Several years ago, May of 2013 in fact, I set out to create a "skimmer" for PSK31. A skimmer is a computer program that listens to all of the conversations it can hear and decodes all the data. After messing with it for a while, and not having much luck, I set it aside. Until a couple of weeks ago, that is. Ed Manuel N5EM gave me some of his old QEX's, and one of them had an article on PSK31 written by the guy who invented it. He talked about how his PSk31 detector worked, and gave me some ideas on how to improve what I'd written.