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I have scanned the frequency range for which I have equipment and found what appears to be the fundamental frequency of this noise. It's right at about 300 kHz. It seems to vary a little and has a component at 295 kHz and another at 305 kHz, more or less (it's so raspy that it's hard to decide where it begins and ends).
So now the question arises, what sort of signal is this? Is it a noise from something other than radio gear, or is it a particular noisy source for radar or something?
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