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## [TowerTalk] Driving Point Impedance

 To: [TowerTalk] Driving Point Impedance jimlux@earthlink.net (Jim Lux) Wed Feb 12 23:18:00 2003
 Just to check ballpark Mutual Z numbers.. for dipoles in free space >From Kraus, 2nd Ed, page 427 for halfwave dipoles in free space .25 lambda R21= 40.9 .5 lambda , -12.7 .75 lambda, -24.8 (@ 0.7 lambda) to -18.6 (@0.8 lambda) Reading off the graph on page 426 @ .25 lambda X21 = 37-j35 @ 0.5 lambda -12-j27 @ 0.75 lambda -22+5j ----- Original Message ----- From: "Denis" To: Sent: Wednesday, February 12, 2003 7:27 PM Subject: [TowerTalk] Driving Point Impedance > I have a four in line vertical array for 80 meters that is in > construction. The verticals are .25 wavelength long and the seperation > is .25 wavelength. Each has 50 .25 wavelength radials. > > I have measured all the self impedances and the coupling iimpedances > and from that I have calculated the mutual impedances and the driving > point impedances. > > The driving point Z are as follows: > > Vertical 1 13 - j17.2 > Vertical 2 17.5 + j5.7 > Vertical 3 36.4 + j21.5 > Vertical 4 80.4 + 60.5 > > I have seen numbers for a 3 in line array but no field values for a 4 in > > line array. I was wondering if any one has built and > measured/calculated the Driving point Z so I could see if I was in the > ball park. > > Denis Ve6AQ / VE6FI > > > > _______________________________________________ > > See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA. > > _______________________________________________ > TowerTalk mailing list > TowerTalk@contesting.com > http://lists.contesting.com/mailman/listinfo/towertalk
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