[RFI] Material 75 vs Material 31 Ferrites for EMI

[Chuck Gooden]

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