TETRA eXTRAS at full power B
earing the brand-name eXTRAS was a TETRA infrastructure family displayed on the stand of 3T
Communications, a specialist business unit of the Austrian group Frequentis. “It is based on the switching technology that Frequentis put together, that gets used by the Cassidian system as well”, explained Robert Jastram, of 3T. “And in the off ering of Motorola’s compact base stations between 2001 and 2007 was also our technology. So as far as the heritage of TETRA technology, a lot of the larger OEMs originated here. “T e latest birth in the family of eXTRAS
technology is this Solo base station – solo in the sense that it is a completely self-contained unit that has the ability to retain all of the traditional functionality of a full site, including things like the verifi cation of the user. It keeps a copy of the database of all the users at each one of the sites. “T is is actually the only compact TETRA
Thomas Haschberger, chief executive of 3T Communications, with the new eXTRAS Solo TETRA base station. Units have already been supplied to Russia and South Africa as well as to system operators in western Europe
base station that has full power capability and full functionality currently on the market. It can be put together as a one-carrier or potentially as a two-carrier confi guration. T e box has the power supply and the duplexer in it, and all the logic for the trunking functionality, etc. You can even have a second one: it extends up to two carriers. “However, the entire switching infrastructure
is the same switching infrastructure that very large systems with multi-hundred base stations in use. So there is no diff erentiation between the small systems and the large systems.”
Cordless speaker- microphone
M
aking its debut at
PMRExpo, among a wide range of audio accessories on the Imtradex stand, was the Aurelis Bluetooth speaker- microphone. This wireless addition
to the company’s Aurelis series incorporates a push-to-talk button, a microphone, high-quality speakers, an emergency button, a three-level volume control, two-colour LED and expansion potential for connecting external audio devices. “The possibilities with our new Aurelis series give the user in task forces and security agencies the optimal use of the digital radios”, said Mathias Iser, the company’s technical director.
Above: “The Aurelis has, as all our other hand microphones, a very robust splash- proof plastic housing”, said Mathias Iser, of the radio accessories supplier Imtradex
and telemetry products for control and monitoring applications using GSM and TETRA. Latest innovation from the company is a compact TETRA radio card, developed
Machine-to-machine TETRA P
ossibly the company which had the shortest journey to make to the exhibition hall was Funk-Electronic Piciorgros, of Cologne, a specialist in radio modems
in-house. “This makes us independent from others, because we started with external modems and we fi xed some bugs and we did research for them”, explained r&d engineer Dirk Reufsteck. “But we wanted to have it in our own hands, so now we have the knowledge, we have the product. If we have to change something, we can do it on our own – we don’t have to ask whoever.” One such development Piciorgros has already implemented is a simplifi ed
alternative to some of the rather complex command language used for controlling radio modems – for example, for the common requirement of initiating a packet data transfer. “We said, why is it that complicated? It’s just to enable packet data, that’s it. And
so we made a command to enable packet data. And then our modem gets this command and it enables packet data. And that’s everything.” Another problem solved by the board, he said, is that some TETRA base
Dirk Reufsteck, development engineer at Piciorgros, with a TETRA-enabled industrial controller and, in his right hand, the company’s new TETRA card
stations are apt to ‘forget’ telemetry devices after 30 minutes if they do not transmit frequently. “We had this problem and we solved it with implementing in our TETRA stack to send a packet to the base station. So maybe we fi xed some base station bugs! We recognized it, and it was half a day!”
34 TE TRA TODAY Issue 6 2012
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