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## Re: [TowerTalk] Transmission Line theory

 To: "Paul Baldock" Re: [TowerTalk] Transmission Line theory "Rick Karlquist" richard@karlquist.com Tue, 1 Jul 2008 12:34:20 -0700 (PDT) mailto:towertalk@contesting.com>
 ```Your best bet is to determine the characteristic impedance for the corresponding microstrip line, and double it. The height above ground plane will be half of the conductor to conductor spacing of the open wire line. Here is a calculator for microstrip: http://chemandy.com/calculators/microstrip_transmission_line_calculator.htm If you have a line with 20:1 ratio of conductor spacing to conductor diameter (round wires) compared to the same line with square wires, where the square wires have the same cross sectional area as the round wires, the square conductor line has 3.5% more impedance, 410 vs 395 ohms. At least according to this calculator. Rick N6RK Paul Baldock wrote: > Does anybody know the formula for calculating the characteristic > impedance of a transmission line consisting of 2 parallel square > conductors (in air)? > > Thanks > > - Paul KW7Y > > _______________________________________________ > > > > _______________________________________________ > 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 ```
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