How can you join a digital repeater’s “talkgroup”?

Digital talkgroups act like virtual channels or meeting rooms within a digital repeater network, such as DMR, D-STAR, or System Fusion. To join one, you simply program your radio with that specific talkgroup's ID number or code, which routes your transmission to everyone else listening to that ID. You do not need to formally register with a frequency coordinator or a control operator just to select and use a standard talkgroup on a network. While DTMF tones are often used in analog amateur radio for linking systems like EchoLink or IRLP, digital talkgroups rely on programmed digital IDs rather than audio tones.