Digital amateur radio

thumb|right|300px thumb|right|350px|Slight timing errors are compensated for by redundancy (engineering)|printing each line twice.

upright|thumb|ICOM IC-91AD handheld transceiver with the D-STAR UT-121 digital voice board installed

thumb|200px|EchoLink working on Windows Vista. EchoLink is a computer-based amateur radio system distributed free of charge that allows radio amateurs to communicate with other amateur radio operators using Voice over IP (VoIP) technology on the Internet for at least part of the path between them. It was designed by Jonathan Taylor, a radio amateur with call sign K1RFD. Taylor has been the system engineer and administrator since 2002.

open source amateur radio mode

thumb|Radioteletype tuning indicator thumb|Tuning indicator on cathode ray tube Radioteletype (RTTY) is a telecommunications system consisting originally of two or more electromechanical teleprinters in different locations connected by radio rather than a wired link. Radioteletype evolved from earlier landline teleprinter operations that began in the mid-1800s. The US Navy Department successfully tested printing telegraphy between an airplane and ground radio station in 1922. Later that year, the Radio Corporation of America (RCA) successfully tested printing telegraphy via their Chatham, Mass

thumb|A Waterfall plot|waterfall display showing FT8 in use on the [[40-meter band.]] FT8 (short for Franke–Taylor design, 8-FSK modulation) is a frequency shift keying digital mode of radio communication used by amateur radio operators worldwide. It was released on June 29, 2017, by its creators Joe Taylor, K1JT and Steve Franke, K9AN, as part of the WSJT software package.

right|thumb|Antennas for High-speed Amateur-radio Multimedia Network (HamNET) in Europe, part of the wireless mesh network

small plastic screan with 2 atchments one with HF/el . C 2008 Apple

thumb|right|DAPNET logo DAPNET (Decentralised Amateur Paging Network) is a free global paging network created and maintained by amateur radio enthusiasts. Messages can be received on commercially available pagers that support the POCSAG protocol and are tuned to the appropriate frequency.