I'm generally walking when I use the AX1 (pedestrian mobile, or /PM). It isn't possible to elevate the radial under these circumstances; it drags on the ground. The whip is the radiator.
Wayne N6KR > On Aug 27, 2019, at 3:05 PM, David Gilbert <xda...@cis-broadband.com> wrote: > > > I'll try not to beat this into the ground here, but I think the physics here > is important. > > As K9YC said in his reply to you, equal currents go in both directions from > the feedpoint ... to the AX1 and to the counterpoise wire. That's simply > physics, and it's true unless currents on the shield of the coax cause > imbalance ... in which case the coax is doing a bunch of radiating. > > Now then, what is important is what happens to those equal currents. It > doesn't matter if one side of the feedpoint is the AX1 or if it is the > "counterpoise" wire ... they are both simply loads as far as the feedpoint is > concerned. Read that again ... it is THE critical concept. > > Current generates a radiated field. That is simple physics. Resistive loss > dissipates energy instead of radiating it. That is also basic physics. To a > lesser extent, current distributed over a longer length is a more effective > radiator than a shorter length even disregarding impedance concerns. > Consequently, a short, lossy "load" is going to radiate less RF than a > longer, less lossy "load". Straighter is better than snaky. All of that is > fact. > > Unless you have a very short counterpoise wire it is going to try to do a > better job of radiating RF than the AX1 if you give it a chance. Keep it as > straight as possible and keep it clear of ground and other RF dissipating > structures. > > That doesn't mean that the AX1 isn't serving a very useful purpose. It is. > It is allowing you to feed current into the "counterpoise" wire with a > reasonable feedpoint impedance. That's critical. But it doesn't mean that > the AX1 is doing the bulk of the radiating unless you aren't using a > counterpoise at all. > > Hope this helps. 73, > Dave AB7E > > > > > On 8/27/2019 2:29 PM, Grant Youngman wrote: >> >> I’m not saying that an elevated counterpoise won’t work with the AX1, just >> that I’m having trouble getting my head around considering the wire as the >> main radiator, and the AX1 as a counterpoise??? >> >> Grant NQ5T >> KX3 (8342)/KXPA100 >> >> > > ______________________________________________________________ > 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 n...@elecraft.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
