So we've rediscovered the Gotham V80 Vertical! Steve Ellington [email protected] ----- Original Message ----- From: "Ron D'Eau Claire" <[email protected]> To: <[email protected]> Sent: Sunday, March 15, 2009 2:21 PM Subject: Re: [Elecraft] 43' Vertical and the K2 tuner
> Dr. Megacycle has it on the head with the length: 22 feet is 5/8 wave on > 10 > meters. > > Good "commercial" automatic tuners will feed such an antenna all the way > down below 80 meters. The SGC-230 is commonly used on ships feeding a 23 > foot whip all the way down to the emergency SSB frequency at 2182 kHz. > > Many published tests have shown that getting the radials away from the > ground is *very* beneficial and may well outweigh the loss of efficiency > in > reducing the height of the vertical. Back in '87, A. M. Christman, KB8I, > published the results of studies he conducted in the Proceedings of the > Third Annual Review of Progress in Applied Computational Electromagnetics > for the U.S. Naval Postgraduate School, which he later summarized for hams > in an article in the Aug 1988 issue of QST. That article is available to > ARRL members on their web site. It gives numerous examples of the > improvements to be expected as various counterpoise systems are used above > ground. > > Let me point out to anyone interested enough to read my previous post that > I > misspoke. It was kindly brought to my attention by Arnie, PA3A, who > observed > I said a half wave radiator has a high radiation resistance when I meant > to > say it had a high feed point impedance. My conclusion was correct as to > the > benefit of a high feed point impedance, but there's a huge difference > between the resistive value of the feed point impedance and radiation > resistance! > > Ron AC7AC > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html -------------------------------------------------------------------------------- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.0.237 / Virus Database: 270.11.13/2001 - Release Date: 03/14/09 06:54:00 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
