User's Manual

DMR repeater 24/01/2011 Versione 1.1
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The current flowing into final amplifier transistor is continuously monitored by microcontroller to verify the
correct functioning and to reveal any efficiency degradation.
The module is equipped with an harmonic filter to lower spurious emissions under required levels by existing
regulations.
2
2
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.
2
2
R
R
A
A
D
D
I
I
O
O
A
A
C
C
T
T
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I
V
V
I
I
T
T
Y
Y
D
D
M
M
R
R
R
R
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E
P
P
E
E
A
A
T
T
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E
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R
A
A
N
N
D
D
U
U
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P
G
G
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R
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D
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B
B
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L
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S
S
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M
U
U
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C
C
A
A
S
S
T
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N
N
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W
W
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K
K
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 single-frequency multi-site system, with different types of links,
operating with different transportation system topology, like microwave, UHF, optical fibers, IP connections.
Privileged communication interface is Ethernet standard type, 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, single-
frequency multi-site repeater.
2
2
.
.
3
3
N
N
E
E
T
T
W
W
O
O
R
R
K
K
It is possible to configure the network in many different ways, with different kinds of links (Ethernet, RF,
Optical fibers)
2.3.1 MASTER BASE STATION IN “RF LINKED” NETWORKS
The master base station is equipped with a “voting system”, which select the “best” signal among all the
signals received by the Satellites and the local receiver(s).
Besides this the master sends the digital synchronization towards the satellites and, in the case of Base
Stations “RF linked” equalizes the absolute and group delay due to the RF channel.