User's Manual

DMR repeater 18/02/2011 Versione 1.3
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1 RADIO ACTIVITY DMR REPEATER AND EXPANDIBILITY TO SIMULCAST NETWORK
Radio Activity DMR repeater is designed to be modular from both HW and SW point of view, to maximize its
flexibility and minimize costs, physical dimensions, consumptions.
Basic model already has all the characteristics to work as a double standard repeater with all the features of
analogical and digital service. It can be equipped with double receiver to counteract fading effects through
diversity space reception. It is set to host communication and synchronization embedded devices to make the
network expandable to a multi-frequency or iso-frequency multi-site system, with different type of links,
operating with different transportation system topology, like microwave, UHF, fiber optics, generic TCP/IP
connections.
Privileged communication interface is ethernet standard type, maximally compatible with more diffused
technology. This interface supports not only voice and data digital traffic, but also remote control
management, which for Radio Activity equipment is very powerful: it is possible to have a complete monitor
system of equipment status, it is possible to modify each parameter, to down-load each SW and configuration,
launch self-test and calibration functions, to perform specific tests through internal embedded function
generators and software analyzers of the station. For analogical voice traffic instead, a 2/4 wire and criteria
line interface is available.
Remote control service can be performed through an ethernet connection pre-existing in the site, or through
GPRS modem which can be integrated into the station, or through the radio channel and another Radio
Activity station.
Fully modular structure allows to best configure the radio equipment, by adding and/or changing the required
HW and SW functional blocks, to work as simple repeater, multi-frequency multi-site repeater, iso-frequency
multi-site repeater. The basic structure of a base station is made of:
PSU module (not isolated 12Vdc from battery);
DSP module;
RX module;
TX module.
Optional modules and accessories are:
I/O module with line interface with or without GSM/GPRS and GPS unit;
PSU module for isolated power supply sources at 12V, 24V or 48V dc;
RX module with diversity receiver;
Duplexer, circulator or both;