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I am 100% sure the noise does not originate in my house. It can be late evening, everything switched off, and still the noise persists, with a repetition rate of about 1.25 Hz. It is worst on 80 meters and varies in intensity with peaks at several frequencies. I will try to look at the peak spacing to ascertain more about it.
I now will have to find a portable radio capable of receiving 80 meters. I could strap my TS-440S over my shoulder and schlep a 12V battery but I'd get arrested for impersonating a terrorist.
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