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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. 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. WSJT (amateur radio software) - Wikipedia

   en.wikipedia.org/wiki/WSJT_(amateur_radio_software)

   As of WSJT10, supported fast modes are JTMS, FSK441, ISCAT, and JT6M, and the slow modes are JT65 and JT4. [2] WSJT-X 1.8 additionally implements the "slow" JT9, FT8, and QRA64. Some modes have derived submodes with larger tone spacing. [2] Two other modes, WSPR and Echo are included for measuring propagation and testing moon bounce echo. [2]

5. Comparison of radio systems - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_radio_systems

   World radio systems (Terrestrial) System Type Modulation Data rate Sidebands? Ch. Bandwidth Radio spectrum Sound Codec Digital subchannels SFN Metadata/RDS/RBDS; AM radio: Analog radio: Amplitude Modulation: N/A? 18–20 kHz: 148.5-283.5 kHz (Longwave) 510–1610 kHz (Europe) 510–1710 kHz (USA and Canada) N/A: N/A: No: None Motorola C-QUAM ...

6. 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 ...

7. 10-meter band - Wikipedia

   en.wikipedia.org/wiki/10-meter_band

   Morse code and other narrowband modes are found toward the bottom portion of the band, SSB from 28.300 MHz up, and wideband modes (AM and FM) are found near the upper part of the bottom portion of the band. Digital modes, such as PSK-31, are also allowed in the upper portion of the band, with 28.120 being a popular PSK-31 frequency.

8. AOL Mail

   mail.aol.com

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9. 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.