Sign In
Upload
Manuals
Brands
Realistic Manuals
Transceiver
HTX-404
Realistic HTX-404 Manuals
Manuals and User Guides for Realistic HTX-404. We have
2
Realistic HTX-404 manuals available for free PDF download: Service Manual, Owner's Manual
Realistic HTX-404 Service Manual (67 pages)
70 CM Amateur UHF-FM transceiver
Brand:
Realistic
| Category:
Transceiver
| Size: 3.48 MB
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
66
Advertisement
Realistic HTX-404 Owner's Manual (28 pages)
440 MHz (70 CM) Amateur UHF FM Transceiver
Brand:
Realistic
| Category:
Transceiver
| Size: 1.72 MB
Table of Contents
Features
2
Contents
2
Manual Conventions
3
Introduction
4
Preparation
6
Power Sources
6
Operating from the Rechargeable Power Pack
6
Using Alkaline Batteries
6
Operating from Vehicle Battery Power
7
Operating from AC Power
7
Backup Battery
8
Connecting the Antenna
9
Activating Additional Frequencies
9
Attaching the Belt Clip
9
Attaching the Hand Strap
9
Using an External Microphone
10
Using an External Speaker
10
Using the HTX-404 with Packet Radio
10
Using the Light
10
Basic Operation
11
Setting Squelch and Volume
11
Selecting a Frequency
11
Tuning Using Direct Entry
11
Receiving Transmissions
12
Transmitting
12
Locking the Keypad
13
Setting the Key Entry Beep
13
Reversing the Offset
13
Using Memory Channels
13
Using the Calling-Frequency Memory
14
Using the Priority-Frequency Memories
14
Reviewing Programmed Options
15
Using the Standard Memories
15
Clearing Memories
15
Moving a Memory Channel to the Manual Mode
15
Advanced Operation
16
Configuration Menu
16
Duplex Separation Default
16
Tone-Coded Squelch
17
Scan Options
17
Frequency Step Rate
17
Scan Resume Condition
17
Power-Saving Feature
18
Preventing Transmissions
18
Scan Delay Duration
18
Scan Limits
18
Limiting Transmission Duration
19
Setting the Priority Scan Time
19
Using Touch-Tone Features
19
Manually Sending Touch Tones
19
Error Codes
20
Transmitting a DTMF Memory Sequence
20
Using DTMF Squelch for Paging
20
Automatically Sending a DTMF Reply
20
Care and Maintenance
21
Specifications
21
Digital Schematic
23
RF Schematic
24
Key Index
25
Advertisement
Related Products
Realistic HTX-202 99-1120
Realistic HTX-100
Realistic 19-11 01
Realistic 21-139
Realistic 21-141
Realistic TRC- 9A/1 1
Realistic TRC-11
Realistic TRC-30A
Realistic TRC-410
Realistic TRC-411
Realistic Categories
Transceiver
Scanner
Receiver
Radio
Stereo Receiver
More Realistic Manuals
Login
Sign In
OR
Sign in with Facebook
Sign in with Google
Upload manual
Upload from disk
Upload from URL