Hi Pete, Take a look at this article on helix ground planes: <http://www.alzacomm.com/downloads/Helix_Letter.pdf>http://www.alzacomm.com/downloads/Helix_Letter.pdf
It is also possible to make a helix with no ground plane. This was a cover article of the IEEE Antennas magazine in 1995. Search for the article Kraus, J.D. A helical-beam antenna without a ground plane. IEEE Ant. Prop. Mag., 37 (2), 45, 1995. at <http://ieeexplore.ieee.org/Xplore/guesthome.jsp>http://ieeexplore.ieee.org/Xplore/guesthome.jsp You have to buy this one from IEEE if you are not an APS member. Best of luck with your projects! 73, Tony AA2TX --- At 08:51 PM 6/3/2010, Pete Norris, K1HZU wrote: >Hi All: >I am rebuilding a 440 MHZ Helix that I built several years ago . It >worked very well, but I would like to reduce the size of the >reflector to a more manageable size than I had before. The only >reference to reflector size I can find is, "minimum 20" ". I may be >looking in the wrong places. I would appreciate it, if someone would >steer me in the right direction. >Thanks, >Pete, K1HZU > > > > >_______________________________________________ >Sent via amsat...@amsat.org. Opinions expressed are those of the author. >Not an AMSAT-NA member? Join now to support the amateur satellite program! >Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb _______________________________________________ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
