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HTX-202 99-1120
Realistic HTX-202 99-1120 User Manual
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2
Table of Contents
Contents
1
Specifications
2
Disassembly Instructions
4
Block Diagram
7
Theory of Operation
11
Transmitter
11
Microphone Audio Circuit
11
Automatic Power Control
11
Frequency Synthesizer Circuit
12
RX and TX Voltage Controlled Oscillator Module
12
RX and TX Power Line Filter
12
Tx Vco
12
Programmable Dividers
13
Phase Detector
13
Out of Lock Detector
13
Prescaler
13
Microprocessor Controller
14
Second Mixer, Second if and FM Detector
14
Receiver Audio Circuit
14
High Pass Filter Module
14
Power Switching Circuit
15
CTCSS/DTMF Encode and Decode Circuit
15
CTCSS Receive
15
CTCSS Transmit
15
Control and Indicator Circuit
16
External PTT Control Circuit
16
Channel Select Circuit
16
Signal Level Indicator
16
Alignment Instructions
17
Alignment Test Point and Parts Locations
17
Phase Locked Loop and CPU Section
18
Transmitter Section
19
Test Equipment Required
19
Alignment Procedure
19
Receiver Section
21
Troubleshooting Hints
22
Error Display
23
Internal RAM Error
23
PLL Unlock Error
23
Wiring Diagram
24
Printed Circuit Board Views
25
Rf Pcb
25
Top View
25
Bottom View
26
Chip Component Side View
27
Keypad Side View
28
High Press Filter PCB
30
Auto Power Control PCB
31
Ptt Pcb
31
Top PCB
32
Audio PCB
33
Level PCB
33
Vco Pcb
34
Flexible PCB
35
Exploded View
36
Exploded View Parts List
37
Electrical Parts List
40
Semiconductor Voltage Chart
55
Normal Function
55
Transistor
55
Diode
55
Tone Squelch Function
56
DTMF Squelch Function
57
IC/Ptt Pcb
57
Back Light Function
58
Sub Board PCB
58
Semiconductor Lead Identification
59
IC Internal Connection
63
Schematic Diagram
69
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Realistic HTX-202 99-1120 Specifications
General
Brand
Realistic
Model
HTX-202 99-1120
Category
Transceiver
Language
English
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