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Old October 28th 10, 10:42 PM posted to rec.radio.amateur.antenna
steveeh131047[_2_] steveeh131047[_2_] is offline
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Default 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