It is in Reference Data for Radio Engineers, Chapter 24, configuration N.
Zo = [60/(epsilon^.5)]* ACOSH {[4D^2/d1d2  d1/d2 d2/d1]/2}
where epsilon is relative dielectric constant
D is center to center spacing
d1 and d2 are the wire diameters
ACOSH is inverse hyperbolic cosine
Of course I wonder why would anyone deliberately use different diameters?
Rick N6RK
David Gilbert wrote:
> The formula for calculating the characteristic impedance of a parallel
> wire transmission line is readily available for the case where the
> conductor diameters are equal, but can anyone point me to a formula or
> online calculator for the case where the conductor diameters are not
> equal? I could have sworn that the ARRL Antenna Book once had it, but
> so far I have been unable to find it either there or anywhere online.
>
> Thanks in advance,
> Dave AB7E
>
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