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2. List of amateur radio modes - Wikipedia

   en.wikipedia.org/wiki/List_of_amateur_radio_modes

   Morse code is called the original digital mode. Radio telegraphy, designed for machine-to-machine communication is the direct on / off keying of a continuous wave carrier by Morse code symbols, often called amplitude-shift keying or ASK, may be considered to be an amplitude modulated mode of communications, and is rightfully considered the first digital data mode.

3. M17 (amateur radio) - Wikipedia

   en.wikipedia.org/wiki/M17_(amateur_radio)

   A local amateur radio club he was a member of, was involved in digital voice communications. Kaczmarski, having experimented with TETRA and DMR , decided to create a completely non-proprietary protocol and named it after the club's street address - Mokotowska 17.

4. List of amateur radio software - Wikipedia

   en.wikipedia.org/wiki/List_of_amateur_radio_software

   Logging, Transceiver control, Callbook lookup, QSL handling (Hardcopy / LoTW / eQSL / Club Log), Awards, DX Spots, Digital Modes DXLab by AA6YQ Freeware Windows Logging, Transceiver control, Rotor control, Callbook lookup, QSL handling (Hardcopy / LoTW / eQSL / Club Log), Awards, DX Spots, Digital modes Emacs QSO Logger: Open-Source (GPL-3.0)

5. Amateur radio - Wikipedia

   en.wikipedia.org/wiki/Amateur_radio

   Specialized digital modes such as PSK31 allow real-time, low-power communications on the shortwave bands but have been losing favor in place of newer digital modes such as FT8. Radio over IP, or RoIP, is similar to Voice over IP (VoIP), but augments two-way radio communications rather than telephone calls.

6. FT8 - Wikipedia

   en.wikipedia.org/wiki/FT8

   A 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.

7. Amateur radio frequency allocations - Wikipedia

   en.wikipedia.org/wiki/Amateur_radio_frequency...

   In addition, the FCC continues to require that all digital transmissions be centred on the channel-centre frequencies, which the Report and Order defines as being 1.5 kHz above the suppressed carrier frequency of a transceiver operated in the upper side-band (USB) mode. As amateur radio equipment displays the carrier frequency, it is important ...