I want to try and build an HF two Element Vertical Antenna for 20 meters. While there are several java scripted web-sites that will calculate and provide the physical measurements for the Driven, Reflector elements and spacing.
I would like to use my MJF-259 to complete the fine tuning during construction and given that the frequency of the Driven element will not be the resonant frequency of the reflector. What would a good equation be to determine the resonant frequency for the reflector based on the desired frequency for the Driven element? Some references that I have found state the Reflector is approximately 4% longer than the Driven and the Director is 4% shorter, with element spacing 0.15 to 0.25 of the desired freq. I would like something a little more specific. Not that I can build it to spec or that the MFJ259 will be that accurate, I would still like to work with figures that provide something other than approximate. 73 K2CG Chuck G. _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
