User's Manual

SRM9000X8 800MHz SERVICE MANUAL

1. INTRODUCTION

1.1 GENERAL

The SRM9000X8 800MHz mobile transceiver is designed for PMR operation in analog systems or P25 in digital

systems.

The SRM9000X8 transceiver can be used with either the SRM9022 Graphics Display Handset or the SRM9030

System Level Remote Control Head with Alpha capability.

1.2 S

COPE

This manual provides technical specifications, description and servicing details for the SRM9000 mobile radio

transceiver.

1.3 DESCRIPTION

The design concept utilises wide band techniques for RF transmit and receive circuitry with digital signal

processing of analog or digital modulation and demodulation. Electronic tuning is used throughout the mobile to

eliminate manual tuning and level adjustment.

A Digital Signal Processor (DSP) and a Programmable Gate Array (PLA) are used with other dedicated devices in

the SRM9000

to perform the following functions under software control:

• Frequency Synthesis of all operating frequencies.

• Modulation and demodulation of 12.5kHz or 25kHz FM signals or P25 digital modulation on a per

channel basis.

• Modem functionality for specified data modulation schemes.

• Filtering, pre-emphasis, de-emphasis, limiting, compression, muting, CTCSS, Selcall or any other

frequency or level dependent signal modification.

• Serial communications with the Control Ancillaries and Alignment Tool.

•

Tuning Control data for Tx and Rx.

The SRM9000 basic

Transceiver comprises a rugged extruded aluminium sleeve, which houses a single printed

circuit board assembly and provides all heatsink requirements. The sleeve housing is closed at each end by high-

impact plastic end caps; all cable ports and mechanical interfaces are sealed against moisture and dust ingress.

The PCB assembly comprises a single, multi-layer PCB containing all the RF and control circuitry. The PCB seats

on an extruded aluminium tray that slides into the outer aluminium sleeve where it is secured with screws

accessed from the outside of the case. Provision is made under the main PCB tray assembly for additional

hardware options as well as optional accessories plugged directly into the main PCB.

There are two installation methods available for the SRM9000. The outer aluminium extrusion has side flanges that

allow the mobile to be bolted directly to any flat surface in the vehicle. A quick release cradle is also available.