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FreeDMR is an open networking project for Digital Mobile Radio (DMR) amateur radio, intended to provide software and infrastructure for linking DMR repeaters, hotspots and other systems over IP networks. The name FreeDMR is used for more than one related codebase, so it is important to distinguish the original dk7lst/FreeDMR project, which describes itself as tools for an open DMR repeater network and is licensed under GPLv3, from later FreeDMR Peer Server implementations derived from HBlink3; the latter are Python-based systems designed to assist in building peer mesh networks. GitHub+1 In practical amateur-radio deployments, FreeDMR can operate as a network server and use configuration for systems, peers, talkgroups, access-control lists, reporting and bridging, with implementations providing facilities such as master and peer modes, talkgroup routing, subscriber and peer identification data, logging, and OpenBridge connectivity.
Current FreeDMR installations can also be associated with dashboards and Docker-based deployment, while configuration files commonly contain parameters for server ports, passwords, network identifiers, peer connections, talkgroup permissions, timeslot ACLs and group hang time. GitHub FreeDMR is therefore relevant to operators interested in DMR networking, MMDVM hotspots, DMR repeaters, DMR servers, IP linking, talkgroups, TS1, TS2, colour code, radio ID, peer connections, network IDs, OpenBridge, HBlink, Python, Linux, Docker, ACLs, logging, dashboards and digital voice communications.
The wider FreeDMR network maintains a worldwide server list, including Australian servers, and publishes information about network hosts and their connectivity, while its bridge information documents connections between FreeDMR talkgroups and other digital voice systems such as YSF, P25, NXDN, AllStar, Wires-X, Echolink, XLX, FCS, URF and TGIF. FreeDMR+1 From an RF perspective, FreeDMR should not be confused with the DMR air interface itself: DMR is the digital radio technology used between compatible radios and repeaters or hotspots, whereas FreeDMR primarily concerns the network-side infrastructure that transports and routes DMR traffic.
A typical amateur installation therefore involves several distinct components: a DMR transceiver configured with a valid amateur radio ID and appropriate codeplug, a repeater or hotspot providing the radio-frequency interface, and FreeDMR server infrastructure providing IP-based connectivity and talkgroup routing. DMR uses two timeslots within a 12.5 kHz RF channel, allowing two logical conversations to share the repeater channel under the DMR protocol, while talkgroup IDs determine the logical destination of group traffic; exact talkgroup behaviour, static links, dynamic links and routing policies depend on the particular network configuration rather than being inherent properties of FreeDMR.
For operators, correct configuration of frequency, colour code, timeslot, talkgroup ID, radio ID, contact settings and network access is essential, and local repeater or network rules always take precedence. FreeDMR is particularly interesting to technically minded amateurs because its open-source approach permits examination and modification of the server software, routing rules and network configuration rather than requiring an operator to rely exclusively on a centrally controlled commercial platform.
The project documentation and source repositories should nevertheless be checked before deployment because FreeDMR has multiple forks and implementations with substantially different development histories and feature sets; one publicly available FreeDMR Peer Server repository explicitly describes itself as a heavily diverged HBlink3 fork, while the original DK7LST repository is an older project that states that it was under construction and not yet functional. GitHub+1
FreeDMR remains a useful subject for amateur-radio experimentation involving DMR, digital voice, repeater networking, IP transport, open-source software, talkgroup management, peer-to-peer connectivity, MMDVM, HBlink-derived infrastructure, Linux server administration and interoperability between digital amateur-radio networks. GitHub+1
And this is in colour