301 KTC3880S KEC VCO
Q302 KTC3880S KEC RX/TX VCO Buffer
Q303 KTC3880S KEC VCO Buffer
Q305 KRC101S KEC TX VCO Control
Q311 KRC101S KEC RX Band1 Switching
Q312 KRC101S KEC RX Band2 Switching
Q313 KRC101S KEC RX Band3 Switching
Q502 KTC3875S KEC FM TX AF Mute at AM TX
Q701 KTC3880S KEC TX Doublers
Q702 KTC3880S KEC TX Pre-Amplifier
Q703 KTC1006 KEC TX Driver Amplifier
Q704 2SC2078 SANYO TX Power Amplifier
Q742 KTC3875S KEC TX RF Mute at RX Mode
Q801 KRC101S KEC CPU Reset
Q802 KRC101S KEC CPU RX/TX Control
Q803 KRA101S KEC MIC Lock Control
Q911 KTA1658 KEC Main Regulator
Q912 KRA1504S KEC Main Regulator
Q913 KRC112S KEC Main Regulator Control
Q914 KRC102S KEC Power Low Control
Q921 KTC3875S KEC 8.2V Regulator
Q923 KTC3875S KEC RX B+
Q924 KRA1504S KEC TX B+
TCB-660 Circuit Description Page 6
TTI 2007-02-23
Q951 KTA1241 KEC Back Light LED Control
Q952 KTA1241 KEC Back Light LED Control
Q953 KRC101S KEC Back Light LED Control
Q954 KRC101S KEC Back Light LED Control
Q961 KRC110S KEC TX AF Mute at RX Mode
Q962 KRC111S KEC MIC AF Path at AM Mode
3-2. IC
--------------------------------------------------------------------------------------------------------------------------------------------
Ref No. Description Manufacturer Function
--------------------------------------------------------------------------------------------------------------------------------------------
IC101 TK144889V TOKO IF IC
IC102 KIA358F KEC AGC, Squelch Control
IC201 TDA2003 ST AF Power Amplifier
IC301 LC7152NM SANYO PLL
IC401 KIA4558F KEC FM TX AF
IC801 JT5BL9 TOSHIBA CPU
IC802 24WC02 ATMEL EEPROM
3-3. Manufacture Information
zKEC ---------------------- KEC Co., LTD.
zSANYO ---------------------- SANYO Semiconductor Co., LTD.
zTOKO ---------------------- TOKO, Inc.
zTOSHIBA ---------------------- Toshiba Semiconductor. Co., LTD.
zATMEL ---------------------- ATMEL Co., LTD
TCB-660 Circuit Description Page 7
TTI 2007-02-23
4. Description of Frequency Determining and Stabilizing Circuit
4-1. Introduction
The Frequencies for transmitter and receiver first local frequencies are all derived from a signal
4.5MHz crystal by means of a phase locked loop(PLL).
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 Q701, L701, L702 with doubles the frequency to generate 26.965MHz(CH1)
to 27.405MHz(40CH).
Q302
VCO Q701
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 Q102,
Q103.
4-2. Basic Synthesis Scheme
The crystal frequency(4.5MHz) is divided by 1800 times 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 9, 10 of IC301. Passing the phase detector output closes the feedback loop through
an active low pass filter and using the output to control the VCO frequency through varicap diode D301.
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 = 0.005 [MHz] OR Fvco = 0.005 X N [MHz]
Transmitter : 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 in receiver mode 5KHz and
transmitter mode 2.5KHz increments.
By suitable choice of “N” the desired output frequency can be obtained.
Channel 1 Channel 40
N Fvco N Fvco
Transmit 5393 13.4825 5481 13.7025
Receiver 3254 16.2700 3342 16.7100
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
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