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DMR repeaters each have the capability to provide local, regional and worldwide repeater coverage. Much more than that though, the network allows two completely separate QSOs at the same time, a unique feature made possible 
using Motorola's "Time Division Multiple Access" (TDMA) technology. This enables a TDMA repeater to divide transmissions into two discrete and pre-selectable "talkgroups", routing them appropriately to others monitoring the same group anywhere around the world. Effectively, this means two completely separate voice channels are possible within one standard 12.5kHz frequency allocation - highly efficient use of the spectrum!

What this means in practice is that to set up a QSO, just select the desired talkgroup on a suitably programmed radio, key up and you will be heard on every repeater on the same group worldwide. Very easy and for mobile use, very safe.

Graphic detailing difference between TDMA and combined analogue and digital systems
Whats so good about MotoTRBO DMR TDMA?
Time-Division Multiple-Access (TDMA) preserves the full channel width and divides it into alternating time slots that can each carry an individual call. Motorola maintains that two-slot 12.5 kHz TDMA-based systems, providing 6.25 kHz equivalency, are the better choice for most large organization/enterprise radio users. This means that two seperate conversations can be handled by the one repeater, on the same frequency but a different "channel".

TDMA technology for narrowband 12.5 KHz (6.25 equivalent-6.25e) organization/business radio users, provides advantages of feature flexibility, lower equipment costs, longer battery life, future-readiness, and the proven ability to increase spectral efficiency without risking increased congestion or interference.

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DMR, like all repeaters needs the support of the people who use them to ensure they are always available for use not only now but in the years to come.

Many repeaters are funded out of the pocket of the Repeater Keeper themselves and with the introduction of Digital Repeaters like the DMR ones there are monthly costs for the internet connectivity.

As to what will happen with any Donations made via this website this is yet to be decided and when this has the information will be posted here at the time the Donate button becomes operational. This will allow an individual to decide if they wish to donate to DMRUK or not.

DMRUK - Amateur Radio for the 21st Century

motorola, mototrbo, DMRUK Network Co-ordinator, Michael Lockwood, dmr, dmr-marc, Howard M0HRE, John G0SJB, gb7dd, gb7aa, gb7hx, gb7td, g1xcc, amateur radio, digital radio, urh, motorola, dr3000, dp3400

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