The DMR standard operates within the existing 12.5 kHz channel spacing used in land mobile frequency bands globally. Its primary goal is to specify a digital system with low complexity, low cost and interoperability across brands, so radio communications purchasers are not locked into a proprietary solution. DMR provides voice, data and other supplementary services. DMR is a two-slot, time division multiple access (TDMA) system offering voice, data and a range of other features and applications. The specification covers the RF frequency range 30 MHz to 1 GHz and uses 4 level FSK constant envelope modulation.
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Sistema de comunicação digital utilizado por muitos radioamadores nos Estados Unidos e apresentado no vídeo acima.
