tcb-880 service manual.pdf

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SERVICE
MANUAL
MULTI CHANNEL AM/FM TRANSCEIVER
TCB-880
TTI Tech
TABLE OF CONTENTS
SECTION
SECTION
1
2
1
2
3
4
5
SECTION
SECTION
SECTION
3
4
5
5-1
5-2
5-3
5-4
5-5
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
FRONT PCB
LED PCB
VOLUME PCB
MIC PCB
SECTION
SECTION
6
7
BLOCK DIAGRAM
SCHEMATIC
SECTION1
SPECIFICATIONS
40 (See the frequency band chart)
26.96 MHz ~ 27.99125 MHz
F3E (FM), A3E (AM)
G
PLL Synthersizer
E
0.002%
N
E
-10 to + 55 C
R
Plug-in Type
A
13.2V DC ± 15%
L
156 (W) x 176 (L) x 51(H)
990 g
SO-239 type
T
Duty cycle 10% 4 Watts @13.8V DC
R
AM:from 85% to 95%
A
N
FM:1.8KHz ± 0.2KHz
S
M
Frequency Response 300Hz to 3000Hz
I
50ohms, Unbalanced
T
Output Impedance
T
Harmonic Suppression More than -36dBm
E
AM Full Mod. 1.6A Max.
R
Current Drain
Receiving System
Dual conversion superheterodyne
IF Frequencies
Double Conversion 1st 10.695MHz/2nd 455KHz
Sensitivity
0.7 V for 10dB(S+N)/N in AM Mode
R
0.5 V for 20dB SINAD in FM Mode
E
C
Audio Output Power 2.0W @ 8 Ohm
Less then 8% @ 1KHz
E
Audio Distortion
I
Image Rejection
60 dB
V
Adjacent Channel Rejection 60 dB
E
R
Conducted Spurious More than 60 dB
Frequency Response 300 to 2500Hz
Built-in Speaker
8 Ohms, round
Squelch
Adjustable; Threshold less than 1 microvolt
* Specification is subject to change without prior notice.
Channel
Frequency Range
Operating mode
Frequency Control
Frequency Tolerance
Operating Temperature Range
Microphone
Input Voltage
Size
Weight
Antenna Connector
Power Output
Modulation
SECTION2
CIRCUIT DESCRIPTION
------------ Contents -------------
1
1-1.
1.2.
2.
2-1.
2-2.
2-3.
2-4.
2-5.
2-6.
3.
4.
4-1.
4-2.
4-3.
4-3-1.
4-3-2.
4-3-3.
4-3-4.
4-3-5
4-3-6.
4-3-7.
4-3-8.
4-3-9.
4-4.
4-5.
4-5-1.
4-5-2.
5.
5-1.
5-2.
5-3.
General
Receiver
Transmitter
Technical Description
General
Type of emission
Frequency Table
RF Power Output
DC input Voltage and Current with 13.2V DC Input to Power AMP
Receiver IF and Local Oscillator Frequencies
Semiconductors and Function
Description of Frequency Determining and Stabilizing Circuit
Introduction
Basic Synthesis Scheme
Descriptions of Each Block
Introduction
Reference Frequency
VCO
Programmable Divider and its Control
Phase Detector and VCO Control
Transmitter / Receiver Buffer AMP
Transmitter Doublers
Switching of Turning Capacitor in VCO
Receiver Local Oscillator Outputs
Frequency Stability
Description of other Circuits
Transmitter
Receiver
Test Equipment Setup and Alignment Instructions
General Section
Transmitter Section
Receiver Section
1.
1-1.
①
②
③
④
⑤
⑥
⑦
⑧
General
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]
Audio Output : 4.0 [W] (or More)
Squelch : Adjustable from 0.3[uV] to 100 [uV]
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
Intermediate Frequency :
- 1st IF : 10.695 [MHz]
- 2nd IF : 455 [KHz]
Transmitter
Carrier Power(Conducted) : AM 1 [W] / FM 4 [W]
Current Drain ( 13.2 [V] Supply Voltage)
- No Modulation : 1,000 [mA]
- Max Modulation : 1,400 [mA]
Modulation Capabilities
- AM :
±
90 [%]
- FM :
±
1.8 [KHz/Dev]
Spurious Radiation : Less then 74 [dBc]
Antenna Impedance : 50 [OHM]
Frequency Tolerance : 0.002 [%]
⑨
1-2.
①
②
③
④
⑤
⑥

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