On 6/6/2021 1:48 PM, Charles Plunk wrote: > Looking at on audacity and listening too I am guessing 60/120hz power > arc. But then again I have had so much of it in the past I hear it in my > sleep, lol. In general, RF spectra and waterfalls are FAR more useful in identifying possible sources of RFI. See the tutorials on my website. k9yc.com 73, Jim K9YC