Andy, K0SM has a very nice look at the K3 reduced-bandwidth FSK keying.
(Now available to all as Beta DSP rev. 2.8.)
http://www.frontiernet.net/~aflowers/k3beta/
It is also interesting to look at before and after FSK signals in the time
domain.
https://picasaweb.google.com/StarrGarretson/2013_03_25_K3_FSK
K3 FSK has always had a small amplitude difference between mark and space.
The transition has always been abrupt, Photo 1. With the new beta software,
the transition is much more gentle, Photo 2. Bravo!
Diddle Exuberantly,
Hank, W6SX
Mammoth Lakes, California
Elevation 8083 feet in John Muir's Range of Light
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