[RFI] Solar Edge RFI Update 11/29/18

[Michael Aust]

Supression goes up as turns squared on a single core
So not the same if you add 2 cores with a single wire
Thru it !


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On Thursday, November 29, 2018, Jim Brown <jim at audiosystemsgroup.com> wrote:

On 11/29/2018 11:13 AM, Andy KU7T wrote:
> All,
>
>
>
> Is it the same to use 5 cores and just clamp them on a cable one after another compared with using one of the same cores and wrapping the cable 5 times through? I would think yes. Is this true?


NO! NO! NO! Not even close.

Study k9yc.com/RFI-Ham.pdf

73, Jim K9YC


>
>
>
> (I am asking because I am doing some RFI suppression work on my heating system and may go the easy route of just clamping on a couple…)
>
>
>
> 73
>
> Andy
>
> KU7T
>
>
>
> Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10
>
>
>
> ________________________________
> From: RFI <rfi-bounces at contesting.com> on behalf of Tony <dxdx at optonline.net>
> Sent: Thursday, November 29, 2018 11:05:03 AM
> To: Rfi List
> Subject: [RFI] Solar Edge RFI Update 11/29/18
>
> All:
>
> Solar Edge installed RFI suppression on my neighbors solar system on
> Monday. They installed 5 clamp-on Ferrites on half the Optimizers which
> left the rest of the system open to RFI. Needless to say, this did
> little to suppress the noise.
>
> The company will not wrap cables around large cores because they say
> that doing so would violate the cables bending radius and could lead to
> cracks. I spoke to the engineer today and he maintains that using
> several clamp-on Ferrites is the equivalent of wrapping the cable around
> a core.
>
> So that's where we are. I should find out the next course of action this
> week. I'll keep the group posted.
>
> Tony -K2MO
>
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