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Realistic Manuals
Transceiver
HTX-404
Service manual
Table Of Contents - Realistic HTX-404 Service Manual
70 cm amateur uhf-fm transceiver
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:
Owner's manual
(28 pages)
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Table Of Contents
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
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Table of Contents
Contents
1
Specifications
2
Disassembly
4
Block Diagram
6
Theory Of Operation
7
Transmitter
7
Microphone Audio Circuit
7
Automatic Power Control
7
Rx Vco
8
Tx Vco
8
Loop Filter
8
Pll Frequency Synthesizer
8
Programmable Dividers
9
Phase Detector
9
Receiver
9
Rf Amplifier
9
Microprocessor Controller
10
Receiver Audio Circuit
10
High-Pass Filter Module
10
Audio Amplifier Module
10
Power Switching Circuit
11
Ctcss Receive
11
Ctcss Transmit
11
Dtmf Decoding Circuit
11
Control And Indicator Circuit
12
External Ptt Control Circuit
12
Channel Select Circuit
12
Squelch Level Indicator
12
Alignment
13
Alignment Test Point And Parts Lcoations
13
Phase Locked Loop And Cpu Section
14
Transmitter Section
15
Receiver Section
17
Troubleshooting Hints
18
Error Display
19
Internal Ram Error
19
Pll Unlock Error
19
Wiring Diagram
20
Printed Circuit Boards
21
Rf Pcb: Top View
21
Rf Pcbl Bottom View
22
Chip Component Side View
23
Keypad Side View
24
High Press Filter Pcb
26
Top View
26
Bottom View
26
Mic Pcb
26
Auto Power Control Pcb
27
Ptt Pcb
27
Top Pcb
28
Audio Pcb
29
Vco Pcb
30
Flexible Pcb
31
Exploded View
32
Exploded View Parts List
33
Electrical Parts List
37
Semiconductor Voltage Chart
50
Tone Squelch Function
51
Dtmf Squelch Function
52
Diode
52
Ic/Ptt Pcb
52
Back Light Function
53
Sub Board Pcb
53
Semiconductor Lead Identification
54
Ic Internal Connection
58
Schematic Diagrams
65
End Of Document
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