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LPF Question : in general #lpf

Al Szymanski
 

Good day all. One quick question : what is the rationale for the three toroids in many LPF's to have one be oriented at 90° to the other two? Is it to prevent the field of one interfering with the neighbor? E.G. #1 is oriented North South, #2 E-W, #3 N-S.
Thanks

Shirley Dulcey KE1L
 

You have it right. It is to decrease the amount of unwanted
electromagnetic coupling between nearby inductors. Toroids are often
described as self-shielding because the shape decreases the amount of
the electromagnetic field that extends beyond the coil, but it doesn't
eliminate it completely and so interaction with other fields is still
possible.
On Sun, Oct 28, 2018 at 2:13 PM Al Szymanski via Groups.Io
<aszy=mac.com@groups.io> wrote:

Good day all. One quick question : what is the rationale for the three toroids in many LPF's to have one be oriented at 90° to the other two? Is it to prevent the field of one interfering with the neighbor? E.G. #1 is oriented North South, #2 E-W, #3 N-S.
Thanks

Al Szymanski
 

Thank you very much. Al