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2. List of amateur radio modes - Wikipedia

   en.wikipedia.org/wiki/List_of_amateur_radio_modes

   Most amateur digital modes are transmitted by inserting audio into the microphone input of a radio and using an analog scheme, such as amplitude modulation (AM), frequency modulation (FM), or single-sideband modulation (SSB). Amateur teleprinting over radio (AMTOR) D-STAR (Digital Data) a high speed (128 kbit/s), data-only mode.

3. 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.

4. M17 (amateur radio) - Wikipedia

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

   M17 is a digital radio modulation mode developed by Wojciech ... free and open-source firmware for ham radios; WPSD - digital voice software suite for amateur radio ...

5. Amateur radio - Wikipedia

   en.wikipedia.org/wiki/Amateur_radio

   Radiotelegraphy using Morse code, also known as "CW" from "continuous wave", is the wireless extension of landline (wired) telegraphy developed by Samuel Morse and dates to the earliest days of radio. Although computer-based (digital) modes and methods have largely replaced CW for commercial and military applications, many amateur radio ...

6. D-STAR - Wikipedia

   en.wikipedia.org/wiki/D-STAR

   There are other digital modes that have been adapted for use by amateurs, but D-STAR was the first that was designed specifically for amateur radio. Several advantages of using digital voice modes are that it uses less bandwidth than older analog voice modes such as amplitude modulation and frequency modulation .

7. PSK31 - Wikipedia

   en.wikipedia.org/wiki/PSK31

   A waterfall display depicting several PSK31 transmissions at around 14,070 kHz. The green lines indicate a station that is transmitting. PSK31 or "Phase Shift Keying, 31 Baud", also BPSK31 and QPSK31, is a popular computer-sound card-generated radioteletype mode, used primarily by amateur radio operators to conduct real-time keyboard-to-keyboard chat, most often using frequencies in the high ...