On Thu, Oct 10, 2019 at 2:06 PM Fred Jensen <k6...@foothill.net> wrote:
> Yes, however ... a center-fed dipole long enough to be moderately close > to a half-wave at 40 will develop a serious case of acute lobe-itis when > operated at higher frequencies, squirting your RF in a variety of > directions, many of which may not be productive for your intended > objective. Try, as many have over the years, to design the "magic > antenna" that is very small, provides a 1:1 match on all bands, easily > installed, and exhibits good gain, your effort will inevitably fail. As > JC Maxwell is reported to have said, "Physics is physics, the rules are > unbreakable." A log-periodic will give very modest gain over an octave > or more, however LP's hardly fall into the Field Antenna class. [:-) > > 73, > Fred ["Skip"] K6DGW > Sparks NV DM09dn > Washoe County > > On 10/10/2019 1:24 PM, Al Lorona wrote: > > My experience with single vertical or sloping wires is exactly the same > as AB7E's. I have, over almost twice as many Field Days as Dave, come to a > similar conclusion, with the slight difference being my preference for an > "all-band dipole" fed with balanced line. This obviates the balun and > reduces feedline loss to negligible, so obviously I am maximizing > efficiency at the expense of any other possible advantage. (I can usually > hear much better than I can be heard... so thus far this has been a valid > decision.) > > > > To sum up what I and what I think Dave are saying, you can't beat a > horizontal, center-fed wire up as high as you can get it. Its simplicity, > the flexibility it gives you to QSY (with a good tuner), and its high > efficiency are almost unbeatable. > > > > As a side note, the center-fed horizontal wire I have used here at home > is totally non-resonant. I don't even know how long it is. Once you give up > the obsession with resonant antenna length, you gain a huge freedom of > choice. > > > > In the bottom of the sunspot cycle, these advantages are somewhat > reduced because an op, especially on Field Day, might opt to forget about > any band higher than 20 meters -- and these days even 20 is questionable. > This means you can probably make do with coaxial cable and a balun for > operation on 2 or 3 bands but the general idea still holds. > > > > Al W6LX > > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to seatools.w...@gmail.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
