The "classic zepp" antenna lives on in VHF circles, and is known as a J-Pole. Turn the Zepp vertically and you have a J-pole. The major difference is the J-pole feed - the 1/4 wave transmission line section is shorted at the bottom and teh 50 ohm feedline is connected up a bit where the impedance is 50 ohms.
73, Don W3FPR On 7/1/2012 5:40 PM, Ron D'Eau Claire wrote: > That was the beauty of the Zeppelin antenna (the true "Zepp") A half wave > radiator is end fed through 1/4 wavelength of open wire line. One side of > the line connected to the radiator and the other side connected to nothing > - just an insulator. Since very little current flows at the feed point, the > balance in the line is still good. The 1/4 wavelength of line converted the > high impedance at the radiator to a low impedance at the rig. Of course > that's only true at one frequency for a given length of radiator and feed > line. > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
