And I've worked all over the world with 5 or 10 watts doing it :) Wayne
> On Aug 27, 2019, at 4:07 PM, Wayne Burdick <[email protected]> wrote: > > 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 <[email protected]> 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:[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]
