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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/QAZHH7Y3S72EAEV57DRNTGFWRYJZJW5E/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "QAZHH7Y3S72EAEV57DRNTGFWRYJZJW5E",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/QAZHH7Y3S72EAEV57DRNTGFWRYJZJW5E/",
    "sender": {
        "address": "kd6pag (a) amsat.org",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "John Mock KD6PAG",
    "subject": "[amsat-bb] Re: QUAGI vs HELIX vs QUAD",
    "date": "2007-12-07T17:34:45Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "In some ways, it depends on which satellites one is talking about for this\ncomparison to be that meaningful in terms of types of antennae.  If i've\nfigured things properly, comparing an RHCP helix against a linearly\npolarized Quagi is likely to get you a 3dB difference if the satellite is\nRHCP.  Even if the satellite is linearly polarized, on an AZ-EL mount,\nRHCP may still be the winner, as my experience on an Arrow- equivalent\nantenna is that linear polarization tends to change from the beginning of\na pass through the end (especially on AO-27).  I figure about half of time\non the average, the linearly polarized antenna is going have mismatched\npolarization.\n\nA better comparison would be a RHCP Helix against an RHCP Quagi.  I have\nmisplaced my copy of the article, but i think the article that inspired\nthe antenna system that i built was based on the QST January 1990 article\n\"Circularly Polarized Quagi Antennas for Space Communications\".  The drive\nloop is fed on two adjacent corners to obtain circular polarization.  I\nmodeled and then built a phased pair of quagi.  The phasing harness had \nlots of coax in it, but the rest was fairly straightforward.\n\n    http://www.qsl.net/kd6pag/nec/q436-5cp1q.html\n\nThe modeled gain was 17dBc, and whether i believe that or not, what i do\nknow is that i was able to work AO-40 QRP near apogee.with that antenna,\nnot long before AO-40 went silent.\n\nI had also built a long helix out of copper tubing, but didn't really test\nit adequately.  It was a bit heavy and rather unwieldy by comparison.\n\n\t\t         -- KD6PAG  (Networking Old-Timer, Satellite QRPer)\n",
    "attachments": []
}