About DMR

What is DMR?

The DMR 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 "talk groups", 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 talk group 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.

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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