Kendall effect
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The Kendall effect is a term used in telecommunications to describe a spurious pattern or other distortion in a fax (facsimile record copy).
It is caused by unwanted modulation products which arise from the transmission of the carrier signal, and appear in the form of a rectified baseband that interferes with the lower sideband of the carrier.
The Kendall effect occurs principally when the single-sideband width is greater than half of the facsimile carrier frequency.
See also: List of fax terms