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centre of a dipole and get good results. On the other hand one could also end up with "antenna effects" where the feedline itself becomes a radiator (see any antenna manual). At best a balun should eliminate this problem in the majority of situations. A balun can make things worse, especially if it is a bit reactive. A while back I innocently installed a ?W2AU balun on a Force 12 3C-S and had problems with SWR on 10m. Simple coax coil balun solved the problem. Presumably F12 antennas have been checked out with F12 baluns by the manufacturer... 73 end Barry Kirkwood PhD ZL1DD Signal Hill 66 Cory Road Palm Beach Waiheke Island 1240 NEW ZEALAND www.waiheke.co.nz/signal.htm ----- Original Message ----- From: <wa4dou@juno.com> To: <Force12talk@qth.com> Sent: Tuesday, 16 January, 2001 7:37 AM Subject: Re: [Force 12 Talk] C-31XR Balun ... > Hello Frank and the gang, > While considerable debate still attaches itself to the whole subject of > baluns, i'd like to remind folks, especially those who run considerable > power and have one or more failures associated with their use, that it > has hardly been demonstrated that baluns are necessary in many instances, > despite the fact that the "benefit" of the use thereof is conducive to > near perfect theoretical performance in the mind of the user. > I have a F12 C3SS on a 53 ft. tower and have used it for nearly a year > without any balun whatsoever. During most of that time, i've had a Cal-Av > EB-1 balun which i intend to install in the Spring. Then i'll have a > "baseline" with which to judge the performance and necessity of using a > balun in my particular installation. So far, my impression of my antennas > f/s and f/b performance is consistent with the performance expectations > of a typical 2 element yagi. > I have had other yagis and quads with which i've sometimes used baluns > and sometimes not. I've even experienced 2 element yagi performance > (without benefit of a balun) that far exceeded theory on both f/b and f/s > in all directions. And i've definitely seen occasions where baluns were > desirable and did effect positive results. > That said, i'd like to encourage users and potential users to suspend > judgement and to evaluate their antennas, with and without and report > their findings in various appropriate forums. Efficiency dictates that > the simplest installation that achieves the desired result is always to > be desired. As a radio communications technician and ham of 39+ years, i > believe i'm capable of making accurate scientific observations in this > case. > 73 de Roy Lincoln WA4DOU > ------------------------------------------------------------------------- > ------------------------------------------------------------------------- > ----------------------------------------------------------------------- > > ________________________________________________________________ > GET INTERNET ACCESS FROM JUNO! > Juno offers FREE or PREMIUM Internet access for less! > Join Juno today! For your FREE software, visit: > http://dl.www.juno.com/get/tagj. > > > -------------------------------------------- > Force12Talk mailing list provided as a service by Force 12 Antennas, Inc. > Force 12 Web site: http://www.qth.com/force12 > > Submissions: send to Force12Talk@qth.com > To unsubscribe: send a blank e-mail to Force12Talk-leave@qth.com > Force12Talk Message Archive: http://www.qth.com/force12/list/force12talk > For problems with the list, contact n4zr@qth.com > > > -------------------------------------------- Force12Talk mailing list provided as a service by Force 12 Antennas, Inc. Force 12 Web site: http://www.qth.com/force12 Submissions: send to Force12Talk@qth.com To unsubscribe: send a blank e-mail to Force12Talk-leave@qth.com Force12Talk Message Archive: http://www.qth.com/force12/list/force12talk For problems with the list, contact n4zr@qth.com |