Hi Scott,
I never like to guess but take a look at this video showing RFI we tracked
down last year at W9RE and you will see similarities to what you are seeing
and you might also gain some info/insight on other characteristics to look
for in the demodulated audio spectrum.
https://youtu.be/yD7U-nH-AAg?si=Xrb7JPAByTj4NNKg
73,
Don wd8dsb
On Wed, Jul 31, 2024 at 5:31 PM K9MA <k9ma@sdellington.us> wrote:
> This RFI source has appeared recently:
>
> https://sdellington.us/hr/RFI/24.07.31.png
>
> It appears to be harmonics of about 78 kHz. However, unlike most SMPS
> RFI, it is very stable. It disappears at night, suggesting a solar
> system, but it persists, weakly, an hour or so after sunset. Maybe a
> solar system comm link, with a supercapacitor? However, I'm not aware of
> any new solar systems nearby. Anyone seen anything like this before?
>
> Needless to say, I'll be out tracking it soon.
>
> 73,
>
> --
> Scott K9MA
>
> k9ma@sdellington.us
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>
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