This is an article that I wrote for QEX Exchange. It appeared in Issue No. 153, November 1994, p:3-10. (ISSN:0886-8093 USPS 011-424).

There have been lots of discussion of practical, real-world FSK demodulators in the past. The FM discriminator and filter-type approaches both appeared in classic HF modems and have their following. There are subtle differences though; matching demodulator filter shape to transmitted signal characteristics has advantages -- chiefly the ability to reduce some in-band interference. For additional background on this type of "matched filter" type of design see.

QEX article text

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