I am trying to find the best way to build RF inductors in the range of 5-50
uH and the lowest possible losses. They are for use at KW+ power levels, such
as might be found in tank circuits and antenna matching networks.
I would like to hear any opinions. enlightened or otherwise, in response to
the following question. For a particular inductor, for use at 3.5MHZ, the
nominal required coil data is 12turns of #12 wire on a 1.5" form, close wound
(about +j100 at 3.5). What would be the difference between winding with #12
magnet wire vs. a Litz weave having the same copper cross section, using
conductors of approx. 10% of the DIAMETER of the #12 (about .052"). I would
like to know approx. how much difference there would be in the RF resistance,
since the coil carries the full antenna current+. Any loss in the coils
(there are several) subtracts directly from overall antenna gain so it is not
a trivial issue.
I have found a way to make the Litz wire to my own specs as needed, but don't
have much to go on for its theoretical performance. I don't recall ever
seeing any of any value. Have you??
Eric von Valtier K8LV
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