TCB-770 service manua, CB Radio, Instrukcje
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SERVICE
MULTI CHANNEL AM/FM TRANSCEIVER
TCB-770
MANUAL
TABLE OF CONTENTS
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
3 PART LIST
SECTION
4 MECHANICAL DISASSEMBLY
SECTION 5 BOARD LAYOUT
5-1 MAIN PCB
5-2
FRONT PCB
5-3 LED PCB
5-4 VOLUME PCB
5-5 MIC PCB
SECTION 6 BLOCK DIAGRAM
SECTION 7 SCHEMATIC
SECTION1 SPECIFICATIONS
Channel
Frequency Range
Operating mode
Frequency Control
Frequency Tolerance
Operating Temperature Range
Microphone
Input Voltage
Size
Weight
Antenna Connector
Power Output
Modulation
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 @13.8V 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
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
SECTION2 CIRCUIT DESCRIPTION
------------ Contents -------------
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
4-1.
Description of Frequency Determining and Stabilizing Circuit
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.
5-1. General Section
5-2. Transmitter Section
5-3. Receiver Section
Test Equipment Setup and Alignment Instructions
1
General
4.
Introduction
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]
ˠ
Power Source : 13.2 [V] DC
ˡ
Audio Output Load : 8 [OHM]
ˢ
Audio Output : 4.0 [W] (or More)
ˣ
Squelch : Adjustable from 0.3[uV] to 100 [uV]
ˤ
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]
1-2. 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]
ˠ
Spurious Radiation : Less then 72 [dBc]
ˡ
Antenna Impedance : 50 [OHM]
ˢ
Frequency Tolerance : 0.002 [%]
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