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I fully addressed this in my post! 73 Roy WA4DOU ---------------------------------------------------------------------- On Tue, 16 Jan 2001 07:59:44 +1300 "Barry Kirkwood" <bjk@ihug.co.nz> writes: > I would agree that it might well be possible to connect coax directly > to the > 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 > > ________________________________________________________________ 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 |