[600MRG] Fw: RFI identified

[Brian Pease]

Cavemen did not have RFI 
problems..................................................


On 1/6/2025 2:40 PM, Paul N1BUG FN55mf wrote:
> I know I am way behind on replies! I appreciate every comment that has
> been received in response to my RFI problems. Thanks everyone!
>
> I have that filter on the way for the refrigerator. I will let the group
> know how it goes with that.
>
> Meanwhile I made a discovery on another major source of RFI. I realized
> it was not only changing in amplitude when I turn certain lights and
> circuits on and off at the far end of the house (less RFI when things
> are ON) but also changing in frequency with changes in temperature in my
> home. I verified by turning the heat up and down. No doubt about it, it
> responds every time. That suggested the source is in my home and the
> only room I hadn't been able to power down was the ham shack. So I
> started testing things in here by warming them with a heat source. Most
> did not respond but when I injected warm air into the shack computer I
> got a very strong positive response. So it appears the source of that
> RFI is the computer. Not good, as I cannot run LF/MF without it.
>
> Hopefully the fact that lights and electrical loads at the other end of
> the house affect the level means it is getting out primarily through the
> computer power cord into electrical wiring and radiating from there. If
> so, there is hope that another line filter might help. Alternatively,
> perhaps replacing the computer power supply might help but that is a
> real crap shoot as so many of them are noisy.
>
> There are other sources as well. This may be a long road.
>
> Paul, N1BUG
>
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