Modes

The original digital mode: on/off keying of a continuous-wave carrier, sent and read by ear.

Servers that link repeaters and hotspots across different digital voice networks together, so operators on different systems can talk to each other.

A digital voice protocol with its own reflector network for linking repeaters over the internet for wider reach.

A multi-mode digital voice modem that lets one radio talk to DMR, D-STAR and C4FM networks instead of needing a separate radio for each.

Automatic Packet Reporting System: broadcasts real-time position and short text messages over VHF, picked up by other stations and internet gateways.

Links a radio station to the internet over VoIP, so it can reach other stations and repeaters worldwide, not just ones in range.

Digital Mobile Radio: a digital voice standard that fits two conversations into the channel space one analog FM signal would use.