K7ITM wrote:
Ahem. In your formula, e is the relative dielectric constant of the
dielectric between the planes and surrounding the wire, NOT the base of
natural logarithms. And I assume that "p/h 0,75" should be d/h
0,75. Then it's equivalent to what I posted earlier.

Cheers,
Tom

Ooops! - I just knew I'd get it wrong somewhe}
Yes, I meant to say d/h as that was the formula in "Reference Data for
Radio Engineers". Didn't see your post.
Must be the weather here - snowing!
Alan