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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/KZBDOIKBK7JNJVCJQTDNAE266XY66G7J/?format=api",
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    "message_id": "CALVMnS_Jb0DUgsWp+GonvExWWh7gsLjHzVT8t4UfFbe0CQ-i-w@mail.gmail.com",
    "message_id_hash": "KZBDOIKBK7JNJVCJQTDNAE266XY66G7J",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/GLY3EKXFUKEJS6JHLX65VJ624JGTU6YT/?format=api",
    "sender": {
        "address": "jonny290 (a) gmail.com",
        "mailman_id": "bed0432ae6e64c0493fa6343553c3746",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/bed0432ae6e64c0493fa6343553c3746/emails/?format=api"
    },
    "sender_name": "Jonny 290",
    "subject": "[amsat-bb] Re: Inverted-V turnstile idea",
    "date": "2014-02-28T21:45:35Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/YNY76ZAMLVXRGADA5LFQEDQWFCLSC5J7/?format=api",
    "children": [],
    "votes": {
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    "content": "Yes, that's exactly what I had in mind! So it very well may be a viable\ndesign, then.\n\n--\nMatt\n\n-jonny 290\n\n\nOn Fri, Feb 28, 2014 at 2:51 PM, Matthias Bopp <[email protected]> wrote:\n\n> Hi Matt,\n>\n> are you referring to a turnstile antenna like the one available from WIMO\n> here in Germany ?\n>\n> Please see the following link: http://www.wimo.de/download/ta1.pdf\n>\n> Best regards\n>\n> Matthias\n>\n> www.dd1us.de\n>\n>\n> -----Ursprüngliche Nachricht-----\n> Von: [email protected] [mailto:[email protected]] Im\n> Auftrag von Jonny 290\n> Gesendet: Freitag, 28. Februar 2014 20:50\n> An: [email protected]\n> Betreff: [amsat-bb] Inverted-V turnstile idea\n>\n> I had an idea pop in my head for a simple turnstile antenna, and am not\n> finding much info on what I want to do via Google searches I wanted to\n> bounce this off the list and see what people think.\n>\n> My idea consists of three main points:\n>\n> -Antenna elements being conventional (non-folded) inverted V dipoles,\n> tuning\n> the 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\n> match using a 1/4 wave paralleled 2x75 ohm line section (37 ohms),\n> transforming the 25 ohms back up to right around 50 ohms for final feed\n>\n> This approach would give the following advantages:\n>\n> -Lower SWR than standard 75-ohm parallel turnstiles -Dipoles could be\n> individually tuned via direct 50 ohm feed during construction -DK7ZB match\n> is constructed out of inexpensive 75-ohm coax -Phasing line length would\n> only affect phase, instead of phase and impedance.\n>\n> My main question, though is: With dipole elements canted down roughly 35\n> degrees from vertical (what I'm ballparking to get them down to 50 ohms),\n> am\n> I going to see noticeably degraded performance, especially regarding the\n> polarization?\n>\n> Thanks for any tips or discussion!\n>\n> --Matt\n> KC4YLV\n> _______________________________________________\n> Sent via [email protected]. Opinions expressed are those of the author.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n>\n>\n",
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}