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

Jim Brown jim at audiosystemsgroup.com
Fri Jul 26 17:33:39 EDT 2024


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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