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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/IQ6AUXFAHKK33LH5WIDGTRV5IWJ62BC4/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "548C0CF902824196A29F9824C577F76E@clarePC",
    "message_id_hash": "IQ6AUXFAHKK33LH5WIDGTRV5IWJ62BC4",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/IQ6AUXFAHKK33LH5WIDGTRV5IWJ62BC4/?format=api",
    "sender": {
        "address": "clarefowler (a) rogers.com",
        "mailman_id": "e6ff4277069b46a8b5f3282d1c5b595a",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/e6ff4277069b46a8b5f3282d1c5b595a/emails/?format=api"
    },
    "sender_name": "Clare Fowler",
    "subject": "[amsat-bb]  Re HELIX REFLECTOR?",
    "date": "2010-06-05T05:13:30Z",
    "parent": null,
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/XKLNTPYRTXIYRTRLZ3OIFM225AUWJ6DA/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "\n To add to the discussion the July/Aug 2007 Amsat Journal has an article\ncovering some gain comparisonmeasurements I made between four\n13 turn (2.88 wavelengths) 13cm antennas  with different square solid\naluminum reflectors.\nThe sizes were 0.56 wavelengths, 0.84 wavelengths, 1.0 wavelength and 1.4\n wavelengths.\nThere was no difference between the 0.84, 1.0 and 1.4 wavelengths but the\n antenna with the0.56 wavelength reflector had 1.5 db less gain.\n\n However for my 70cm helix antennas I followed the Satellite Handbook \nminimum\n size of 0.6 wavelengthsor slightly over 16 inches. I used 1/2 inch hardware \ncloth\nmesh to keep the weight and windloading down.\nThese antennas have performed well however it appears that they would be a\n bit better with a somewhat larger reflector.\n\n A brief description and picture of the 70 cm reflector is in the\n November/December 2005 Amsat Journal article on\nThe Development of a Quarter Wave Match for helical antennas.\n\nClare  VE3NPC\n\n>> Hi All:\n>> I am rebuilding a 440 MHZ Helix that I built several years ago . It \n>> worked very well, but I would like to reduce the size of the reflector to \n>> a more manageable size than I had before. The only reference to reflector \n>> size I can find is, \"minimum 20\" \". I may be looking in the wrong places. \n>> I would appreciate it, if someone would steer me in the right direction.\n>> Thanks,\n>> Pete, K1HZU\n\n",
    "attachments": []
}