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Re: [RFI] is there any hope for a new keurig single cup coffee machine/

To: Rfi List <rfi@contesting.com>
Subject: Re: [RFI] is there any hope for a new keurig single cup coffee machine/
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Fri, 26 Jul 2024 14:33:39 -0700
List-post: <mailto:rfi@contesting.com>
On 7/26/2024 12:35 PM, David Eckhardt wrote:
They are designed to attenuate both common mode and differential mode unwanted energy.

There's a problem with that statement. It's that what EMC Regs (and testing) calls common mode is not what Mother nature calls Common Mode -- that is, it creates a net current on the cable that causes it to act as an antenna -- that is, to radiate. The most effective suppression for that is a ferrite choke that is near resonance at the frequency(ies) of interest. I discussed that in later versions of k9yc.com/RFI-Ham.pdf so be sure to get it from my website.

73, Jim K9YC




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