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In the Americas (defined as International Telecommunication Union (ITU) region 2), the FM broadcast band consists of 101 channels, each 200 kHz wide, in the frequency range from 87.8 to 108.0 MHz, with "center frequencies" running from 87.9 MHz to 107.9 MHz. For most purposes an FM station is associated with its center frequency.
Commercial and Government Radio Stations of the U.S. (6/30/1927), pages 87–92 7/1/1927 Call letters: Annual Report of the FRC (6/30/1927), pages 55–64 11/1/1927 Frequency: Jurisdiction of Radio Commission (2/1928), pages 14–17 Frequencies from 600 to 1000 kHz 12/1/1927 Frequency: Jurisdiction of Radio Commission (2/1928), pages 10–12
Reliable radio control uses bands dedicated to the purpose. Radio-controlled toys may use portions of unlicensed spectrum in the 27 MHz or 49 MHz bands, but more costly aircraft, boat, or land vehicle models use dedicated radio control frequencies near 72 MHz to avoid interference by unlicensed uses. The 21st century has seen a move to 2.4 GHz ...
Narrow band Frequency Modulation was developed and demonstrated by Hanso Idzerda in 1919. Wide band Frequency modulation radio originated in the United States during the 1930s; the system was developed by the American electrical engineer Edwin Howard Armstrong. However, FM broadcasting did not become widespread, even in North America, until the ...
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Weather radio: the National Oceanic and Atmospheric Administration operates the NOAA Weather Radio service of over 1000 stations nationwide, operating on its own small designated 162 MHz FM band. Two way radio services take up most of the rest of the geomagnetic spectrum, including marine VHF radio, amateur radio, the aforementioned citizens ...
The band became famous after playing the Woodstock festival in 1969 and began the '70s with two #1 albums: 1970's "Abraxas" and 1971's "Santana III." In 1998, Santana was inducted into the Rock ...
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