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  2. 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 ...

  3. FM broadcasting - Wikipedia

    en.wikipedia.org/wiki/FM_broadcasting

    The use of FM for domestic radio encouraged listeners to acquire cheap FM-only receivers and so reduced the number able to listen to longer-range AM foreign broadcasters. Similar considerations led to domestic radio in South Africa switching to FM in the 1960s.

  4. Broadcast band - Wikipedia

    en.wikipedia.org/wiki/Broadcast_band

    FM radio: 87.5–108 MHz, 76–90 MHz in Japan Frequency Modulation (FM) VHF band II: Usually music, due to the clarity and high bandwidth of FM. Relatively short range VHF high (TV) 174–216 MHz vestigial sideband modulation for analog video, and FM for analog audio; 8-VSB or OFDM for digital broadcast VHF band III: Channels 7–13 use 174 ...

  5. List of 50 kW AM radio stations in the United States - Wikipedia

    en.wikipedia.org/wiki/List_of_50_kW_AM_radio...

    The following is a list of radio stations in the United States that are authorized to run 50 kW (50,000 watts) of power. This is the highest power authorized to any AM station in the United States. Power Legend: U=unlimited time, D=daytime power, N=nighttime power, CH= critical hours power.

  6. Medium wave - Wikipedia

    en.wikipedia.org/wiki/Medium_wave

    Typical mast radiator of a commercial medium wave AM broadcasting station, Chapel Hill, North Carolina, U.S. Medium wave (MW) is a part of the medium frequency (MF) radio band used mainly for AM radio broadcasting. The spectrum provides about 120 channels with more limited sound quality than FM stations on the FM broadcast band. During the ...

  7. Radio in the United States - Wikipedia

    en.wikipedia.org/wiki/Radio_in_the_United_States

    Most low-power broadcasting in the U.S. is on the FM band. 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 ...

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