Digital Mobile Radio
Digital Mobile Radio (DMR) is an international digital radio standard developed by the European Telecommunications Standards Institute.
DMR improves channel efficiency using two TDMA time slots. In a weak signal situation the voice quality is much more better than analog FM.
Here is some DMR related links
Last heard stations at TGIF Network - Last heard stations via BM2441 server - Connected stations to BM2441 server - Status of OH4RUC repeater - Status of OH4AC hotspot - Status of OH4VA hotspot - FinDMR Facebook group - Registration System for Digital Voice Services