Wouldn't it be real simple to use a Line Flattner/"Antenna Tuner" to the single wire transmission line, fed against good ground, to a Windom that is close to resonant on most of the bands, get on the air and enjoy its properties?? 73 , K0NG .
Quoting Geoff/W5OMR <[EMAIL PROTECTED]>: > > In QST magazine for September 1929 the original Windom Antenna article > > starts on page 19. It clearly shows that it is exactly resonant on all of > > it's design bands, so long as there is an harmonic relationship. > 80-40-20-10 > > etc. There are diagrams included which show how this is determined with an > > RF ammeter and a rolling trolley after which very precise and repeatable > > formulas were derived. Of course this is the single wire fed version. The > > later 300 Ohm job is merely wishful thinking.The length in feet is always > > 468, divided by desired frequency in Kc. For the lowest desired band. The > > tap is always feet times 25 divided by 180. I might add that antennas put > up > > as temporary during this nasty winter weather last 20 to 30 times longer > > than summer installed permanent antennas. happy antenna experimenting. 73, > > K4XM, Mike. > > So, in order for this to work, you have to decide what frequency you're > going > to operate on, on the HIGHEST frequency the antenna will cover. > > ie: 29MC /2 = 14.5, 7.25, 3.625, 18.125Mc. > > that being the case, then > L = 468/f(L) > L = 468/18.125 > L = 258.20689655172413793103448275862 > > Now, you said that the 'tap is always feet times 25 divided by 180' > T = 258.207ft * 25 / 180 > T = 6455.17 / 180 > T = 35.862068965517241379310344827586 > > Single wire feeding it? Fed against Ground? Doesn't the single feed-line > then > become part of the radiating antenna? > > Even if someone were to take, say the output of a link and feed it directly > to > the > open wire feed-line, the open wire line would have to go all the way to the > feed > point of the antenna, wouldn't it? > > I'm sorry if I'm seeming a little dense, but I can't get unwrapped from the > 'single wire fed version' of this antenna. > > Open wire output from the link has *2* wires. I can see attaching them to > some > open wire line, and feeding this Wyndom antenna at 1.8125, and having the > antenna resonant on 3.6250, 7.250, 14.5 (oops - can't operate there) and > 29Mc, > but I simply fail to understand how one wire is going to feed an antenna > thas > has two posts to connect to. > > Certainly has me thinking, though. Now, if I could just come up with land > that > had 300' (for guy supports on both sides) > > I'll have to work CW on 3.6250, forget about 20m and enjoy a > multi-wavelength > antenna on 10m (when the band is open). Pardon the sarcasm ;-) > > > Seriously, here. Surely, there must be something I'm missing, to be able to > use > this antenna on all bands, with acceptable VSWR. > > 'Splain it to me, please. > > Happy New Year > > 73 = Best Regards, > -Geoff/W5OMR > > > ______________________________________________________________ > AMRadio mailing list > Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:[email protected] >
