Thanks Chris! I'm not sure exactly what I'm looking at here....severely waterfall challenged! When I first heard this mystery noise, I was listening on 6920LSB. It sounded the same on 6917 USB, but much clearer. Others heard it in the chat room and suggested it sounded like a FAX xmsn only much slower. The sound varied during the time I was listening. Was this screen shot from the time period mentioned in my posting?The waterfall boundary on the right seems to be minus a few kilohertz from 6917. I have a cassette recording of it (yes...I'm still digitally challenged here also!) When I finally get patched into my good PC, I'll see if I can digitize the tape and send a sample...strangest noise I've heard yet on 43 meters.