[amsat-bb] Mystery Signal

During the FO-29 pass this morning I ran across this signal on 435.821 MHz. There was no Doppler so it is probably land based. It is amazing what you stumble across when using an SDR rather than a conventional receiver. It sounds like rtty or some other digimode. Any opinions on it.

http://www.tomdoyle.org/435821.mp3

tnx W9KE Tom Doyle