DRAFT D
TNM-M-E-0001 Page 1
1. INTRODUCTION
1.1 General
The SRM9000 series of FM mobile radio transceivers is designed for conventional PMR and
Trunked operation in VHF and UHF radio systems.
The system is available in a number of functional variants. Each variant uses the standard
SRM9000 mobile transceiver, which is software configured for different control ancillaries. The
software configuration together with the type of controller (Basic or Enhanced microphone,
Handset, or Alphanumeric Control Head) determines the radio features for the different variants
as follows.
PMR/Trunked
Basic Telemetry Transceiver No Display or Control Head SRM9005
Low Range Version with Basic Control Microphone SRM9010
Mid Range Version with Enhanced Control Microphone SRM9020
Handset Version with Alpha Display Handset SRM9025
System Level Remote Version with Alpha Display Handset SRM9030
1.2 Scope
This manual provides technical specifications, description and servicing details for the SRM9000
series of mobile radio transceivers together with the related microphones and control heads.
Unless specifically stated otherwise, the text and illustrations refer to all versions in the series.
1.3 Description
The design concept utilises wide band analogue techniques for RF transmit and receive circuitry
with digital signal processing for narrow and wideband modulation and demodulation. Electronic
tuning is used throughout the mobile to eliminate manual tuning and level adjustment.
A Digital Signal Processor (DSP) and a Field Programmable Gate Array (FPGA) 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 12.5/20/25kHz FM signals 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 Transceiver comprises a rugged extruded aluminium sleeve which houses a
single printed circuit board assembly and provides all heatsinking 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.
There are two installation options available for the SRM9000. The outer aluminium extrusion
has side flanges which allow the mobile to be bolted directly to any flat surface in the vehicle. A
quick release cradle is also available.
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