> On Sep 21, 2022, at 10:12 PM, Dan Presley <n7...@arrl.net> wrote: > > I believe what Wayne meant to say was’now replace the AX1 with a resistor’ > not a wire.
Yes, that's what I meant. An edit went awry -- thanks for catching it. Wayne > Nonetheless the AX1 and 2 still serve a definite purpose in portable > operating that a resistor or light bulb won’t 🤪. And I fail to see what the > problem is with using a counterpoise,even if it’s doing some of the > radiating. Most antenna systems that are unbalanced (verticals,end feds,etc) > require a counterpoise. Are you claiming that a resistor with a counterpoise > is as effective as shortened vertical?? I believe Rudy Severn’s work has > already demonstrated the effectiveness of short verticals with various > counterpoises. > Yesterday I did a SOTA activation where I worked Japan,France and Spain with > 5W and the AX1. Obviously the altitude advantage is great and I used 3 13’ > radials. I also try to position myself near a sloping edge to maximize my > radiation effectiveness (as Tom Schiller N6BT advocates). I doubt a 50 ohm > resistor would achieve this… and just in case someone says ‘it’s only because > the other stations have big antennas etc ‘ some of the contacts were what we > call ‘S2S’ or summit to summit with other activators using similar equipment > and power. Perhaps hiking to a bare summit and figuring out what gear you’d > haul on your back will give you a certain perspective and appreciation. > > > Dan Presley 503-701-3871 > danpresley@me. com > n7...@arrl.net > > >> On Sep 21, 2022, at 20:32, David Gilbert <ab7e...@gmail.com> wrote: >> >> Why would I replace the wire with a resistor? I was talking about replacing >> the AX1 with a resistor and keeping the wire. >> >> I have no doubt that an AX1 without a wire hears better than a resistor >> without a wire, but that's mostly because the resistor provides a better >> match and can't rely on body capacitance or the coax shield. >> >> If the AX1 was less expensive I'd buy one and do the tests. I may be >> totally wrong, but I still say that ANY tuned short whip with a counterpoise >> is doing most of the radiating from the counterpoise. >> >> 73, >> Dave AB7E >> >> >> >> On 9/21/2022 7:59 PM, Wayne Burdick wrote: >>> Dave, >>> >>> I've done many variations on whip antenna tests. >>> >>> A resonant 4' whip with or without a counterpoise is on a different planet >>> from a resistor. If an AX1 were listening in on this conversation, it would >>> challenge you to a duel, with live ammo :) >>> >>> In fact the counterpoise is absolutely required for transmit, but you can >>> get away without it on receive, where body capacitance to ground alone will >>> suffice, even on the HF bands. >>> >>> Try this test: Go outdoors and connect an AX1 (or equivalent) to the >>> antenna jack of any 20 meter receiver. With r without the counterpoise >>> You'll get of noise, lots of signals. >>> >>> Now replace the wire with a resistor. >>> >>> Nothing. >>> >>> QED.... >>> >>> Wayne >>> N6KR >>> >>> >>> >>> >>> >>>> On Sep 21, 2022, at 7:29 PM, David Gilbert <ab7e...@gmail.com> wrote: >>>> Well, the reason I mentioned the 50 ohm resistor is that a year or so ago >>>> somebody on this reflector mentioned that he did a direct comparison >>>> between an AX1 with the recommended 13 foot wire counterpoise and with no >>>> counterpoise at all. I don't remember for certain but I think he said he >>>> used the RBN. I do remember that he said the difference in signal >>>> strength was about 30 db. For grins I used EZNEC to model a single 50 hm >>>> resistor 15 feet off the ground with and without a 13 foot wire hanging >>>> from one end of it. I got 30 db difference in calculated signal strength. >>>> I am by no means claiming that is a definitive or even relevant test ... I >>>> just think it would be interesting to actually do an empirical comparison. >>>> It is my opinion, however, that most of the radiating on an AX1 (or any >>>> other short loaded whip) is being done by the counterpoise wire and/or the >>>> shield of the coax. The coil and whip are matching aids. If so, it's >>>> possible that a resistor would accomplish the same thing. ;) >>>> As I said, I'd be willing to do the comparison if anyone is willing to >>>> lend me an AX1. I'd be happy to be proven wrong. >>>> 73, >>>> Dave AB7E >>>> On 9/21/2022 6:46 PM, j...@kk9a.com wrote: >>>>> Thomas Schiller, N6BT once wrote an article titled "Everything Works". In >>>>> the article he discussed how he worked all continents on CW (a mode that >>>>> you >>>>> can actually hear) using a light bulb antenna during the ARRL DX contest. >>>>> The AX1 appears to be a 45" whip with a base inductor made of 20AWG wire. >>>>> I >>>>> am not sure what is inside the base, if anything, to bring the impedance >>>>> up >>>>> to 50 ohms. With some sunspots, I am sure that it is fun for pedestrian >>>>> mobile use which is what it's designed for. A 1/2wl dipole or 1/4wl >>>>> vertical >>>>> will be a much better radiator. >>>>> John KK9A >>>>> David Gilbert ab7e wrote: >>>>> A comparison to any other antenna would be useful. A comparison to a 50 >>>>> ohm resistor with a similar counterpoise wire would be even more useful >>>>> as a baseline measurement. If anyone wants to lend me their AX1 I will >>>>> do that. >>>>> 73, >>>>> Dave AB7E >>>>> On 9/19/2022 10:33 AM, Ron Gruner wrote: >>>>>> I've been impressed by how well my little AX-1 whip antenna performs on >>>>>> 20 >>>>>> meters. Here's a photo of the rig: >>>>>> https://gruner.com/k4rhg/andover_ma.png >>>>>> and the propagation map: >>>>> https://gruner.com/k4rhg/wspr_2watts_sep16_2022.png >>>>>> A friend, Derek Rowell (AK1WI), gave me a two-watt WSPR kit he had >>>>> designed >>>>>> -- easy and fun to build. I connected the unit to the AX-1 sitting in a >>>>>> window sill facing west and strung the out-of-the-box counterpoise over a >>>>>> lamp shade and bed headboard. No idea what the SWR is, but it must be >>>>>> pretty good. >>>>>> I immediately began receiving propagation reports and within 24 hours had >>>>>> reports from 240 unique stations. The farthest was VK5ARG (17,276 km) >>>>>> with >>>>>> a SNR of -21. Even though the window faced the west, propagation into >>>>>> Europe was strong with SV9KI (7,800 km) reporting -26 SNR. The >>>>>> propagation report is from http://wspr.rocks/ <http://wspr.rocks/> >>>>>> I've found that WSPR is a great way to evaluate antennas. The AX-1 seems >>>>>> to be performing very well. >>>>>> 73, >>>>>> Ron Gruner >>>>>> K4RHG >>>>> ______________________________________________________________ >>>>> 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 ab7e...@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 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 n7...@arrl.net > > ______________________________________________________________ > 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
