This was the idea of the Wiki, which seemed to be a victim of infant mortality.
-- Ben Jackson - [email protected] - www.innismir.net Sent from my Mobile Device Andrew Rich wrote: You know this amsat-bb needs to collect up all the info and make a forum web page Same old info over and over ----- Original Message ----- From: "Greg D." <[email protected]> To: <[email protected]>; <[email protected]> Sent: Saturday, October 31, 2009 5:15 PM Subject: [amsat-bb] Re: Simple 2.4Ghz helix plans? > > Hi Michael, > > > > I followed instructions from Howard Long, G6LVB, posted here a few > years ago. (If the archives go back far enough, it was in November of > 2001). I don't have it electronically, but the instructions went > something like this: > > > > Get a long piece of thick bare copper wire (#10 is what I think I used), > and > put a small mark on it every 5 3/4 inches (146mm). Sharpie marker works > well. Wrap it around a > cardboard tube that's about 1 3/4 inches in diameter. The tube from a > roll of paper towels works fine; the dimension is not critical. Space the > turns about 1 1/4 inches (32mm) apart. > > Now, here's the magic part: once you get the helix about right, sight > down one edge, and you'll see those 146mm marks you made in the first > step. Twist and stretch the coils so that they all line up, AND at the > same time, keep the turns spaced (center to center) 32mm apart. Take your > time. The diameter of the turns will take care of itself. > > For the first 1/4 turn (the matching section), decrease the pitch so that > it gently slopes away from the reflector, which needs to be something > around 4 or so inches in diameter. The rest of the mechanical stuff you > can pretty much make up yourself. There are a lot of examples if you > browse around the web a bit. > > Helix antennas are pretty forgiving in construction, and really cheap to > make. > > Greg KO6TH > > p.s. If you already have a Wi-Fi antenna, it should work too. > Conversely, I've found that a Helix easily outperforms those "Pringles > can" Wi-Fi antennas that were popular a few years ago, in a Wi-Fi > application. > > >> Date: Sat, 31 Oct 2009 00:03:02 -0400 >> From: [email protected] >> To: [email protected] >> Subject: [amsat-bb] Simple 2.4Ghz helix plans? >> >> I threw this out there on the eham satellite forum looking for answers >> but I'll try here too. >> I'm looking for some fairly simple plans for this antenna. Everything I >> find either seems to be intended for WiFi or if it is ham related is >> full of mathematical formulas to figure length, diameter, spacing etc. >> Math was never my strong suit so I'd prefer to find something with the >> actual already computed dimensions clearly stated. Preferably in English >> rather than metric measurements. I found an article in the May/June 2008 >> AMSAT Journal that looked promising but there are no hard numbers, just >> the formulas and I don't have a calculator capable of some of the >> computations, much less being able to work them out in my head. Been a >> long time since I was in school!.. hi hi... I have a downconverter I'm >> not sure even works and I don't want to spend a huge amount of time and >> trouble to be able to test it. >> Tnx and 73, >> Michael, W4HIJ >> _______________________________________________ >> Sent via [email protected]. Opinions expressed are those of the author. >> Not an AMSAT-NA member? Join now to support the amateur satellite >> program! >> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb > > _________________________________________________________________ > Windows 7: Simplify your PC. Learn more. > http://www.microsoft.com/Windows/windows-7/default.aspx?ocid=PID24727::T:WLMTAGL:ON:WL:en-US:WWL_WIN_evergreen1:102009 > _______________________________________________ > Sent via [email protected]. Opinions expressed are those of the author. > Not an AMSAT-NA member? Join now to support the amateur satellite program! > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb -------------------------------------------------------------------------------- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.423 / Virus Database: 270.14.39/2470 - Release Date: 10/30/09 15:18:00 _______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb _______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
