"justme" wrote in :

Although the formulae did not copy properly, if one wants to help me
with this, they can go to the link below for the proper fomatting of
these formulae. I would really appreciate it.

Thank you.

j/b

....

I read all three posts, and it was a bit hard to understand your problem.

Firstly, the formulae on the Wiki page that use the log term are
approximations of the function using the cosh term, and the approximation
is poor for small S/d.

Have a look at the calculator at http://www.vk1od.net/calc/tl/twllc.htm ,
it uses the cosh term in its calcs. BTW, the metric equivalent of your
example is 2mm wires spaced 150mm.


Owen