This morning I was listening on the 15m band with JT65-HF. Obviously some Japanese stations there. In parellel with JT65-HF i started Ham Radio Deluxe and soon I heard a noticeable difference in the white noise level.
|The waterfall picture shows the noise level difference with our without Ham Radio Deluxe main window.|
The first thing I found out was that when HRD-rig connection is cut off, the QRM stops. So, obviously the HRD software isn't the problem after all? :) Then it occurred to me: maybe the TS-850S USB interface could be the cause?
Later I found the solution: I moved the PC interface half a meter away from the rig and the noise disappeared!