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Suggest you measure the feed line over a length of half a wavelength to determine what currents are flowing on the outside. Then install the balun and repeat the measurement. If you find currents flowing on the outside of the feed line, then rest assured the pattern will be skewed. 73, Ken wa4dou@juno.com wrote: > 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 |