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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, [citation needed] with a few implementations outside North America.

  3. AM broadcasting - Wikipedia

    en.wikipedia.org/wiki/AM_broadcasting

    In large urban centers, AM radio signals can be severely disrupted by metal structures and tall buildings. As a result, AM radio tends to do best in areas where FM frequencies are in short supply, or in thinly populated or mountainous areas where FM coverage is poor. Great care must be taken to avoid mutual interference between stations ...

  4. Radio in the United States - Wikipedia

    en.wikipedia.org/wiki/Radio_in_the_United_States

    AM and FM digital subcarriers: In 2002 the FCC adopted iBiquity's in-band on-channel (IBOC) technology, branded as HD Radio, for adding digital subcarriers to AM and FM radio transmissions. This allows AM stations to concurrently transmit digital versions of their standard analog signals, and also provides a way for FM stations to transmit ...

  5. Transistor radio - Wikipedia

    en.wikipedia.org/wiki/Transistor_radio

    A classic Emerson transistor radio, circa 1958. A transistor radio is a small portable radio receiver that uses transistor-based circuitry.Previous portable radios used vacuum tubes, which were bulky, fragile, had a limited lifetime, consumed excessive power and required large heavy batteries.

  6. Digital radio - Wikipedia

    en.wikipedia.org/wiki/Digital_radio

    HD Radio (AM IBOC sideband) Digital Radio Mondiale (branded as DRM) for the short-, medium- and long-wave bands; FM band in-band on-channel (FM IBOC): HD Radio (OFDM modulation over AM and FM band IBOC sidebands) FMeXtra (FM band IBOC subcarriers) Digital Radio Mondiale extension (DRM+) (OFDM modulation over AM band IBOC sidebands)

  7. AM Stereo and Digital AM in and near the United States

    en.wikipedia.org/wiki/AM_Stereo_and_Digital_AM...

    This page was last edited on 22 February 2025, at 10:54 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

  8. Satellite radio - Wikipedia

    en.wikipedia.org/wiki/Satellite_radio

    Satellite radio uses the 2.3 GHz S band in North America for nationwide digital radio broadcasting. [6] MobaHO! operated at 2.6 GHz. In other parts of the world, satellite radio uses part of the 1.4 GHz L band allocated for DAB. [7] Satellite radio subscribers purchase a receiver and pay a monthly subscription fee to listen to programming.

  9. List of radio stations in North America by media market

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

    In the United States, radio stations are assigned callsigns that either start with K (for those located west of the Mississippi River), or W (for those located east of the Mississippi River). AM radio stations by call sign (starting with KA–KF)

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