User's Manual

DMR repeater 24/01/2011 Versione 1.1
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1 INTRODUCTION
This document illustrates the applications and how to use the Radio Activity DMR base stations management
software.
Radio Activity DMR base stations can support a lot of applications and the management software is designed
with forms for reading the parameters that can change depending on the particular application.
For that reason the forms shown in this document may be different from the ones in use or they could not
appear in your application if the specific functionality is not enabled.
Some forms may be incomplete because it is a work in progress, please notify us errors or inconsistencies.
2 CONCEPTS OVERVIEW
The Radio Activity DMR Base Station can include several TRX (master and slaves), where TRX refers to a
transmitter, one or many receivers, DSP, IO board and a power supply.
Radio Activity DMR Base Stations allow many different applications: they can work like a single repeater or in a
radio network made of different repeaters linked together in different way such as Ethernet link, RF link.
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The core of “physical layer” of the system is a unit which via software performs every function of signal
processing into radio station.
So, it is not necessary to add boards (like synchronizers, phase and amplitude equalizers, signal decoders,
modem, etc.) because the functions can be implemented by routines which can be freely matched, down-
loaded and with superior performance.
Communication and control functions of module are entrusted to a microprocessor which manages
communications with external world and with other equipment modules. The microprocessor is based on
LINUX operative system; it can manage a LAN ethernet 10/100 interface both for copper line and for optical
fiber links, it is equipped with 4 serial ports to manage radio modules, GPS, auxiliary devices, external hosts; it
is equipped with a Real Time Clock with tampon battery; it controls an embedded PLL to synchronize the
entire station upon an internal (VCTCXO 0.5 ppm) or external temporal reference. DSP module is equipped
with a synchronous serial port according RS485 standard levels, which can be programmed up to 16Mbit/s and
can be used to interconnect together more transceiver or additional equipments.
Main performed functions are the following: