On 10/31/2014 3:50 AM, Steve Hunt wrote:
If we had a good way to predict C, predicting the CM impedance of a
particular choke design would be relatively straightforward.
Variables include the turn spacing, the diameter of the choke, diectric
constant of the cable outer insulator, the dielectric constant of the
core material, and the portion of the winding influenced by both. The
dominant parameters are those associated with the windings and the air
dielectric. You can see this if you study the graphs of 1-14 turns of
small wire for the various core materials done by my anonymous
collaborator nearly 10 years ago. He chose to be anonymous because he
works in a well equipped scientific lab in a major institution, and
needs to avoid professional jealousies. :)
73, Jim K9YC
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