- #DMR PROGRAMMING MULTIPLE RADIOS USING SAME I.D. INSTALL#
- #DMR PROGRAMMING MULTIPLE RADIOS USING SAME I.D. PROFESSIONAL#
- #DMR PROGRAMMING MULTIPLE RADIOS USING SAME I.D. SERIES#
In the case of DMR, the system rapidly switches between two channels on the same frequency. This is called TDMA or “time division multiple access” and is the approach TETRA and DMR both take. The second answer is to squeeze more conversations into the same space. We’d still get one digital channel on a given RF channel and we already have the ability to connect to other repeaters around the world – on the Isle of Man, our existing AllStar FM network is hard to beat in that respect. “Going digital” using this method doesn’t offer us very much. FDMA is the spectrum allocation method radio amateurs are most familiar with – a given band is divided into fixed bandwidth channels (for example the FM portion of 2m or 70cm). This is called FDMA or “frequency division multiple access”. In Fusion’s “voice only” mode, the single voice channel offered is still the same 12.5kHz wide that traditional analogue modes use. This is the method the likes of Yaesu’s fusion uses – in Fusion’s “voice and data” mode, a voice channel is fitted into 6.25kHz along with a data channel in a further 6.25kHz – still a total of 12.5kHz. The first is to make each channel narrower – in the past we went from 25kHz channels to 12.5kHz and now there’s pressure for 6.25kHz channels. There are two fundamental ways of achieving this improved efficiency and every technique really boils down to one of these solutions.
Inevitably, this technology is finding its way into the amateur world, often helped along by those same professionals. That is more conversations in less spectrum.
#DMR PROGRAMMING MULTIPLE RADIOS USING SAME I.D. PROFESSIONAL#
If you want to join in, sort yourself out with some gear, you’ll be very welcome.Īs pressure on radio spectrum increases, the professional communications world is coming up with ways of squeezing more into less. Some people want to use it and some don’t. Lastly, it’s not elitist (or similar) – no more so than someone you know using a band you don’t have (yet). So, it’s definitely not a data mode and there’s no typing! If you want that, go elsewhere. Next, we are talking about a telephony mode – that is, you talk to people. It also has repeaters which can be networked together to increase their coverage area. It has mobile and handheld radios (which are almost all dual-mode so they can be programmed with normal FM channels as well).
#DMR PROGRAMMING MULTIPLE RADIOS USING SAME I.D. INSTALL#
It has aerials which, if you don’t install them correctly, still don’t work – just like with FM. It’s proper radio, with RF which follows the same laws of physics as any other mode.
#DMR PROGRAMMING MULTIPLE RADIOS USING SAME I.D. SERIES#
Philips / Simoco PRF10 Series Yahoo! Groupįirst of all, what digital radio isn’t, is the “sit at a computer and type” mode that some, ill-informed, people have called it. Isle of Man Amateur Radio Society Website IOM Department Of Infrastructure Stations Tait Radio Academy - Introduction to DMR Study Guide
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