On Fri, Jul 15, 2016 at 12:24 PM, Fred C. Jensen <[email protected]> wrote: > (End Fed On 80 But Works Great On Other Bands Too). :-)
One of the endearing qualities of an 80 meter end-fed half-wave L is that it is usually a very good antenna for both 7 and 10 MHz. If the bend of the L is somewhere close to the middle of the wire, as in up 55 out 75, up 70 out 60, we get some interesting if counter-intuitive effects. On 40 the wire acts like a 40 dipole hung in the same air space. Due to the interaction of the vertical and horizontal parts of the L, the vertical wire becomes a single wire feedline. Very easy to model. Try it and get used to the idea that to the naked brain that doesn't make any sense. On 30m the pattern is a low-ish angle omnidirectional. Since it is a high Z feedpoint on all three bands, one half-wave on 80, two on 40 and three on 30, the use of pathetic ground is permitted at the feedpoint. If you add the switching and an FCP, this becomes a very efficient antenna for 160-80-40-30. Use of the pathetic ground on 160, since that is a *current* feed rather than a voltage feed will produce a pathetic 160 radiated signal. 73, Guy K2AV ______________________________________________________________ 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]
