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Re: [RFI] Question Regarding Variations In Solar Panel RFI?

To: "jim@audiosystemsgroup.com" <jim@audiosystemsgroup.com>, "rfi@contesting.com" <rfi@contesting.com>
Subject: Re: [RFI] Question Regarding Variations In Solar Panel RFI?
From: "Cianciolo, Paul, W1VLF" <pcianciolo@arrl.org>
Date: Mon, 28 Sep 2020 18:50:57 +0000
List-post: <mailto:rfi@contesting.com>
Hi Jim
I agree.

The real point of the email was if you know what the source of the noise is I 
would concentrate on that particular issue. Instead f wandering between 
inverter, optimizer, then inverter again.
A calibrated RF current probe could be put to good use in this case.


73,

Paul Cianciolo, W1VLF
ARRL EMC Engineer

ARRL - The national association for Amateur RadioT
225 Main Street, Newington, CT 06111-1400 USA 
Telephone: (860) 594-0392 
FAX: (860) 594-0259
Email: w1vlf@arrl.org
World Wide Web: www.arrl.org


-----Original Message-----
From: RFI <rfi-bounces+pcianciolo=arrl.org@contesting.com> On Behalf Of Jim 
Brown
Sent: Monday, September 28, 2020 12:01 PM
To: rfi@contesting.com
Subject: Re: [RFI] Question Regarding Variations In Solar Panel RFI?

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
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