When you start your HamSphere transceiver you will have the look, feel and sound of a real Amateur Radio transceiver. The ionization due to the radiations from the sun based on Sunspot Numbers (SSN) and the Solar Flux Index (SFI) determine the behavior of the Ionosphere and follow the 11 year solar cycle. It also models hundreds of kilometers of atmosphere above the earth's surface, the ionization of gases in the upper atmosphere to realistically produce ionospheric layers. This network uses Motorola MOTOTRBO DMR repeaters and is available for all licensed Canadian ham radio operators to use. The HamSphere propagation model takes in to account the physics of planet Earth, its surface topography like the continents, land masses, water bodies, oceans, DMR-MARC Canada operates a Canada-wide ham radio network based upon the DMR standard. We are talking about the propagation conditions. how well we can reach distant places by radio worldwide. Because it is also the main cause for what can be achieved on shortwave and other bands, i.e. RadioID.Net Issues the IDs needed to authenticate your radio on the DMR network.HamSphere is a unique platform, the only one of its kind in the world providing the experience of a realistic HF radio.įor radio amateurs, the sun has a very special meaning. Ĭontent provided by Curt Kundred, W6FQ.ĪmateurRadio.digital Multiple sections for information on DMR IDs, database searches, code plugs and more There’s much more to this technology, and our friends at NorCal-DMR have put up a website to help us all learn as much as we’d like. Pave Paws has made many UHF frequency pairs available and rather than lose them NorCal-DMR has put them back to good use in the amateur ranks. Each repeater has very limited coverage but together, and with the use of roaming, the system is vast. What roaming has enabled NorCal-DMR to do is put up many very low level repeaters that don’t interfere with the Air Force’s radar system. The switch happens instantly never interrupting a transmission…In fact you may never know which repeater you’re using without looking at the radio’s screen. It automatically adjusts to the new repeater without operator intervention. A user can pick a talk group (a channel within the repeater), turn on roaming and the radio searches for the repeater with the strongest signal. Just as you would switch from tower to tower on your cell phone when driving, DMR radios have that capability as well. Therefore, Pave Paws has nearly shut down the UHF bands in Northern California.īut another capability of DMR is its roaming ability. As a result, MDARC and other Bay Area groups have been required to severely reduce the power of our UHF repeater. It uses the UHF frequency band which hams share with them. military radar system with an installation at Beale Air Force Base, about 50 miles north of Sacramento. They credit Pave Paws for helping them to grow. Great coverage combined with less expensive radios is driving DMR’s massive growth, but NorCal-DMR points to another, unlikely, factor for growth in our neck of the woods. Since then, several other companies have introduced radios for as little $150. This changed in November 2013 when Connect Systems Inc., based in Agoura Hills, California introduced a sub $200 DMR radio. Up until about two years ago a user might expect to pay around $750 for a handheld. Not so much in terms of repeaters but for the radios themselves. With these technologies there’s hope that the Amateur community can implement more infrastructure in what little spectrum is currently allocated to our wonderful hobby.įor many years DMR has been plagued by high costs. Further, the technology is built to operate in narrow band. In other words, it’s like having two repeaters on one box with just one pair of frequencies. The benefit of TDMA is that one repeater using just one frequency can support two simultaneous and separate transmissions. Our own W6CX multi-mode repeater is DMR capable.ĭMR is built on TDMA technologies. Motorola, who first championed the technology, builds most DMR repeaters in the amateur ranks. With the assistance of some professional software, NorCal DMR boasts that more than 90% of Californians can now hit a DMR repeater from their home.ĭMR is an open digital standard and today has many manufacturers building radios repeaters and other equipment. This repeater, K6MDD, became the first of what is now NorCal-DMR’s 40+ repeater network. ĭMR was introduced to the amateur ranks in 2009 and one of the first DMR repeaters in California was installed on Mt. One of the groups that’s been at the heart of this growth is NorCal-DMR. One of the fastest growing modes in Amateur radio is DMR or Digital Mobile Radio.
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