Abell A720T Manuals

Abell A720T Manuals

Manuals and User Guides for Abell A720T. We have 2 Abell A720T manuals available for free PDF download: Service Manual, Instruction Manual

Abell A720T Service Manual

Abell A720T Service Manual (56 pages)

Brand: Abell | Category: Radio | Size: 2 MB

Table of Contents

Table of Contents
2
Chapter 1 Introduction

4
- Scope of Application
  4
- Security Issues
  4
Chapter 2 Structure and Key Functions

5
- Structure
  5
Chapter 3 Composite Mode

7
- Mode
  7
- How to Enter each Mode
  7
- Pc Mode
  7
- Preface
  7
- Connection Steps
  7
Chapter 4 Disassembled Parts in Maintenance Process

9
- Disassemble the Radio
  9
- Explosive View
  10
Chapter 5 Unit Circuit

11
- Dmr Digital Circuit Signal Block Diagram
  11
- Analog Circuit Structure
  11
- Receiver
  12
- Front-End Radio-Frequency Amplifier
  12
- First Frequency Mixer
  13
- Intermediate Frequency Amplifier (if Amp)
  13
- Af Amplifier
  13
- Noise Suppression Circuit
  13
- Phase Locked Frequency Synthesize
  14
- Pll Circuit
  14
- Unlocked Detector
  15
- Transmitter
  15
- Rf Audio
  15
- Qt/Dqt/4Fsk Coding
  15
- Wide/Narrow Band Switch
  15
- Voltage-Controlled Oscillator(VCO) and RF Amplifier
  16
- Antenna Transfer Switch and Lpf
  16
- Power Control
  16
- Temperature Protection Circuit
  16
- Power Supply
  17
- Cpu Control System
  18
- Charter 6 Functions and Configurations
  19
- Function Definition and Parameter Configuration
  19
- Channel
  19
- Scan
  19
- Power/Battery Save
  19
- Vox
  20
- Tot
  20
- High/Low Power Switch
  20
- Squelch Level
  20
- Receive and Make Call
  20
- Radio Channel, Radio ID and Group ID
  20
- Low Battery Warning
  22
- Configurations
  23
- Squelch Level
  23
- High/Low Power Switch
  23
- Vox
  23
- Prompt Tone Turn On/Off
  23
- Check Battery Charging Status
  23
- Ctcss
  24
- Cdcss
  24
Chapter 7 Radio Debugging

25
- The Required Test Equipment
  25
- Debugging Introduction
  27
Chapter 8 Parameters

32
- Bill of Materials (Electronics)
  34
- Top Side
  49
- Bot Side
  50

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Abell A720T Instruction Manual

Abell A720T Instruction Manual (13 pages)

Brand: Abell | Category: Radio | Size: 2 MB

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