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Hexbeam Antenna Modeling
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Hexbeam Antenna Modeling
On Jun 4, 1:09*pm, "J.B. Wood" wrote:
Hello, Steve, and all. *Steve, I see you also have an informative article that is posted online atwww.antennex.com/preview/Dec507/hexbeam.pdf Yes, that article described the process by which I arrived at the broadband version. Since then there have been a couple of write-ups in the monthly Antenna column of RadioCommunication magazine, and RSGB published the design in their recent book "Building successful HF antennas". You may also have seen Leo's (K4KIO) constructional article in the March edition of QST. All that has generated quite a lot of interest in the antenna. I try to avoid exagerated claims for the design - at the end of the day it's a "compressed" Yagi and performs as such. But it does provide useful directivity over the five bands 20m thru 10m, with a single feedline, in a size which suits those of us that don't have a lot of space. It's also pretty easy to construct from readily-available materials, although a number of folk now supply complete kits, including K4KIO and more recently DX Engineering. 73, Steve G3TXQ |
Hexbeam Antenna Modeling
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Hexbeam Antenna Modeling
"J.B. Wood" wrote : Thanks for the reply, Steve. As for exaggerated claims, I'd have to give the award to the designers of (and explainers of the "theory" behind) the Crossed-Field Antenna (CFA). (Of course the CFA has been the subject of numerous antenneX articles but I'm not placing yours in that group!) 73s, I guess that you haven't seen info provided by Art on his shoe-box sized 160M thru whatever antenna that has +9 db gain, and a pencil-thin beam of radiated particles. Art's technical expertise beats the crap out of the CFA guys, as HE (Art) improves on Maxwell's and Gauss' equations, too. And all of this from a retired mechanical engineer, working in his backyard! Mike W5CHR Memphis |
Hexbeam Antenna Modeling
J.B. Wood wrote:
Thanks for the reply, Steve. As for exaggerated claims, I'd have to give the award to the designers of (and explainers of the "theory" behind) the Crossed-Field Antenna (CFA). (Of course the CFA has been the subject of numerous antenneX articles but I'm not placing yours in that group!) 73s, Here's my candidate for the award, embodied in a U.S. patent: http://tinyurl.com/h546u Roy Lewallen, W7EL |
Hexbeam Antenna Modeling
Roy Lewallen wrote:
J.B. Wood wrote: Thanks for the reply, Steve. As for exaggerated claims, I'd have to give the award to the designers of (and explainers of the "theory" behind) the Crossed-Field Antenna (CFA). (Of course the CFA has been the subject of numerous antenneX articles but I'm not placing yours in that group!) 73s, Here's my candidate for the award, embodied in a U.S. patent: http://tinyurl.com/h546u Roy Lewallen, W7EL This particular antenna has the useful property of enhancing plant growth too.. " It has been observed by the inventor and witnesses that accelerated plant growth can occur using the present invention. " I think David Strom knew what we was writing about. He deserves a beer. |
Hexbeam Antenna Modeling
Jeff Liebermann wrote:
On Thu, 04 Jun 2009 19:30:29 -0700, Roy Lewallen wrote: Here's my candidate for the award, embodied in a U.S. patent: http://tinyurl.com/h546u Roy Lewallen, W7EL The link first returned: crt0: ERROR couldn't open /usr/lib/dld.sl errno:000000023 Error #1010 Error: Filter Process terminated abnormally. Document may be truncated. A few minutes later, it was: Error #1006 Error! BRS was unable to process your request. A diagnostic message was mailed to the appropriate personnel. I hate days like this.... Eventually the patent appeared, but no illustrations on that page. Instead, see: http://www.google.com/patents/about?id=csYDAAAAEBAJ&dq=6,025,810 for the schematics, illustrations and a parts list. Hmmm.... only works above 1000F temperature. Googling a bit deeper, I find that the patent holder, David L. Strom, is currently a real estate agent in Colorado. http://www.homethinking.com/180340-David-L-Strom-Coldwell-Banker-Strom--Associates-Inc.html patent # 6025810 if you use the http://www.uspto.gov/ site.. Some day, we'll all be talking about the famous '810 Strom patent, just like folks in the semiconductor industry talk about the '275 Kilby patent Here's my favorite: http://www.google.com/patents/about?id=N_sEAAAAEBAJ&dq=5,982,276 Not exactly an antenna. It uses a MASER to (somehow) magnetically couple Gigabit data to the power lines. The company is still around: http://www.mediafusionllc.net And reforming: "The Media Fusion Team is now re-forming. Mr. William "Luke" Stewart will act a temporary President and Chief Executive as well as Chief Scientist. As other key resources are identified and recruited they will become part of the Media Fusion, LLC Team. A recruiting committee has been formed and recommendations are now being considered." perhaps because of 15 dec 2006.. Preliminary settlement agreement signed by the honorable Judge Ann Ashby, presiding Judge, 134th District Court, Dallas, Texas. |
Hexbeam Antenna Modeling
On Mon, 08 Jun 2009 11:11:44 -0700, Jim Lux
wrote: Here's my favorite: http://www.google.com/patents/about?id=N_sEAAAAEBAJ&dq=5,982,276 Not exactly an antenna. It uses a MASER to (somehow) magnetically couple Gigabit data to the power lines. The company is still around: http://www.mediafusionllc.net And reforming: "The Media Fusion Team is now re-forming. Mr. William "Luke" Stewart will act a temporary President and Chief Executive as well as Chief Scientist. As other key resources are identified and recruited they will become part of the Media Fusion, LLC Team. A recruiting committee has been formed and recommendations are now being considered." perhaps because of 15 dec 2006.. Preliminary settlement agreement signed by the honorable Judge Ann Ashby, presiding Judge, 134th District Court, Dallas, Texas. The old web sites are rather interesting: http://web.archive.org/web/*/http://www.mediafusionllc.net My favorite is the photos of the interface controller built into a wall outlet box: http://web.archive.org/web/20000229124801/www.mediafusionllc.net/northamerica/main/tech/interface.html I showed it to a friend in the power industry who had some interesting things to say about sharing a power outlet box with phone and cable. However, the 14 flashing lights are kinda cool. The problem with such patents is that if someone actually invents a decent way to couple, distribute, and switch gigabit data on the power lines, they'll end up in court fighting this patent. This is also known as a "blocking patent". It's sometimes fun to see where they spend their money. In 1999, they burned $120K on lobbying. In 2000, they only wasted $70K. https://www.opensecrets.org/lobby/clientsum.php?lname=Media+Fusion+LLC&id=Y000003383 20&year=1999 Also, I dunno about the FTL (faster than light) antenna design. That implies that the acknowledgements will arrive before the transmissions, which will surely confuse a T/R switch. Perhaps a predictive T/R switch will help (one that switches before one intends to switch it). -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
Hexbeam Antenna Modeling
Jeff Liebermann wrote:
. . . Also, I dunno about the FTL (faster than light) antenna design. That implies that the acknowledgements will arrive before the transmissions, which will surely confuse a T/R switch. Perhaps a predictive T/R switch will help (one that switches before one intends to switch it). The cool thing is that you'll get the QSL card before you have the QSO. If no QSL comes, don't bother with the QSO. Roy Lewallen, W7EL |
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