Dave, were you in LSB at the time? Reason I ask, if you centered that signal on USB it would 3k up from your LSB frequency, being about 3.585.
Assuming USB, that area is near a QRZ frequency* for ALE (automatic link establishment.) It's wider and seems to fit your description. Check out a vid I created and uploaded to YOUTUBE.com: http://www.youtube.com/watch?v=1cK_FGdu83s ... and let us know if that might be it. Intriguing mode and hope to use more of it. Just a little detective work here, so I could be wrong, but certainly love the hunt! f, k2ncc * http://hflink.com/channels/
