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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/YNY76ZAMLVXRGADA5LFQEDQWFCLSC5J7/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "YNY76ZAMLVXRGADA5LFQEDQWFCLSC5J7",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/GLY3EKXFUKEJS6JHLX65VJ624JGTU6YT/?format=api",
    "sender": {
        "address": "matthias.bopp (a) gmx.de",
        "mailman_id": "8e98db3953494c5f92cac72f4aa25f2c",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/8e98db3953494c5f92cac72f4aa25f2c/emails/?format=api"
    },
    "sender_name": "Matthias Bopp",
    "subject": "[amsat-bb] Re: Inverted-V turnstile idea",
    "date": "2014-02-28T20:51:33Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/GLY3EKXFUKEJS6JHLX65VJ624JGTU6YT/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/WE3MS3AYOMVFSCJX5UN3HNRZD6HCOQ2Z/?format=api",
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/KZBDOIKBK7JNJVCJQTDNAE266XY66G7J/?format=api"
    ],
    "votes": {
        "likes": 0,
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        "status": "neutral"
    },
    "content": "Hi Matt,\n\nare you referring to a turnstile antenna like the one available from WIMO\nhere in Germany ?\n\nPlease see the following link: http://www.wimo.de/download/ta1.pdf\n\nBest regards\n\nMatthias\n\nwww.dd1us.de\n\n\n-----Ursprüngliche Nachricht-----\nVon: [email protected] [mailto:[email protected]] Im\nAuftrag von Jonny 290\nGesendet: Freitag, 28. Februar 2014 20:50\nAn: [email protected]\nBetreff: [amsat-bb] Inverted-V turnstile idea\n\nI had an idea pop in my head for a simple turnstile antenna, and am not\nfinding much info on what I want to do via Google searches I wanted to\nbounce this off the list and see what people think.\n\nMy idea consists of three main points:\n\n-Antenna elements being conventional (non-folded) inverted V dipoles, tuning\nthe length for resonance and angle to set at 50 ohms each\n-1/4 wave 50 ohm phasing line between the sets of dipoles -Feed via DK7ZB\nmatch using a 1/4 wave paralleled 2x75 ohm line section (37 ohms),\ntransforming the 25 ohms back up to right around 50 ohms for final feed\n\nThis approach would give the following advantages:\n\n-Lower SWR than standard 75-ohm parallel turnstiles -Dipoles could be\nindividually tuned via direct 50 ohm feed during construction -DK7ZB match\nis constructed out of inexpensive 75-ohm coax -Phasing line length would\nonly affect phase, instead of phase and impedance.\n\nMy main question, though is: With dipole elements canted down roughly 35\ndegrees from vertical (what I'm ballparking to get them down to 50 ohms), am\nI going to see noticeably degraded performance, especially regarding the\npolarization?\n\nThanks for any tips or discussion!\n\n--Matt\nKC4YLV\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\n",
    "attachments": []
}