User Manual

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Table Of Contents

1GENERAL
1.1Introduction
1.2Manual Organization
1.3VT-4B 136 - 174 MHz Transmitter Family Models
1.4Performance Specifications
1.4.1General
1.4.2Audio Specifications
1.4.3Physical Specifications
2THEORY OF OPERATION
2.1Transmitter Operation
2.2Transmitter Programming
2.2.1Transmitter Wide Options
2.2.1.1Disable Front Panel Led
2.2.1.2Secure Hardware Equipped
2.2.1.3Allow Emergency Transmissions
2.2.1.4Allow Radio Inhibit
2.2.1.5Allow Radio Check
2.2.1.6Enable Status
2.2.1.7Frequency Band
2.2.2Channel Wide Settings
2.2.2.1Frequency
2.2.2.2Voice/Signal Type
2.2.2.3Squelch Type
2.2.2.4CTCSS Tone
2.2.2.5Enable Reverse Burst
2.2.2.6DCS Code
2.2.2.7DCS Invert
2.2.2.8Enable Turn Off Code
2.2.2.9Transmitter Power
2.2.2.10Channel Bandwidth
2.2.2.11Deviation
2.2.2.12Time Out Timer
2.2.2.13Channel Status
2.2.2.14Transmitter Pre-emphasis
2.2.2.15NAC Transmitter Code
2.2.2.16NAC Transmitter
2.3Transmitter Programming using Motorola Radio Service Software
2.4Secure Communications
2.5Transmitter Assembly and Adjustment
2.5.1Controller Board Alignment
2.5.1.1Reference Oscillator Adjustment
2.5.1.2Transmitter Deviation Balance Adjustment
2.5.1.3Transmitter Deviation Limit Adjustment
2.5.2Amplifier Alignment
2.5.3Frequency Change
2.6Recommended Test Equipment List
2.7Repair Note
2.8Printed Circuitboard Numbering Convention
3ILLUSTRATIONS
3.1MT-4 Base Transmitter Front Panel
3.2MT-4 Transmitter Case - Exploded View
3.3Digital Base Transmitter Block Diagram
3.4Digital Base Transmitter Schematic Diagram
3.5Digital Base Transmitter Main Board Component Layout (Bottom)
3.6Digital Base Transmitter Main Board Component Layout (Top)
4PARTS LIST
4.1P25 Base Transmitter Main Board Parts List
4.1.1P25 Base Transmitter Main Board Electrical Parts List
4.1.2P25 Base Transmitter Mechanical Parts List
5REVISION HISTORY

3 FINGER GASKET (2)

Transmitter Case Removal:

1. Remove Screws A (four M3x8mm).

2. Remove Screws B (four M5x8mm).

3. Hold Front Panel and Pull Case.

ELECTRONICS

DANIELS

P25 Digital Base Transmitter Instruction Manual

xT4DBM2

3-2

3.2 Digital Base Transmitter Case - Exploded View