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intermediate frequency

noun, Radio.
the middle frequency in a superheterodyne receiver, at which most of the amplification takes place.
Abbreviation: if.
Origin of intermediate frequency
First recorded in 1920-25 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for intermediate frequency

intermediate frequency

(electronics) the frequency to which the signal carrier frequency is changed in a superheterodyne receiver and at which most of the amplification takes place
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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