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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/RB2ZAUMDWCIIUY446DPTWAXVBECLUADL/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "RB2ZAUMDWCIIUY446DPTWAXVBECLUADL",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/FM64JDNIY2WRGBQNOU2S2QHWRPIKEKPK/?format=api",
    "sender": {
        "address": "kq6ea (a) verizon.net",
        "mailman_id": "d2ef86d749ee450c8ad9ffc9f2e15cad",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/d2ef86d749ee450c8ad9ffc9f2e15cad/emails/?format=api"
    },
    "sender_name": "Jim Jerzycke",
    "subject": "Re: [amsat-bb] Circular Antennas",
    "date": "2016-08-12T21:43:41Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/FM64JDNIY2WRGBQNOU2S2QHWRPIKEKPK/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi, Jerry\n\n\nI'm guessing here that you mean the \"bed spring on a stick\" kind of \nnormal-mode helix antenna that you point at the bird, rather than some \nother *omnidirectional* helical antenna like a Quadrifilar Helix \nAntenna, aka \"QHA\"\n\n\nWell, I'm not really sure if they were ever \"in fashion\". They're pretty \neasy to build, pretty broadbanded, and are quite forgiving of minor \nerrors in construction, but seeing as they have no way to switch \npolarization, which can be pretty handy at times, they're pretty limited.\n\n\nI've built a couple, one for 1.2GHz, and another for 70cm, and they work \nquite well for being so simple.\n\n\nOne for 2 Meters is quite a bit bigger, and they start to get cumbersome \nto rotate.\n\n\nOther than the two I built, I've never seen an Amateur Radio version \"in \nthe wild\", although I have seen numerous ones for commercial and \nmilitary use.\n\n\n73, Jim  KQ6EA\n\n\nOn 08/12/2016 06:40 PM, Gerald Payton wrote:\n> Trying to get back into satellite radio from the early 2000s, I wonder what happened to circular helical antennas.  Are they out of fashion now?\n>\n>\n> 73,\n>\n> Jerry  AB5R\n>\n> EM12kh\n> _______________________________________________\n> Sent via [email protected]. AMSAT-NA makes this open forum available\n> to all interested persons worldwide without requiring membership. Opinions expressed\n> are solely those of the author, and do not reflect the official views of AMSAT-NA.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb\n>\n\n",
    "attachments": []
}