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TRC-449
Realistic TRC-449 Service Manual
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J?<EALIShc
-
ervlce
TRC-449
CB
TRANSCEIVER
Catalog
Number:
21-1562
~
CUSTOM
MANUFACTURED
FOR
RADIO
SHACK
M
A
DIVISION
OF
TANDY
CORPORATION
2
Table of Contents
Table of Contents
2
General
3
Measurement Condition
3
Specifications
3
Disassembly Instructions
6
To Remove Front Panel
6
To Remove Top & Bottom Cover
6
Block Diagram
7
Alignment Instructions
8
Alignment Points
8
Chassis Layout
8
Alignment of PLL and Carrier Oscillator
9
PLL and Carrier Oscillator Test Equipment Setup
9
Test Equipment Required
9
PLL Circuit Description
10
Wave Form of IC7
10
Channel Selection Program
11
PLL Local Oscillator
11
Transmitting Frequency Calculation
11
Frequency Chart
12
Audio Limiter
13
Audio Limiter and Automatic Modulation Control
13
Automatic Limiter Circuit
13
Automatic Modulation Control
13
N.B. AGC Circuit
14
Noise Amplifier Circuit
14
Noise Blanker Circuit
14
Alignment of Transmitter Section
15
Transmitter Test Equipments Setup
15
Receiver Test Equipment Setup
16
No Noise
17
No Receive Sound
17
Troubleshooting Hints
17
Unit will Not Turn on
17
No am Modulation
18
No LED Channel Indicator Lights
18
No Noise Blanker Operates
18
No Transmission
18
Pll CI Rcuit Troubleshooting Hints
19
IC Transistor & Diode Lead Identifications
20
IC & Compound Parts Internal Diagrams
21
Channel Switch P.C. Board (Flexible)
22
Noise Blanker P.C. Board
22
Speaker Jack P.C. Board (Top & Bottom)
22
Main P.C. Board (Top View)
23
MAIN P.C. BOARD (BOTTOM View)
24
Additional Parts on the Bottom
25
Wiring Diagram
26
Electrical Parts List
29
Mechanical Parts List
43
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Owner's Manual
20 pages
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Realistic TRC-449 Specifications
General
Frequency Range
26.965 - 27.405 MHz
Modulation
AM
Power Output
4 Watts
Channels
40
Microphone
Dynamic
Antenna Impedance
50 Ohms
Type
CB Radio
Mode
AM
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