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Re: [TowerTalk] Transmission Line Formula

To: "Richard (Rick) Karlquist" <>
Subject: Re: [TowerTalk] Transmission Line Formula
From: Jim Lux <>
Date: Thu, 17 Apr 2008 21:56:13 -0700
List-post: <">>
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

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