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  2. HD Radio - Wikipedia

    en.wikipedia.org/wiki/HD_Radio

    HD radio generally simulcasts an existing analog radio station in digital format with less noise and with additional text information. HD Radio is used primarily by AM and FM radio stations in the United States, U.S. Virgin Islands, Canada, Mexico and the Philippines, with a few implementations outside North America.

  3. List of radio stations in California - Wikipedia

    en.wikipedia.org/wiki/List_of_radio_stations_in...

    Call sign Frequency City of license Licensee Format; KAAD-LP: 103.5 FM: Sonora: Tuolumne County Arts Alliance: Variety: KAAT: 103.1 FM: Oakhurst: Lazer Licenses, LLC

  4. 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.

  5. Crystal radio - Wikipedia

    en.wikipedia.org/wiki/Crystal_radio

    Crystal radio. Swedish crystal radio from 1922 made by Radiola, with earphones. The device at top is the radio's cat's whisker detector. A second pair of earphone jacks is provided. 1970s-era Arrow crystal radio marketed to children.

  6. Digital radio - Wikipedia

    en.wikipedia.org/wiki/Digital_radio

    Convergent Digital Radio (CDR) (OFDM modulation over FM band IBOC sidebands) AM band in-band on-channel (AM IBOC): HD Radio (AM IBOC sideband) Digital Radio Mondiale (branded as DRM) for the short, medium and long wave-bands; Satellite radio: WorldSpace in Asia and Africa; Sirius XM Radio in North America; MobaHo! in Japan and the Republic of ...

  7. Radio Data System - Wikipedia

    en.wikipedia.org/wiki/Radio_Data_System

    Radio Data System ( RDS) is a communications protocol standard for embedding small amounts of digital information in conventional FM radio broadcasts. RDS standardizes several types of information transmitted, including time, station identification and program information. The standard began as a project of the European Broadcasting Union (EBU ...

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