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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/DVPJ7I2M2LASPTVKYL35CRJ4NAHYISK5/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "012d01c92dd3$8d36ad90$fbce517c@yd1eee12",
    "message_id_hash": "DVPJ7I2M2LASPTVKYL35CRJ4NAHYISK5",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/O4M2MWI56YP2VX2KH6TOFXUR2TSBUZK6/",
    "sender": {
        "address": "enggi1401 (a) gmail.com",
        "mailman_id": "ac63f558489841f0bfb7a3bdb2a530c4",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/ac63f558489841f0bfb7a3bdb2a530c4/emails/"
    },
    "sender_name": "Dirgantara YF0EEE",
    "subject": "[amsat-bb] Re: Turnstyle antena",
    "date": "2008-10-14T08:04:40Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/AXDMTNFVVBSCH66EJKOO3P7VY2KW2TKV/",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "hi Gordon\n\nif I use home brew it is possible in space ?, Sun solar hardener it possible\ndamage the antenna\nany solution ?  Factory build ? if possible already tested in hardener and\nfor Space use.\n\nbtw want to use in VHF and UHF\n\nthanks\n\nde YF0EEE\n\n\n----- Original Message ----- \nFrom: \"Gordon JC Pearce MM3YEQ\" <[email protected]>\nTo: \"AMSAT-BB\" <[email protected]>\nSent: Tuesday, October 14, 2008 2:44 PM\nSubject: [amsat-bb] Re: Turnstyle antena\n\n\nDirgantara R - YFØEEE wrote:\n> hi\n>\n> Any body know ?, in where i can buy Turnsytle antena for LEO Sat ? and\n> cheap.\n> I have some project testing Prototype LEO Sat.\n>\n> 73 de YF0EEE\n\nTurnstile antennas are actually pretty easy to make.  At its simplest,\nit's four bits of wire about 1/4 wavelength long, with a 1/4 wavelength\nphasing loop joining them.  Note that the lengths of the elements and\nthe phasing loop are going to be actually 1/4 wavelength multiplied by\nthe velocity factor, which for the elements will be so near unity it's\nnot worth bothering with (make them a tiny bit shorter *if* you need\nto), and for the phasing loop will be dependant on the cable used - 0.66\n  for RG58.\n\nYou haven't said which frequency range you want the antenna for, but on\nUHF I've had excellent results with the K5OE antenna, and I've also had\na lot of success with the \"cheap yagi\" designs by WA5VJB.  The latter I\nfound a bit \"narrow\" to tune, though.\n\nGordon\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\n",
    "attachments": []
}