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Motorola ASTRO Digital Spectra Plus - User Manual

Motorola ASTRO Digital Spectra Plus
442 pages
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ASTRO
®
Digital Spectra
®
and Digital Spectra Plus
UHF
VHF
800 MHz
Mobile Radios
Detailed Service Manual

Table of Contents

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Motorola ASTRO Digital Spectra Plus Specifications

General IconGeneral
Frequency RangeVHF: 136-174 MHz
SignalingMDC 1200, DTMF
ModesDigital and Analog
ModulationDigital
Operating Temperature-30° C to +60° C
Digital FeaturesEncryption

Summary

Foreword

Product Safety and RF Exposure Compliance

Information on safety and RF exposure compliance requirements.

Commercial Warranty

Limited Warranty

Details on what the warranty covers, for how long, and remedies.

Chapter 2 General Overview

2.4 Control Head Assembly

Discussion of control head components: displays, controls, LEDs, ports, and power.

2.5 Power Amplifier

Description of the power amplifier stages, power control, circuit protection, and DC interconnect.

2.6 Front-End Receiver Assembly

Description of the receiver front-end components: preselector, mixer, and injection filter.

2.7 RF Board Basic

Description of RF board components, synthesizer, and digital back-end module.

2.8 Voltage-Controlled Oscillator

Explanation of VCO components and operation for VHF, UHF, and 800 MHz radios.

2.9 Command Board

Description of command board functions, integrated circuits, and power control.

2.10 ASTRO Spectra Vocoder;Controller Board

Description of the VOCON board, its MCU, DSP, and interface circuits.

Chapter 3 Theory of Operation

Chapter 4 Troubleshooting Procedures

4.1 ASTRO Spectra Procedures

Troubleshooting procedures for ASTRO Digital Spectra radios, covering handling and errors.

4.2 ASTRO Spectra Plus Procedures

Troubleshooting procedures for ASTRO Digital Spectra Plus radios, including self-check errors.

4.3 VCO Procedures

Band-specific troubleshooting procedures for the VCO, including out-of-lock conditions.

4.4 Receiver Front-End (RXFE)

Band-specific troubleshooting procedures for the receiver front-end.

4.5 Power Amplifier Procedures

Band-specific troubleshooting procedures for the power amplifier, including PA functional tests.

Chapter 5 Troubleshooting Charts

Appendix A Secure Modules

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