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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. 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 ...

4. M17 (amateur radio) - Wikipedia

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

   M17 is a digital radio modulation mode developed by ... M17 uses Frequency-Division ... free and open-source firmware for ham radios; WPSD - digital voice software ...

5. 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.

6. Amateur radio - Wikipedia

   en.wikipedia.org/wiki/Amateur_radio

   Radio amateurs are limited to a specific set of frequency bands, the amateur radio bands, allocated throughout the radio spectrum, but within these bands are allowed to transmit on any frequency using a variety of voice, text, image, and data communications modes. This enables communication across a city, region, country, continent, the world ...

7. PACTOR - Wikipedia

   en.wikipedia.org/wiki/PACTOR

   PACTOR was developed in order to improve the reception of digital data when the received signal was weak or noisy. [1] It combines the bandwidth efficiency of packet radio with the error-correction (CRC) and automatic repeat request (ARQ) of AMTOR. Amateur radio operators were instrumental in developing and implementing these digital modes.