Open Source DMR Modem Implementation in SDR with GNU Radio and Codec2

Open source DMR (Digital Mobile Radio) modem implementation in software defined radio with GNU Radio and Codec2 Digital Mobile Radio (DMR) is a mobile radio standard created by ETSI, which is very popular within the amateur radio community. DMR radios are easily available on the market and the costs are low compared to D-Star or YSF radios, although the complexity of usage creates a barrier for entry. In addition, there is a very large community of listener-only amateurs who are interested in receiving digital transmissions using this mode. A very basic DMR modem (receiver and transmitter), capable of voice calls, that could emulate a subscriber radio using a SDR transceiver as the radio interface is described in this page. While this modem is just a proof-of-concept interpretation of the DMR standard with no real use-case, there exists at least one open source project which proposes to create an open source DMR transceiver. The OpenRTX project is "a free and open source firmware f ... Read full article.