Guys - lots of very good info here, but we are beating this into the ground.
Lets end thread thread for now in the interest of maintaining a reasonable list SNR. ;-) Go out and operate, experiment with antennas, including the AX1, and see what has been discussed in this thread is best for you in your operating situations. And of course, have fun! 73, Eric Moderator, Mooderator and sometimes, List Therapist.. elecraft.com --- Sent from my iPhone 6S > On Aug 27, 2019, at 4:28 PM, David Gilbert <xda...@cis-broadband.com> wrote: > > > What makes you think the wire isn't doing the bulk of the radiating just > because it drags across the ground? Actual RF ground is usually some > distance below the surface, sometimes several feet. > > There is a way to prove me wrong on all of this. Connect two AX1's to a Tee > connector coming directly out of the rig. Position them vertically so that > they act like a vertical dipole. Use the rig's antenna tuner to make sure > full power is getting to the combination. Have somebody measure the signal > strength at different positions around a circle some distance from the > rig/antenna. > > Now replace the lower AX1 with the recommended 13' piece of wire, again using > the antenna tuner to hopefully feed the same amount of power to the AX1. > Take the same signal strength measurements ... again around the circle in > order to try to take into account any directionality of the wire if it isn't > mostly vertical. > > If the AX1 by itself was doing most of the radiating the 2nd AX1 would be a > better counterpoise than the wire. That's not debatable. > > 73, > Dave AB7E > > >> On 8/27/2019 4:07 PM, Wayne Burdick 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 <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 eric.swa...@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
