Entel HX400 series Manuals

Manuals and User Guides for Entel HX400 series. We have 2 Entel HX400 series manuals available for free PDF download: Service Manual, Owner's Manual

Entel HX400 series Service Manual (80 pages)

VHF/UHF Handheld Transceiver

Brand: Entel | Category: Transceiver | Size: 5 MB

Table of Contents
2
Introduction
5
Model Numbers
5
Items Supplied
5
Accessories
6
Operating the Radio
7
Theory of Operation
7
The Microprocessor
7
Microprocessor I/O Signals
8
Switch Operation
9
Backlights
9
Microprocessor Clock and Beat Shift Function
9
Microprocessor Reset
9
Discrete Control Signals
10
Audio and Tone Signalling Circuits
11
Received Voice Audio Processing
11
Received Tone Processing
12
Transmit Audio Processing
12
Transmit Tone Processing
13
Synthesizer Section
14
Reference Oscillator
14
Figure 4.1 Synthesizer Block Diagram
14
Voltage Doubler
15
Loop Filter
15
Transmit VCO
15
Receive VCO
15
VCO Power Switching and Buffering
16
Receiver Section
17
Antenna Transmit/Receive Switching Circuit
17
First RF Filter
17
RF Amplifier
17
Figure 4.2 Receiver Block Diagram
17
Second RF Filter
18
Mixer Circuit
18
First if Filter
18
First if Amplifier Circuit
18
Second lo Tripler Circuit
18
Second if Circuit (FM if IC)
19
Noise Squelch Detector
19
Transmitter Section
21
Low Power Transmit Amplifier
21
Transmit Driver Amplifier
21
Final Power Amplifier
21
PA Switching Circuit
22
Power Supply
23
Battery Connections and Protection Circuit
23
Main Regulator
23
Transmit and Receive Power Control Circuit
23
Miscellaneous Functions
23
Switches
23
Indicators
23
Volume Control
24
Battery Monitoring
24
Disassembly
25
Attaching and Removing the Battery Pack
25
Disassembling the Radio
25
Figure 5.1 Exploded View
25
Reassembling the Radio
26
Visual and Mechanical Inspection
26
Testing and Programming Setup
28
Figure 6.1 Test & Programming Setup
28
Specifications
29
Figure 7.1 Specifications
29
Parts Lists
30
Controller and Processor Pec Parts List
30
Xvhf Models
34
Xuhf Models
40
Rf Pec Parts List - Hx41 X 66-88Mhz Models
45
Odels
52
Odels
53
Circuit Diagrams
56
Figure 9.2 Controller and Processor PEC Circuit Diagram Sheet 2 - All Models
56
Figure 9.4 RF PEC Block Diagram - All Models
56
Figure 9.5 Synthesiser Circuit Diagram - VHF Models
56
Figure 9.6 VCO Circuit Diagram - VHF Models
56
Figure 9.7 Receiver Circuit Diagram - VHF Models
56
Figure 9.8 Transmitter Circuit Diagram - VHF Models
56
Figure 9.9 Synthesiser Circuit Diagram - UHF Models
56
Figure 9.10 VCO Circuit Diagram - UHF Models
56
Figure 9.11 Receiver Circuit Diagram - UHF Models
56
Figure 9.24 Hx4Xx Control Board, BOTTOM VIEW
80

Entel HX400 series Owner's Manual (14 pages)

vhf/uhf handheld

Brand: Entel | Category: Transceiver | Size: 2 MB

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Entel HX400 series Service Manual (80 pages)

Table of Contents

Entel HX400 series Owner's Manual (14 pages)

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