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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/RJ5G3ETWFEBGO2HRSHV2KIBSXLESN4AS/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "1492716407.2626951256974524536.JavaMail.root@sz0126a.emeryville.ca.mail.comcast.net",
    "message_id_hash": "RJ5G3ETWFEBGO2HRSHV2KIBSXLESN4AS",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/RJ5G3ETWFEBGO2HRSHV2KIBSXLESN4AS/?format=api",
    "sender": {
        "address": "w7lrd (a) comcast.net",
        "mailman_id": "717aa2a241704c7497e9abd8c983f6b7",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/717aa2a241704c7497e9abd8c983f6b7/emails/?format=api"
    },
    "sender_name": "Bob- W7LRD",
    "subject": "[amsat-bb] Re: Simple 2.4Ghz helix plans?",
    "date": "2009-10-31T07:35:24Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "\n\nhttp://www.csgnetwork.com/antennahtcalc.html \n\nhttp://www.rac.ca/tca/2006-01%20Helix%20Design%20Calculator.html \n\n\n\n\n\nHello Mike \n\nHere are a couple I have used.  Also find attached are a few pictures of past and some present antennas.  I have followed the same process and building methods for L band antennas.  I have used Drake, Transystem, Keps and SSB downconverters.  The helix is pretty forgiving in measurements.  I have the book \"Antennas\" by Kraus and have \"tried\" to follow the math and theory.  Sort of fair in that regard.  I find once I have built few and actually used them, I start to get a feel for them.   Which downconverter do you have?  There are several good articles in past AMSAT journals.  Specifically by Clair-VE3NPC, also K0VTY -Joe, he has forgotten more than I'LL ever know.  I have corresponded with them many times.  I have built many short helix feeds (5 turns) for off center dishes.  In fact that's what I used for AO-40 (sobsob).  So, good luck with your efforts.  If I can give you any hints, suggestions or whatever, just drop me a email. \n\n73 Bob W7LRD \n\nSeattle \n\n\n\n----- Original Message ----- \nFrom: \"Michael Tondee\" <[email protected]> \nTo: \"Amsat BB\" <[email protected]> \nSent: Friday, October 30, 2009 9:03:02 PM GMT -08:00 US/Canada Pacific \nSubject: [amsat-bb]  Simple 2.4Ghz helix plans? \n\nI threw this out there on the eham satellite forum looking for answers \nbut I'll try here too. \nI'm looking for some fairly simple plans for this antenna. Everything I \nfind either seems to be intended for WiFi or if it is ham related is \nfull of mathematical formulas to figure length, diameter, spacing etc. \nMath was never my strong suit so I'd prefer to find something with the \nactual already computed dimensions clearly stated. Preferably in English \nrather than metric measurements. I found an article in the May/June 2008 \nAMSAT Journal that looked promising but there are no hard numbers, just \nthe formulas  and I don't have a calculator capable of some of the   \ncomputations, much less being able to work them out in my head. Been a \nlong time since I was in school!.. hi hi... I have a downconverter I'm \nnot sure even works and I don't want to spend a huge amount of time and \ntrouble to be able to test it. \nTnx and 73, \nMichael, W4HIJ \n_______________________________________________ \nSent via [email protected]. Opinions expressed are those of the author. \nNot an AMSAT-NA member? Join now to support the amateur satellite program! \nSubscription settings: http://amsat.org/mailman/listinfo/amsat-bb \n",
    "attachments": []
}