TTI TCB-1100 Service Manual
SERVICE MANUAL
TCB-1100
MULTI CHANNEL AM/FM TRANSCEIVER
TTI Tech Co.,Ltd.
Downloaded from www.cbradio.nl
TABLE OF CONTENTS
SECTION 1
SECTION 2
2-1
2-2
2-3
2-4
2-5
SECTION 3
SECTION 4
SECTION 5
5-1
5-2
5-3
5-4
5-5
5-6
SECTION 6
SECTION 7
SPECIFICATIONS
CIRCUIT DESCRIPTION
GENERAL
TECHNICAL DESCRIPTION
SEMICONDUCTORS AND FUNCTION
DESCRIPTION OF FREQUENCY DETERMINING AND STABILIZING CIRCUIT
TEST EQUIPMENT SETUP AND ALIGNMENT INSTRUCTIONS
PART LIST
MECHANICAL DISASSEMBLY
BOARD LAYOUT
MAIN PCB
LCD PCB
LED PCB
VOLUME PCB
SQUELCH PCB
CHANNEL PCB
BLOCK DIAGRAM
SCHEMATIC
General
Channel
Frequency Range
Operating mode
Frequency Control
Frequency Tolerance
Operating Temperature
Range
Microphone
Input Voltage
Size
Weight
Power Output
Modulation
Frequency Response
Output Impedance
Harmonic Suppression
Current Drain
40 (See the frequency band
chart)
26.96 MHz ~ 27.99125 MHz
F3E (FM), A3E (AM)
PLL Synthesizer
0.002%
-10 to + 55 C
Plug-in Type
13.2V DC 15%
190(W) x 165(L) x 58(H)
978.5 g
Duty cycle 10% 4 Watts @13.8V
DC
AM:from 85% to 95%
FM:1.8KHz to +2.0KHz
300Hz to 3000Hz
50ohms, Unbalanced
Less than -36dBm
Receiving System
IF Frequencies
Sensitivity
Audio Output Power
Audio Distortion
Image Rejection
Adjacent Channel Rejection
Conducted Spurious
Frequency Response
Built-in Speaker
Transmitter
Receiver
Dual conversion superheterodyne
Double Conversion 1st 10.695MHz/2nd 455KHz
0.7 V for 10dB(S+N)/N in AM Mode
0.7 V for 20dB SINAD in FM Mode
2.0W @ 8 Ohm
Less then 8% @ 1KHz
60 dB
60 dB
Less than -57dBm
300 to 2500Hz
8 Ohms, round
Adjustable; Threshold less than 1 microvolt
DSS; Less than 2 microvolt
Transmitter
General
SECTION 1. SPECIFICATIONS
SECTION 2. CIRCUIT DESCRIPTION
------------ Contents -------------
1 General
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. Introductio
n
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 Buffer Amp
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 Test Procedure with Alignment Instructions
5-1. General Section.
5-1-2 Test Procedure with Alignment
5-2.
T ransmitter Section
5-2-2. Test Procedure and Alignment at TX
5-3. Receiver Section
5-3-2 Test Procedure and Alignment at RX
TCB- 1100 Circuit Description Page 2
1. General
1-1. Receiver
① Display : 40 Channels and other functions indication
② Frequency Range : 26.965 to 27.405 [MHz]
③ Frequency Response : 300 to 2,500 [Hz]
④ Power Source : 13.2 [V] DC
⑤ Audio Output Load : 8 [OHM]
⑥ Audio Output : 4.0 [W] (or More)
⑦ Squelch : Adjustable from 0.2[uV] to 100 [uV]
⑧ Sensitivity :
- 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
⑨ Intermediate Frequency :
- 1st IF : 10.695 [MHz]
- 2nd IF : 455 [KHz]
1-2. Transmitter
① Carrier Power(Conducted)
② Current Drain ( 13.2 [V] Supply Voltage)
- No Modulation : 1,100 [mA]
- Max Modulation : 1
③ Modulation Capabilities
- AM : ± 90 [%]
- FM : ± 1.8 [KHz/Dev]
④ Spurious Radiation : Less then -54 [dBm]
⑤ Antenna Impedance : 50 [OHM]
⑥ Frequency Tolerance : 0.002 [%]
: AM 4 [W] / FM 4 [W]
,600 [mA]
TTI 2009-02-20
TCB-1100 Circuit Description Page 3
2. Technical Description
2-1. General
2-2. Type of emission : AM(A3E) , FM(F3E)
Model TCB-1100 is an mobile type AM/FM radio transceiver for use of the Citizen Radio Service.
z Front Panel Controls
(1) LCD (Channel and RX/TX
(2) Receiver Audio Control Volume (With Power ON/OFF Control)
(3) Squelch Control Volume (With DSS ON/OFF Control)
(4) Channel UP/Down Rotary Switch
(5) CH9 Select Key / Menu Key
(6)
Scan Key / S.MEM Key
(7) DW Key / Vox Key
(8) Comp Key / Tone Key
(9) Back Light Select Key / Lock Key
(10) AM,FM Key / M Key
z Accessorily Connectors
(1) Antenna Socket
(2) External Speaker Jack (3.5mm)
(3) External S-meter Jack (2.5 mm)
(4) Microphone Connector (6 pin)
).
TTI 2009-02-20
TCB-1100 Circuit Description Page 4
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
z AM : 4.0 [W]
z FM : 4.0 [W]
2-5. DC Iinput Voltage and Current with 13.2V DC Input to Power AMP
z Transmitter Power Amp : Voltage 12.0 V
z Transmitter Driver Amp : Voltage 12.0 V
2-6. Receiver IF and Local Oscillator Frequencies
z First IF : 10.695 [MHz]
z Second IF : 455 [KHz]
z First Local Oscillator : 10.695 [MHz] Upper Receiving Frequency
z Second Local Oscillation : 10.240 [MHz]
Current 900 mA
Current 130 mA
TTI 2009-02-20
TCB-1100 Circuit Description Page 5
3. Semiconductors and Function
3-1. Transistor
--------------------------------------------------------------------------------------------------------------------------------------------
Ref No. Description Manufacturer Function
--------------------------------------------------------------------------------------------------------------------------------------------
Q101 2SC4226 NEC RX Amplifier
Q102 KTK211 KEC 1’st Mixer
Q103 KTK211 KEC 1’st Mixer
Q107 KTC3875S KEC RX,RF/Mute,at-TX
Q108 KTC3875S KEC AGC
Q109 KTC3875S KEC AGC
Q110 KRC112S KEC S-Meter Dectector
Q112 KRC112S KEC FM AF Mute at AM Mode
Q118 KRC111S KEC RX AF Mute at TX Mode
Q114 KTC3880S KEC AM IF Amplifier
Q115 KTC3880S KEC AM IF Amplifier
Q113 KRA101S KEC RX AM(B+)switch
Q116 KTA1504S KEC Automatic Noise Level Control
Q111 KTC3875S KEC RX FM AF Amp
Q121 KTC1241 KEC TX,AM/1W-SW
Q132 KRC111S KEC TX,AM-AF,SW
Q201 KRC101S KEC AF Mute
Q117 KRC111S KEC AF Path
Q120 KTA1504S KEC Automatic Level Control
Q119 KTC3875S KEC Automatic Level Control
Q128 2SC4226 NEC VCO
Q129 KTC3880S KEC RX/TX VCO Buffer
Q130 KTC3880S KEC VCO Buffer
Q127 KRC101S KEC TX VCO Control
Q133 KRC111S KEC TX,Call Switching
Q125 KRC101S KEC TX Band2 Switching
Q155 KRC111S KEC TX,Mode Switching
Q146 KTC3875S KEC FM TX AF Mute at AM TX
Q134 KTC3880S KEC TX,Buffer
Q135 KTC3880S KEC TX Pre-Amplifier
Q136 2SC2314F SANYO TX Driver Amplifier
Q138 RD16HHF1 Mitsubishi TX Power Amplifier
Q153 KTA101S KEC TX SW
Q8 KRC404 KEC CPU Reset
Q152 KRC101S KEC RX/TX Control
Q154 KRA101S KEC TX,SW
Q122 KRC101S KEC FM,AM,Switch
Q154 KRA101S KEC TX,Switch
Q151 KRC111S KEC AM/FM,SW
Q145 KRC102S KEC Power Low Control
Q143 KTC3875S KEC 8.2V Regulator
Q142 KTC3875S KEC RX B+
Q141 KRA1504S KEC TX,B+
Q144 KTC3875S KEC
Q147 KRC111S KEC TX,Call-SW
5V.Regulator
TTI 2009-02-20
TCB-1100 Circuit Description Page 6
Q1 KTA1505S KEC Back-Light,LED-Control
Q2 KRC101S KEC Back-Light,LED-Control
Q3 KRC101S KEC Back Light LED Control
Q4 KRC101S KEC Back Light LED Control
Q5 KRC110S KEC Back Light,LED Control
3-2. IC
--------------------------------------------------------------------------------------------------------------------------------------------
Ref No. Description Manufacturer Function
--------------------------------------------------------------------------------------------------------------------------------------------
IC1 SL5019 AUK IF IC
IC2 KIA358F KEC AGC, Squelch Control
IC3 TDA2003 ST AF Power Amplifier
IC4 LC7152NM SANYO PLL
IC5 KIA4558F KEC FM TX AF
IC8 CMX138 CML Tone.IC
IC10 4094B Rohm Shift,Resistor
IC11 KIA2576 KEC Switchlng,Power-Supply
IC12 H8/38124 Renesas CPU
IC13 AT24C16 ATMEL EEPROM
IC14 KIA324 KEC Auto-SQ,Amp(DSS)
3-3. Manufacture Information
z KEC ---------------------- KEC Co., LTD.
z SANYO ---------------------- SANYO Semiconductor Co., LTD.
z TOKO ---------------------- TOKO, Inc.
z TOSHIBA ---------------------- Toshiba Semiconductor. Co., LTD.
z ATMEL ----------------------
* NEC ----------------------- NEC Semiconductor
* AUK ----------------------- AUK Semiconductor
* Rohm ----------------------- Rohm Co.,Ltd
* Renesas ----------------------- Renesas Tech Nology Corp.
ATMEL Co., LTD
TTI 2009-02-20
TCB-1100 Circuit Description Page 7
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 37.660MHz(CH1) to 38.10MHz(CH40). The second local
frequency is fixed at 10.240MHz to generate second IF 455KHz.
Transmit, the VCO of the PLL operates 26.965MHz(CH1) to 27.405MHz(40CH). The VCO frequency
goes to the Buffer Amp circuit Q134, L701.
Q128
VCO
26.965MHz(CH1)
~
27.405MHz(CH40)
The VCO operating frequency for the receiver is 37.66MHz(CH1) to 38.10MHz(CH40) as the
first local oscillator, injected through the buffer amplifier Q129 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 IC4. 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 D112.
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 = 0.005 [MHz] OR Fvco = 0.005 X N [MHz]
Since “N” is an integer, the VCO frequency can be stepped up with in receiver mode 5KHz and
transmitter mode 5KHz increments.
By suitable choice of “N” the desired output frequency can be obtained.
27.405MHz(CH40)
Q134
Buffer
26.965MHz(CH1)
To transmitter
~
Channel 1 Channel 40
N Fvco N Fvco
Transmit 5393 26.965 5481 27.405
Receiver 7532 37.660 7620 38.100
The VCO frequency goes to the Buffer Amp circuit,
VCO Output Frequency Buffer Output Frequency
TTI 2009-02-20
TCB-1100 Circuit Description Page 8
Transmit
---
---
---
Transmit
Since all frequencies are obtained from the crystal controlled PLL oscillator, all outputs are
coherent with the crystal oscillator frequency and matching the sample percentage accuracy.
Note that the reference frequency of 5KHz, receiver and transmitter is obtained by
dividing the 4.5MHz by 900 times and 1800 times
CH 1 , 26.965 MHz
CH 40 , 27.405 MHz
26.965 MHz
27.405 MHz
TTI 2009-02-20
TCB-1100 Circuit Description Page 9
4-3. Descriptions of Each Block
4-3-1. Introduction
The synthesizer is implemented with the following components;
PLL IC (IC4)
X-TAL (X102)
VCO, VARICAP DIODE (D112)
IC4 is CMOS LSI that includes most of PLL block.
The Q128, L301, C232, C242, C243, C244, varicap diode D112 are clap oscillator circuit to
operate as a VCO of the IC4. Q127 is a switching transistor to connect or disconnect the tuning
capacitor in the VCO oscillator tank circuit for transmitter or receiver.
Q129 works as a buffer amplifier for RX local frequencies (≒37MHz) and TX carrier
generating frequencies(≒26MHz)
4-3-2. Reference Frequency
The crystal X102(4.5MHz) and other components at Pin 1 and 24 of IC4 can make a reference
frequency oscillator with internal amplifier.
4-3-3. VCO
Q128 and surrounding parts are consisting a clap oscillator works as a VCO of IC4. With
appropriate control voltage on D112 the VCO can be oscillate over the required range of 26.965MHz to
38.10MHz.
4-3-4. Programmable Divider and Its Control
The programmable input for each channel are stetted by the PLL Clock(Pin 56), PLL Data(Pin
55), PLL Enable(Pin 58) of IC12. Each input signal to control the PLL ic is done with provide key input
Pin 73, 74, 75. For each key input, an internal code converts EEPROM
appropriate control to the programmable divider for that channel.
Since the change transmit and receive, and additional bit is required at Pin 66 of IC12 to allow
the ROM to recognize the status TX or RX.
During transmit the push to talk switch makes Pin 66 ground, PLL IC works
under transmit status.
The programmable divider output fed to the phase detector for compare with the 5KHz
reference frequency IC4. See table 1 for actual input and divide ratio on all channels.
4-3-5. Phase Detector and VCO Control
The phase detector is a digital phase comparator witch compares the phase of the reference
signal with programmable divider output square waves and develops a series of pulses whose dc level
depends on the phase error of each signal.
The phase detector pulse output is fed to an active low pass filter and RC low pass filter output
signal of IC4 is filtered and fed to varicap D112 control the VCO frequency.
4-3-6. Transmitter / Receiver Buffer AMP
Output signal of Q128 is fed into the buffer amplifier Q129, L3 to generate TX carrier
frequency and 1’st local frequencies.
TTI 2009-02-20
TCB-1100 Circuit Description Page 10
4-3-7. Transmitter Buffer
The output signal of Q129, L3 goes to an amplifier with tuning circuit Q134, L701,
which buffer incoming 26MHz signals.
4-3-8. Switching of Turning Capacitor in VCO
The VCO circuit must tune with a wide range of frequencies 26.965MHz ~ 27.405MHz for
transmitter and 37.66MHz ~38.10MHz for receiver.
To comply above range of VCO, the tuning capacitance should switch for transmission. The
tuning circuit consists with L301, C232, C242, C243, and C244. When the VCO is working as a receiver
Q127 becomes turn OFF. So, L301 and C232, D112 makes turning function.
When transmitting, Q127 becomes ON. S the o, L301 an parallel capacitance of C232 and C241
make turning function.
4-3-9. Receiver Local Oscillator Outputs
z FIRST MIXER :
The secondary output signal of L107 is injected to the sources of 1’st mixer Q102, Q103 in the
1’st IF mixer section.
z SECOND MIXER :
The output of 10.24MHz oscillator circuit with X101 is injected into the IF IC(IC1) internally.
Incoming IF signal and 10.24MHz signal are mixed inside the IF IC to extract 2’nd IF signal 455KHz.
FM audio Signals are recovered with the way of quadrature detector.
AM signals are recovered with envelope detector.
4-4. Frequency Stability
Let : Fo = Crystal oscillator frequency
Fr = Phase detector reference frequency
Fvco = VCO frequency
Ft = Transmit frequency
Then : Receiver : Fr = Fo/900
Transmitter : Fr = Fo/900
And under locked conditions : Fr = Fvco / N
Where, “N” is the programmable divider divide ratio.
Then : Fvco = N X Fr)
From which it can be seen, the percentage error in Ft is the same as the percentage error in Fo.
The stability of the crystal oscillator is determined primarily by the crystal itself and having lesser
deviation by the active and passive components of the oscillator. The choice of crystal and components is
such that the required frequency stability is maintained over the required voltage and temperature range.
TTI 2009-02-20
Loading...