A dipole has two elements. An end-fed half-wave is a monopole. One element.
A half-wave antenna is still a half-wave, whether it is center fed (Hertz) or end fed (Marconi). wunder K6WRU Walter Underwood CM87wj http://observer.wunderwood.org/ (my blog) > On Feb 11, 2017, at 1:46 PM, Don Wilhelm <[email protected]> wrote: > > Ray, > > I think that is 'stretching' the facts a bit. > A halfwave dipole is a halfwave dipole whether fed at the center or at an end > or somewhere in between. > The radiation pattern and efficiency is the same. > The problem is that an end fed resonant dipole does need a little bit of a > counterpoise (0.05 wavelength) in order to be able to feed it properly. > > 73, > Don W3FPR > > On 2/11/2017 4:07 PM, Gmail wrote: >> As was said previously, all end fed antennas are monopoles with >> displacement current flowing from the antenna element to earth. Unlike >> dipoles where the displacement currents flow from element to element. >> So without an adequate radial system to reduce the ground loss all end Feds >> regardless of length are only about 10% efficient. >> There are good reasons why 45 years ago when coax became readily available >> we switched from endfed monopoles to dipoles. > ______________________________________________________________ > 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 > Message delivered to [email protected] ______________________________________________________________ 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 Message delivered to [email protected]
