Because? Have a great day! Bill J K9YEQ
________________________________ From: Elecraft <[email protected]> on behalf of Wes Stewart <[email protected]> Sent: Tuesday, February 28, 2017 11:37:13 AM To: [email protected] Subject: Re: [Elecraft] 80 Meter Verticals Ted, You need to read W7XC's (SK) article in QST Mar 1990, pp 26-30 On 2/27/2017 4:13 PM, Dauer, Edward wrote: > A question that’s admittedly a bit OT – though if I need a pretext, the rig > to be used is a K3 . . . > > I have been reading through the usual texts about vertical antennas for 80 > meters, to replace the half wave dipole I now have and the Vee I had but > didn’t like. But I have not yet found the answer to one question I am > thinking about: The advantages or disadvantages of an inverted L compared to > other variations of the top-loaded vertical. > > Assume a 40-foot ground-mounted vertical section made with wire running up a > fiberglass mast. There could be a remote tuner or balun at the base if it’s > needed. The top of the vertical section would be guyed with four lines more > or less parallel to the earth extending from the top tip of the vertical > section to four suitably located trees. That physical configuration offers > three kinds of options. > > One is an inverted L. One of the four guy lines would be a wire making the L > and long enough to have the overall antenna resonate, with nonconductive line > from there to the tree. The other three guy lines would be nonconductive for > their entire length. > > Another would be the classic top-loaded “T” vertical. Two opposing guy lines > would be equal-length wire out far enough to achieve resonance, with the > other two nonconductive for their entire length. > > A third would be something closer to a capacity hat. All four of the guy > lines would start at the tip as wires, of equal length and just long enough > to effect resonance, with nonconductive rope from there to each of the four > trees. This variation might also have a square loop connecting the distal > ends of the four top wires. > > If the goal is to have the highest efficiency and the lowest net radiation > angle, and if the height of the vertical section is fixed and the radial > system is the same for each choice, does it matter which of those three or > four options is chosen? And if it does, how come? > > Thanks in advance for any lessons offered . . . > > Ted, KN1CBR > ______________________________________________________________ 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] ______________________________________________________________ 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]
