Was looking for the old Sally signal this morning, which I think may be the same as this Saline Valley Ditter, when I noticed another signal up higher on the Argo screen. I have it, a ditter every 3.3 seconds, or about 18 dits a minute, on 5207.439 around 1500 utc. I guess it could be the same one you were hearing and the freq moves that much with temp and voltage changes? Will have to look for it in the mornings again.
mark-n-nut