Oops.? My reply and comments were intended for Mehmet.?
I have some bands that have crazy-looking graphs like the ones he posted - even after I got them to complete all the way across.? But after they completed all the way across, the gross distortion was gone.
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Your note, Yun, about the 80m plot not finishing all the way across, but still you get good audio (after turning off the swap) - that shows that my theory is not the complete story, even though it has worked for me and a few others...