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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.
Several low-power television stations colloquially known as "Franken-FMs" operated primarily as radio stations on channel 6, using the 87.7 MHz audio carrier of that channel as a radio station receivable on most FM receivers configured to cover the whole of Band II, from 2009 to 2021; since then, a reduced number have received special temporary ...
The following channel 6 LPTV stations have been authorized to offer FM6 service, a version of the ATSC 3.0 digital TV standard that includes an FM analog signal receivable on standard radios at 87.75 FM. Map of US Low Power TV (LPTV) stations transmitting on TV channel 6, which are also authorized to transmit an FM signal at 87.7 MHz. California
Early efforts to transmit discrete four-channel quadraphonic music required the use of two FM stations; one transmitting the front audio channels, the other the rear channels. A breakthrough came in 1970 when KIOI ( K-101 ) in San Francisco successfully transmitted true quadraphonic sound from a single FM station using the Quadraplex system ...
All domestic (United States) AM stations are classified as A, B, C, or D. [1]A (formerly I) — clear-channel stations — 10 kW to 50 kW, 24 hours.. Class A stations are only protected within a 750-mile (1,207-kilometer) radius of the transmitter site.