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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.
In Canada, the United States, Mexico, the Bahamas, etc., there are 101 FM channels numbered from 200 (center frequency 87.9 MHz) to 300 (center frequency 107.9 MHz), though these numbers are rarely used outside the fields of radio engineering and government. The center frequencies of the FM channels are spaced in increments of 200 kHz.
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 channel 200, 87.9 MHz, overlaps TV 6. This is used only by K200AA.; TV 6 analog audio can be heard on FM 87.75 on most broadcast radio receivers as well as on a European TV tuned to channel E4A or channel IC, but at lower volume than wideband FM broadcast stations, because of the lower deviation.
It had a very small audience and was shut down in 1961 ostensibly to clear the television band: TV channel 5 (102.250 video carrier) if allocated would fall within the VHF FM band (98–108 MHz). The official policy on FM at the time was to eventually introduce it on another band, which would have required FM tuners custom-built for Australia.
FM: The FM radio band was established on January 1, 1941, and from the beginning educational stations received standard unique four-letter call signs. Commercial stations within the original FM band were assigned transmitting frequencies that spanned from 43.1 MHz to 49.9 MHz, and the FCC initially issued these stations standardized call signs ...
0–9. 76.1 fm; 76.5 fm; 80.2 fm; 82.5 fm; 87.5 fm; 87.6 fm; 87.7 fm; 87.8 fm; 87.9 fm; 88.0 fm; 88.1 fm; 88.2 fm; 88.3 fm; 88.4 fm; 88.5 fm; 88.6 fm; 88.7 fm; 88.8 ...
That same year the standard FM broadcasting band was reassigned to 80 channels from 88.1 to 105.9 MHz, which was soon expanded to 100 channels ending at 107.9 MHz (channels 201–300). [11] [12] One additional FM channel, centered on 87.9 MHz (channel 200), was added in 1978. [13]