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GET /hyperkitty/api/list/[email protected]/email/Y4QJQEW7L2DMPS4GT2ADMMLZWS2UNKZ6/
{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/Y4QJQEW7L2DMPS4GT2ADMMLZWS2UNKZ6/", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/", "message_id": "[email protected]", "message_id_hash": "Y4QJQEW7L2DMPS4GT2ADMMLZWS2UNKZ6", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/75B45OEHEMZRIDMEFI5QIKOW5MF6UU3T/", "sender": { "address": "bbj (a) innismir.net", "mailman_id": "0a00322121654998b9a943e3aa653538", "emails": "https://mailman.amsat.org/hyperkitty/api/sender/0a00322121654998b9a943e3aa653538/emails/" }, "sender_name": "Ben Jackson", "subject": "[amsat-bb] Re: Simple 2.4Ghz helix plans?", "date": "2009-10-31T14:46:05Z", "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/I4PIGQORJFEXJXFW54JXGN4P5K4J2NVW/", "children": [], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "This was the idea of the Wiki, which seemed to be a victim of infant mortality. \n\n--\nBen Jackson - [email protected] - www.innismir.net\nSent from my Mobile Device\nAndrew Rich wrote:\n\nYou know this amsat-bb needs to collect up all the info and make a forum web \n\npage\n\n\n\nSame old info over and over\n\n\n\n\n\n----- Original Message ----- \n\nFrom: \"Greg D.\" <[email protected]>\n\nTo: <[email protected]>; <[email protected]>\n\nSent: Saturday, October 31, 2009 5:15 PM\n\nSubject: [amsat-bb] Re: Simple 2.4Ghz helix plans?\n\n\n\n\n\n>\n\n> Hi Michael,\n\n>\n\n>\n\n>\n\n> I followed instructions from Howard Long, G6LVB, posted here a few\n\n> years ago. (If the archives go back far enough, it was in November of\n\n> 2001). I don't have it electronically, but the instructions went\n\n> something like this:\n\n>\n\n>\n\n>\n\n> Get a long piece of thick bare copper wire (#10 is what I think I used), \n\n> and\n\n> put a small mark on it every 5 3/4 inches (146mm). Sharpie marker works \n\n> well. Wrap it around a\n\n> cardboard tube that's about 1 3/4 inches in diameter. The tube from a \n\n> roll of paper towels works fine; the dimension is not critical. Space the \n\n> turns about 1 1/4 inches (32mm) apart.\n\n>\n\n> Now, here's the magic part: once you get the helix about right, sight \n\n> down one edge, and you'll see those 146mm marks you made in the first \n\n> step. Twist and stretch the coils so that they all line up, AND at the \n\n> same time, keep the turns spaced (center to center) 32mm apart. Take your \n\n> time. The diameter of the turns will take care of itself.\n\n>\n\n> For the first 1/4 turn (the matching section), decrease the pitch so that \n\n> it gently slopes away from the reflector, which needs to be something \n\n> around 4 or so inches in diameter. The rest of the mechanical stuff you \n\n> can pretty much make up yourself. There are a lot of examples if you \n\n> browse around the web a bit.\n\n>\n\n> Helix antennas are pretty forgiving in construction, and really cheap to \n\n> make.\n\n>\n\n> Greg KO6TH\n\n>\n\n> p.s. If you already have a Wi-Fi antenna, it should work too. \n\n> Conversely, I've found that a Helix easily outperforms those \"Pringles \n\n> can\" Wi-Fi antennas that were popular a few years ago, in a Wi-Fi \n\n> application.\n\n>\n\n>\n\n>> Date: Sat, 31 Oct 2009 00:03:02 -0400\n\n>> From: [email protected]\n\n>> To: [email protected]\n\n>> Subject: [amsat-bb] Simple 2.4Ghz helix plans?\n\n>>\n\n>> I threw this out there on the eham satellite forum looking for answers\n\n>> but I'll try here too.\n\n>> I'm looking for some fairly simple plans for this antenna. Everything I\n\n>> find either seems to be intended for WiFi or if it is ham related is\n\n>> full of mathematical formulas to figure length, diameter, spacing etc.\n\n>> Math was never my strong suit so I'd prefer to find something with the\n\n>> actual already computed dimensions clearly stated. Preferably in English\n\n>> rather than metric measurements. I found an article in the May/June 2008\n\n>> AMSAT Journal that looked promising but there are no hard numbers, just\n\n>> the formulas and I don't have a calculator capable of some of the\n\n>> computations, much less being able to work them out in my head. Been a\n\n>> long time since I was in school!.. hi hi... I have a downconverter I'm\n\n>> not sure even works and I don't want to spend a huge amount of time and\n\n>> trouble to be able to test it.\n\n>> Tnx and 73,\n\n>> Michael, W4HIJ\n\n>> _______________________________________________\n\n>> Sent via [email protected]. Opinions expressed are those of the author.\n\n>> Not an AMSAT-NA member? Join now to support the amateur satellite \n\n>> program!\n\n>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n\n>\n\n> _________________________________________________________________\n\n> Windows 7: Simplify your PC. Learn more.\n\n> http://www.microsoft.com/Windows/windows-7/default.aspx?ocid=PID24727::T:WLMTAGL:ON:WL:en-US:WWL_WIN_evergreen1:102009\n\n> _______________________________________________\n\n> Sent via [email protected]. Opinions expressed are those of the author.\n\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n\n\n\n\n\n--------------------------------------------------------------------------------\n\n\n\n\n\n\n\nNo virus found in this incoming message.\n\nChecked by AVG - www.avg.com\n\nVersion: 8.5.423 / Virus Database: 270.14.39/2470 - Release Date: 10/30/09 \n\n15:18:00\n\n\n\n_______________________________________________\n\nSent via [email protected]. Opinions expressed are those of the author.\n\nNot an AMSAT-NA member? Join now to support the amateur satellite program!\n\nSubscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n\n\n", "attachments": [] }