PMR
the RD 965. “It’s a DMR Tier II product with an output power of 10 W with a battery pack that facilitates eight hours of operation with- out the need for an external power supply”, said Markus Oltmanns. “You can take it with you – let’s say, in some crisis situation, or some area where you have an occurrence, like, on a mountain or in the woods, where you have an urgent need for a communication system. You can take it with you, place it somewhere, just switch it on and have a complete Tier II-com- pliant radio system working.” With its rugged housing, the unit is also
suitable for fi xed operation. “It is IP67, it’s wa- terproof, it’s almost dust-proof”, Mr Oltmanns continued. “T ere’s no moving parts in it like fans, so you can just mount it to a wall and connect it to an antenna system. It has IP con- nection capabilities in order to build up a large network. “With the battery pack it’s about 6 kg. T e
battery pack itself brings some intelligence with it. If you connect it to a power supply the battery will be charged if the repeater is in op- eration at the same, in order to make sure that the repeater or the battery pack itself is usable at any time.
Tier II compliant radio system to take away N
ew on the Hytera Mobilfunk stand was a portable, vehicle-mountable repeater,
Digital dispatchers Also on display were the company’s Access- net DWS touch-screen dispatcher applica- tion for Tetra systems and, making its debut, the SmartDispatch system for DMR. “We have even more features than with the Tetra dispatcher”, Mr Oltmanns said proudly. “We have a dispatch area which can be seen here for calls to the telephone network, we have calls to the radio network. We have GPS localization and geo-fencing already included: this screen area is an allowed area and you can also defi ne forbidden areas. So if the subscriber enters a forbidden area, he will have an alarm. Messag- ing is already included, as you can see here – status messages, for example. T is is the main diff erence to the Tetra dispatcher: this is the voice recorder already included. “We have a report area where you see every-
Markus Oltmanns presents Hytera Mobilfunk’s new DMR portable repeater
“We have a GPS connector in order that you
can monitor the location of the mobile system. So if you use it in the woods or on the moun- tains, you can connect it to a dispatcher appli- cation so you can easily locate the equipment itself. You can also use the repeater as a radio.”
thing that is happening within the radio sys- tem. You can see the call type, start time, dura- tion, who is calling. You can easily select them, press a playback button and you can listen in after. You can export fi les on an external hard disk, for example, and for countries where you are not allowed to track or record these details, you can disable it by a software key.”
• Information:
www.hytera.de/en/
An extra half a slot for digital users T
etra, dPMR and DMR are not the only routes to digital for PMR users. A further
possibility is the so-called e-DMR system devel- oped by the French manufacturer Detracom. With its TDMA time-slotted transmission format, this is similar to DMR except that it has what might be seen as 2½ time-slots instead of just two. The extra half-slot is used as a control channel, enabling the two traffi c channels to be operated independently. In France, the system has proved attractive
to users in the public utilities who hold low- band spectrum assignments, a band for which other digital technologies are not available. “The users are people who need large
geographical coverage but they need data communications at the same time as voice – for example, electricity companies, security forces”, says Serge Huc, managing director of Detracom. “They are very, very numerous. Our core market is low band, where there are many analogue networks and these users thought they would have to change to UHF, at a large
18
increase in site costs. When they discover e- DMR, they all go, ‘It can’t be!’ And when they see it working, they say it’s marvellous!” “At present our system is a single-channel
system but we are working on the speci- fi cations of a trunked e-DMR system. The spectrum effi ciency of our system is very good because two of our RF channels are equivalent to six channels in MPT 1327.” Detracom is continuing to developing e-
DMR technology to add new capabilities – an automatic terminal tracking system is among the latest. “Low band users are everywhere, and for now this niche is enough for us to grow”, M Huc says. “We are in discussion with other man- ufacturers for them to adopt e-DMR technology, so we are not alone any more. We truly believe that we don’t have to remain alone with this technology. Maybe in the future you will fi nd multiple manufacturers – different manufactur- ers that will sell more and more networks.”
• Information:
http://www.detracom.fr/fr/en/
Serge Huc, of Detracom, with the DPE160 triple-mode radio: it offers analogue and e-DMR in three VHF bands plus (optionally) GSM and GPS – a SIM card slot can be seen inside
LAND mobile January 2013
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