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doing your leasing with somebody who is actu- ally not going to be requiring to use the radio at exactly the same time that you are!”


Why choose DMR? Drawing the discussion towards its end, Adrian Grilli asked for some closing thoughts on what would make users choose Tier III DMR. “I think it’s so long overdue in being a re-


placement for MPT [1327] that I think there won’t be any diffi culty in fi nding people to take it up”, said Tim Sunderland. And Tom Mock- ridge agreed: “T ere are a lot of very old sys- tems out there that people want to upgrade to digital and this now another choice”, he added. “T ere’s a lot of 1327, and it’s probably a no-


brainer”, said David Taylor. “T e battleground, perhaps, is going to be new applications. For people who have perhaps moved from PMR to mobile phones but fi nd mobile phones don’t quite meet their business needs, there hasn’t re- ally been anything in a suitable price range for them to go to. And this is one of the tools they could be looking at.” “From Arqiva’s point of view, it’s actually


having the kit there on the shelf”, declared John Mills. “T ere are people asking for it – ‘When can you deliver it?’ And that is the ques- tion: when can we actually have it?” To this question at least, Jamie Bishop, of


Tait, had a simple answer. “September 16, I believe, is the day on which we can ship”, he said. “And anybody who wants to see a sys- tem can see one today – we have one in our Huntingdon offi ce and it was literally rigged up on Monday!” Kevin Delaney, of Ofcom, wondered about


the predicament of MPT 1327 users in Band III. Because of the presence of broadcasting


in this band, and possible expansion of DAB/ DAB+ services, DMR manufacturers might not feel it was worth their continued atten- tion. “Quite how long these analogue systems in Band III can keep going, I don’t know”, he said. “But is anybody really going to introduce any new Band III kit? “At some point they are probably going to


have to come out of Band III. T ey might have to, anyway, if the broadcasters start jumping up and down. We don’t know; we will have to wait and see. “I would be interested to see if anybody can


make use of Low Band for very wide area sys- tems – wider area systems”, he went on. But he warned: “If we’ve got large chunks of spectrum that the PMR industry is not making use of, it gets to a point where Ofcom can’t justify keep- ing it for land mobile. And we just feed it back into the pot and say, ‘Has anybody got a use for it, regardless of the industry?’ ”


Technology workhorse “I think there’s so many reasons why DMR is very attractive in many applications, always recognizing there’s a place for the others”, Tim Cull said. “DMR is a nice workhorse type of technology for very many applications, and the trunked version of it is spectrally effi cient in a world where spectrum is going to become an increasingly diffi cult subject. T is is an indus- try which is going to become a victim of its own success unless it responds. It’s as simple as that.” And Jamie Bishop, of Tait, added: “DMR


Tier III is the natural migration for trunked user today who isn’t using Tetra. If you look at what we and, I believe, other manufacturers are bringing to market, there is a familiar legacy.


A slot for Tier III W


here does Tier III DMR fi t into the mobile communications map?


“There is P25, there’s Tetra and there’s dPMR and there’s good old 1327, and Tetrapol in France”, Adrian Grilli pointed out. “Do we see it has a niche in the market, or is it going head-to-head with these other technologies?” Jamie Bishop, of Tait, saw Tier III as occupying a defi nite niche somewhere below the “ultra-mission-critical” zone of Tetra and P25 – though it did also extend into that area, which was why Tait offered features such as encryption. “It does go up into the high-tier public safety with things like military where they require VHF operation [Tetra is not available for VHF use] – but it also dips down quite low, potentially, into the kind of area where you have trunked operation – for example in a shopping centre. Even down to that level. “The Tait solution itself is aimed more


towards the higher-tiered area. Mission- critical, utilities, public safety are prime targets.”


And that should reinforce the Band III security in terms of analogue equipment, because there is a commonality between our hardware which will secure for you analogue Band III equip- ment for the foreseeable future. We have no obsolescence plans in that band. T at should be comforting.”


This diagram from Tait shows how today's mobile radio technologies align with the needs of different types of user organization


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