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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/FCYREHL4KZNBPQZGYOT5XGHHI3XZH3WU/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "FCYREHL4KZNBPQZGYOT5XGHHI3XZH3WU",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/FCYREHL4KZNBPQZGYOT5XGHHI3XZH3WU/",
    "sender": {
        "address": "jeffh (a) network-services.uoregon.edu",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Jeff Hite",
    "subject": "[amsat-bb] Re: Quadrifilar Helices",
    "date": "2007-11-02T20:15:34Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "\n> ------------------------------\n> \n> Message: 5\n> Date: Fri, 02 Nov 2007 10:33:09 -0700\n> From: Dave Guimont <[email protected]>\n> Subject: [amsat-bb] Re: Quadrifilar Helices\n> To: \"R.Haighton\" <[email protected]>\n> Cc: [email protected]\n> Message-ID: <[email protected]>\n> Content-Type: text/plain; charset=\"iso-8859-1\"; format=flowed\n> \n> \n>> The Satellite Experimenters Handbook by Martin Davidoff K2UBC (1990 Pages\n>> 8-15 & 16) and it's successor The Radio Amateur's Satellite Handbook (1998\n>> pages 10-13 to 10-15) both have details of this antenna, its use and its\n>> construction.\n>> I recommend this book to all satellite experimenters and users, it may be\n>> nearly 10 years old but the principles and information contained therein\n>> have not changed.\n>>\n>> Robin Haighton VE3FRH\n>> Immediate Past President AMSAT\n>>\n> \n> That's exactly where I started, Robin, on page 6-20 of the original edition.\n> But Maxwell's measurement produced a horrible \n> VSWR.....I saw Marty later on at a convention, \n> and I believe he said the same thing happened to him...\n> \n> It took me 4 iterations to get the antenna flat \n> with no matching device...I of course did it at \n> 435.  But those dimensions translated very \n> successfully to 2M satellite, 2M repeaters, and \n> believe it or not to 2.4 gigs....In front of a dish, of course!!!\n> \n> I had seen other pictures of the antenna, and was \n> very interested prior to Marty's excellent \n> depiction of the construction details...\n> \n> I used a combination of 435 and 2M versions fixed \n> at about 45?, and rotated in AZ only and worked \n> very well with strong signal birds...\n> \n> Quadfilxxxxxxxxx has the dimensions for the 3, \n> but the 2.4 gig computation is left as an exercise for those interested.\n> \n> http://home.san.rr.com/doguimont/uploads/\n> \n> Nice to hear from you, Robin....R U active on any of the birds??\n> \n> \n> \n> \n>             73, Dave [email protected]\n>                     Disagree: I learn....\n> \n>                Pulling for P3E... \n> \n> \n> \n> \n\nI found WB6LLO's 435 version easy to reproduce with good results.\n\n-- \nJeff\nKK7WR\n",
    "attachments": []
}