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## Re: [TowerTalk] Transmission Line Formula

 To: David Gilbert Re: [TowerTalk] Transmission Line Formula "Richard (Rick) Karlquist" Thu, 17 Apr 2008 21:53:53 -0700 mailto:towertalk@contesting.com>
 ```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 > > _______________________________________________ > > > > _______________________________________________ > TowerTalk mailing list > TowerTalk@contesting.com > http://lists.contesting.com/mailman/listinfo/towertalk > > _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk ```
 Current Thread [TowerTalk] Transmission Line Formula, David Gilbert Re: [TowerTalk] Transmission Line Formula, Richard (Rick) Karlquist <= Re: [TowerTalk] Transmission Line Formula, Jim Lux Re: [TowerTalk] Transmission Line Formula, Bob Nielsen Re: [TowerTalk] Transmission Line Formula, Richard (Rick) Karlquist Re: [TowerTalk] Transmission Line Formula, David Gilbert