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Kenwood Manuals
Two-Way Radio
TH-78A
Service manual
Table Of Contents - Kenwood TH-78A Service Manual
144/430 (440) mhz fm dual bander
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Also See for TH-78A
:
Instruction manual
(72 pages)
,
Instructions
(4 pages)
,
Instruction manual
(52 pages)
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Table Of Contents
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Table of Contents
Contents
1
Circuit Description
2
Frequency Configuration
2
Receiver System
3
Vhf Receiver
3
Rx Selection Block Diagram
3
Sub Vhf Receiver
4
Uhf Receiver
4
Sub Uhf Receiver
4
Audio Circuits
4
Receiver Audio Signals Switching
5
Rx Audio Switching Circuit
5
External Speaker Detection
6
Audio Amplifier
6
Squelch Circuit
6
S Meter Circuit
6
Transmitter System
7
Modulator Circuit
7
88.5 Hz Lpf
7
Driver And Final Amplifier
7
Apc Circuit
8
Power Supply Circuit
9
Save Circuit
9
Pll Circuit
10
Pll
10
Vco-V
10
Vco-U
10
Unlock Detection Circuit
11
Led Drive Circuit
11
Remote Control Microphone Circuit
11
Microcomputers And Peripheral Circuits
12
Reset And Backup Circuits
12
Dtmf And Dtss/Paging
13
Dtmf Encode
13
Dtmf Decode
13
Dtmf Decode Timing
13
Ctcss Operation
14
Speaker, Microphone, Remote Circuit
14
Description Of Components
15
Control Unit
15
Tx-Rx Unit
16
Semiconductor Data
21
Block Diagram
21
Pin Functions
23
Pin Layout
23
Uhf Power Module
24
Maximum Rating
24
Electrical Characteristics
24
Microcomputer
25
Pin Connection
25
I/O Port Specifiations
26
Parts List
33
Disassembly
54
Adjustment
57
Required Test Equipment
57
Preparation
57
Th-78 Adjustment
58
Adjustment Point
62
Wiring Diagram
64
Unit Boards
65
Level Diagram
99
Terminal Functions
101
Battery Case
103
Head Set With Vox & Ptt
104
Extension Memory Unit
106
Dc Cord
107
Plug With Cord
107
Sc-35 External View
108
Sc-36 External View
108
Mb-6 External View
108
Wr-2 External View
108
Smc-31 External View
109
Smc-32 External View
109
Smc-31 Specifications
109
Smc-32 Specficiations
109
Smc-33 Specifications
110
Hs-9 External View
110
Tsu-7 Pc Board View
111
Tsu-7 Parts List
111
Pc Board Views
112
Circuit Diagram
112
Specifications
113
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