Impedance of open wire feeder using multi-strand wire?
But I take it that your picture still applies to single-core conductors,
and very fat conductors at that.
Correct.
With the feedline I have in mind, S=55mm and d=1.2mm, so S/d=27.5, which
is way off the end of the scale in your picture.
Then your approximation formula will be fine.
Steve G3TXQ
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