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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.
Therefore, in effect, the FM broadcast band comprises only FM channels 201 (88.1 MHz) through 300 (107.9 MHz). Originally, FM stations in a market were generally spaced four channels (800 kHz) apart. This spacing was developed in response to problems perceived on the original FM band, mostly due to deficiencies in receiver technology of the time.
FM station class Reference (maximum) facilities for station class (ERP / HAAT) FM protected or primary service contour Distance to protected or primary service contour Distance to 70 dBu city-grade or principal community coverage contour Class A 6 kW 100 m (328 ft) 60 dBu (1.0mV/m) 28.3 km (17.6 mi) 16.2 km (10.1 mi) Class B1 25 kW 100 m (328 ft)
List of FM radio stations in the United States by call sign (initial letters KG–KJ) List of FM radio stations in the United States by call sign (initial letters KK–KM) List of FM radio stations in the United States by call sign (initial letters KN–KP) List of FM radio stations in the United States by call sign (initial letters KQ–KS)
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)
The following is a list of full-power non-commercial educational radio stations in the United States broadcasting programming from National Public Radio (NPR), which can be sorted by their call signs, frequencies, band, city of license and state. HD Radio subchannels and low-power translators are not included.
Technologies are available that allow for switching to a different signal carrying the same radio program when leaving the broadcast range of a station. Radio Data System allows for switching to a different FM or station with the same identifier, or even to (but not necessarily from) an AM station. Satellite radio also is designed to switch ...
FM broadcasting is a method of radio broadcasting that uses frequency modulation (FM) of the radio broadcast carrier wave. Invented in 1933 by American engineer Edwin Armstrong , wide-band FM is used worldwide to transmit high-fidelity sound over broadcast radio . [ 1 ]