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I'm sorry but i believe you're propagating a "can sometimes happen" into a virtual certainty. I once built a 2 element yagi that had 20-30 db of front to side and f/b ratio in all directions. It used no balun and was a killer antenna to Europe and Africa and South America. Lots of signals totally disappeared when to the side or rear of that antenna. Your computer modeling programs today say thats not possible. They also claim that feedline radiation is always a problem, it just isn't always so. If feedline radiation had been a problem with that antenna and with my present one, then it would manifest itself as skewed patterns and f/b f/s degradation. It doesn't. I'm still going to try my EB-1 on my C3SS. I stand by all i wrote and ,once again, i encourage others to experiment with both possibilities and decide for themselves and report their findings in appropriate amateur forums. 73 Roy WA4DOU ------------------------------------------------------------------------- ------------------------------------------------------------------------- ----------------------------------------------------------------------- On Mon, 15 Jan 2001 12:36:51 -0700 Ken Hirschberg <calav@flash.net> writes: > Hello, Roy - > 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 > > ________________________________________________________________ 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 |