The archives for 73 Magazine are online, so if you remember when, folks could read the article.
https://archive.org/details/73-magazine <https://archive.org/details/73-magazine> wunder K6WRU Walter Underwood CM87wj http://observer.wunderwood.org/ (my blog) > On Apr 8, 2016, at 8:05 PM, Doug Person via Elecraft > <[email protected]> wrote: > > I wrote an article for 73 many years ago where I effectively remade the > Isotron antenna with parts from Home Depot. At the time, a 20 meter version > could be built for about $15. I tested my version extensively and for the > most part a dipole made with two Hamsticks was quite superior. > > They resonate, have good SWR bandwidth and generally radiate 5 watts of the > 100 watts that goes into them. A "magnetic loop" blows it away. I sold the > sample Isotron I bought at a hamfest for $5. (Bottom line - they are, as we > say in the software business, crapware) > > Doug -- K0DXV > > On 4/7/2016 5:12 PM, Jim Brown wrote: >> This so-called "antenna" is at best dumb, and at worst a rip-off. As master >> antenna-designer N6BT wrote some years ago, "everything 'works,' even a >> light bulb." He demonstrated this by mounting a a light bulb on a wooden >> fencepost, feeding with coax that he had carefully choked so that the coax >> could not radiate, and working all continents with it. >> >> As others have noted, antennas like magnetic loops, loaded whips (HamSticks, >> etc.), and long wires are the weapons of choice with limited space and/or >> requirements of minimal visibility. If the frame of the building is >> non-metallic, indoor antennas can work (but can also be mondo noisy on RX). >> If the frame is metallic, the antenna must be outside. The good news is that >> the building frame will work fine as a counterpoise (although it may block >> the antenna in the direction of the building). A long wire launched away >> from the building is best -- small diameter enameled wire can be hard to >> see, and works fine as an antenna. >> >> 73, Jim K9YC >> >> On Thu,4/7/2016 2:41 AM, Petr, OK1RP/M0SIS wrote: >>> I am sure that David talked about an Isotron antennas like this: >>> https://www.isotronantennas.com/ >>> >>> I intensively tested/used this antenna in 90's on 40m (product from Sigi, >>> DK9FN) and I have to say it is a nightmare in overall. From my own >>> experiences the performance of this toy was highly dependent to the >>> grounding availability, bandwidth was very small and tunning was influenced >>> by ground only but also by closed objects a lot. >> >> ______________________________________________________________ >> 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] ______________________________________________________________ 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]
