[RFI] Question Regarding Variations In Solar Panel RFI?

[Jim Brown]

On 9/28/2020 7:23 AM, Cianciolo, Paul, W1VLF wrote:
> In addition I have a Corcom 25fc10 installed at my home.  See the data sheet and response curves here.http://www.farnell.com/datasheets/1430489.pdf
> The filter makes a barely detectable change in the any received RFI I have from the SE system.

Hi Paul,

Conventional line filters are often ineffective against RF noise coupled 
onto power wiring because the noise current is usually on the Green 
wire, and the Green wire passes through them. These filters are actually 
two differential filters applied to the Phase and Neutral conductors 
plus a common mode filter applied to Phase and Neutral. They affect only 
what's conducted to Phase and Neutral.

That current gets onto the green wire because it is not terminated 
properly within the noisy equipment. It's the Mains Power equivalent of 
what engineers in the pro audio world call "the Pin One Problem."

This is why common mode chokes formed by winding multiple turns of all 
three conductors around suitable ferrite cores suppress common mode 
current, while conventional line filters fail to do so. For suppression 
at HF, Fair-Rite #31 material is the weapon of choice. Indeed, what EMC 
regulations call common mode is not what we as radio engineers would 
call common mode!

http://k9yc.com/Pin_1_Revisited.pdf
http://k9yc.com/Pin_1_Revisited_Part_2.pdf
http://k9yc.com/KillingReceiveNoise.pdf

Your photos didn't come through -- this reflector is plain text only.

73, Jim K9YC