Mark, I had a noise problem too. I just new it was the next door neighbor's solar panel! With the P3 set to visualize the noise, I went around the house unplugging stuff. As it turned out, the noise was being generated by a cheap replacement laptop power supply! It's the old story of out of sight, out of mind. Gary at Elecraft ALSO suggested using a portable AM/FN radio set to maximum of the interference and doing a walkthrough. Keep the antenna horizontal and rotate the direction to find "hot" spots. It works! Good luck and 73, Fred, AE6IC
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