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## Re: [TowerTalk] Transmission Line theory

 To: towerTalk List Re: [TowerTalk] Transmission Line theory Bob Nielsen Tue, 1 Jul 2008 15:18:40 -0700 mailto:towertalk@contesting.com>
 ```I recall an excercise in graduate EM class I took many years ago. You draw the geometry and break it up into squares. Each square has an impedance of 376.7 ohms in free space and you calculate the charactistic impedance by connecting them in series or parallel. A bit time consuming, but it works for arbitrary configurations. The prof had a question on the mid-term where he made a meant to have a coax with an off-center center conductor and we had to calculate the impedance with this method. He made a mistake and the dimensions given resulted in the center conductor being shorted to the outer conductor. My answer of "zero ohms (by inspection)" only got me half- credit. Bob, N7XY _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk ```
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