For the technically inclined person interested in Automatic Threshold
Correction for FSK, I wrote a short note from back in 2008 that shows a small
"nit" with standard ATC and how it can be corrected:
http://homepage.mac.com/chen/Technical/FSK/ATC/index.html
The above page has a figure on what a Mark-only demodulator looks like (and
points out why Mark-only demodulation is better than conventional ATC if the
space signal has faded completely).
No, understanding the above won't help you get a better contest score :-) :-).
But you might be able to include it in the next modem that you build to get a
teeny weeny better copy for electively fading signals with really low SNR, HI.
73
Chen, W7AY
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