
A television channel is a physical or virtual channel over which a television station or television network is distributed. For example, in North America, `channel 2` refers to the broadcast or cable band of 54 to 60 MHz, with carrier frequencies of 55.25 MHz for NTSC analog video (VSB) and 59.75 MHz for analog audio (FM), or 55.31 MHz for digit.....
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http://en.wikipedia.org/wiki/Television_channel

radio-frequency channel used for the transmission of the vision signal and the associated sound signals of a television programme
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=723-04-53
TV channel noun a television station and its programs; `a satellite TV channel`; `surfing through the channels`; `they offer more than one hundred channels`
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https://www.encyclo.co.uk/local/20974
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