[TowerTalk] Transmission Line Formula

[Richard (Rick) Karlquist]

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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