Channel spacing

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(′chan·əl ′spās·iŋ)

(communications) The difference in frequency between successive radio or television channels.


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The amount of bandwidth allotted to each channel in a communications system that transmits multiple frequencies such as fiber optics. It is measured as the spacing between center frequencies (or wavelengths) of adjacent channels. See guard band.

Channel Spacing in Optical Fibers
The first 10 Gbps example with 50 GHz spacing has a slight signal overlap, but with 100 GHz, there is none. The first example provides more bandwidth, but the overlap could be enough to cause significant crosstalk. (Illustration courtesy of Jeff Hecht.)

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Channel spacing is a term used in radio frequency planning. It describes the frequency difference between adjacent allocations in a frequency plan. Channels for mediumwave radio stations, for example are allocated in internationally-agreed steps of 9 or 10 kHz: 10 kHz in ITU Region 2 (the Americas) and 9 kHz elsewhere in the world.[1]

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