On 12/7/2017 11:23 AM, David Robbins wrote:
Air core coils are of questionable value as common mode chokes, for
reasons I articulated in k9yc.com/RFI-Ham.pdf
The better solution is a ferrite core choke with balls. :)
Air core is better than cracked ferrites and melted coax in those little pvc
cans!!
That's not what I suggested.
And can be done quickly with materials at hand without having to
worry about getting enough ferrite mass to handle whatever burned up those
supposed 3kw rated 'baluns'.
Read the tutorial, David. A coil of coax that doesn't burn up is a good
thing, but it should also work as a choke. A coil of coax may or may not
work, depending on the rest of the common mode circuit. By "work" I mean
killing the common mode current on the coax that fills in the nulls of
the pattern and couples RX noise.
73, Jim K9YC
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