When I studied engineering (back when Marconi was a lad), a "dipole" was defined as a 1/2 wavelength radiator. I realize that definition has softened over the years, especially in the minds of Hams. Even engineering articles often refer to a non-1/2 wavelength radiator as a "dipole" nowadays. That's why I offered the comment to clarify that you were talking about a 1/2 wave radiator.
73 Ron AC7AC -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Don Wilhelm Sent: Sunday, July 01, 2012 3:26 PM To: [email protected] Subject: Re: [Elecraft] Counterpoise vs ground wire ? Actually Ron, the pure form of "dipole" is an antenna with two ends, but typical usage refers to the half wavelength. Yes, I did mean a 1/2 wavelength dipole - sorry for not being specific. 73, Don W3FPR On 7/1/2012 5:40 PM, Ron D'Eau Claire wrote: > Note that Don said " RF Ground will be that point of zero RF voltage - > in a balanced dipole, it will be present right at the middle of the > center insulator." > > "Dipole" is the important word, meaning a radiator 1/2 wavelength > long. A full wave center fed antenna (two half waves in phase) will > have a voltage loop - high impedance point - at the center of the center insulator. > > As the center fed antenna is made shorter than a 1/2 wave, the > impedance at the center also rises. Think of it as "stuffing part of > the antenna down the feed line" to make up a 1/2 wave. > > 73, 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 > ______________________________________________________________ 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 ______________________________________________________________ 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
