Uh, I think you mean clamp-on's are a waste of money if configured in a single
pass on a cable....if you can do multiple turns, you're good.
Chris
KF7P
On Feb 10, 2017, at 15:42 , Jim Brown wrote:
Chuck,
I looked into this half a year ago when someone asked the same question. The
answer was no. I don't remember why.
Study my material on this topic. Below 5 MHz, we need multiple turns through a
#31 core. Between 5 MHz and 6M, we need multiple turns through #31 or #43.
Clamp-ons of either are a waste of money and do nothing at HF.
73, Jim K9YC
On Fri,2/10/2017 12:10 PM, Chuck Gooden wrote:
>
> 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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