[RFI] New RFI Source

[K9MA]

Hi Don,

That looks very much like the signal I'm seeing.  I'm pretty sure it's 
some kind of comm system, as I can see what looks like modulation of the 
broad sidebands. They vary both in amplitude and spacing to the central 
cluster.

I am seeing the signal only on 20 meters, and it's not nearly as strong 
as the one you and Mike saw, so it might be much further away.

Were you and Mike ever successful in finding the source?

73,
Scott K9MA

On 7/31/2024 9:45 PM, Don Kirk wrote:
> 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 at 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 at sdellington.us
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>

-- 
Scott  K9MA

k9ma at sdellington.us