[TowerTalk] Transmission Line Formula

[Jim Lux]

Richard (Rick) Karlquist wrote:
> 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
> 

Might be incidental to the design (e.g. using the boom as one side of a 
transmission line and a wire as the other)  or if you are calculating 
something like induced couplings...

Jim, W6RMK