Jim Brown wrote on Monday, March 02, 2009, at 11:09 PM: > A few quibbles with your analysis. First, the antenna that I have > described is > a simple half wave dipole, fed at a current maxima. The only tricky part > is > the power rating of the choke that serves as the end insulator. My choke > is > NOT a matching element, it an end insulator!
If a resonant trap is placed at the bottom end instead of a choke as an insulator, whose coil is the outer of a coiled length of the feeder, with the trap's capacitor connected to the outer of of the coax at each end of the coil of coax, the phase relationship between two driven vertical dipoles can be fine tweaked over a limited range. The scheme that you use also makes feeding a half-square at a top corner from the bottom practical, without a separate feeder going to a top corner which could distort the antenna's pattern. 73, Geoff GM4ESD ______________________________________________________________ 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
