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About: Incremental frequency keying     Goto   Sponge   NotDistinct   Permalink

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Incremental frequency keying, also known as IFK or IFK+, is a modified type of MFSK modulation where the data to be transmitted is represented by the difference in frequency between the previously received tone and the currently received tone. This modulation is used in the amateur radio data-modes DominioEX and THOR.