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[RFI] Material 75 vs Material 31 Ferrites for EMI

To: Don Kirk <wd8dsb@gmail.com>
Subject: [RFI] Material 75 vs Material 31 Ferrites for EMI
From: Chuck Gooden <Chuck.Gooden@comcast.net>
Date: Fri, 10 Feb 2017 14:10:07 -0600
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
Fair-Rite has introduced a new low frequency material (#75), I was 
wondering if someone could comment if this new material would be better 
that #31 for EMI suppression.
According to the Fair-rite web site, #75 shows a higher impedance at 
lower frequencies than #31 but above ~2 Mhz the impedance drops off.  
While the impedance of #31 seems to continue to increase and the 
frequency goes up.
I am planning on ordering some snap-it cores  to reduce the noise from 
switch mode power supplies, and other sources, I am experiencing on HF 
bands.  I have already read the documents on the K9YC web site but there 
was no info on the new material.  I am tempted to stay with #31 due to 
it's long time use.
Thanks,

Chuck K9LC

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