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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/OMK4JWDVQDQFLQDVYFE34ITYNEQKIAMI/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "OMK4JWDVQDQFLQDVYFE34ITYNEQKIAMI",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/UV2Y5NQUNTLIJ2VYCVIPMOTE5FI4BVD5/?format=api",
    "sender": {
        "address": "Mat_62 (a) charter.net",
        "mailman_id": "171b40085c2e4ecebefde213375137db",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/171b40085c2e4ecebefde213375137db/emails/?format=api"
    },
    "sender_name": "Michael",
    "subject": "[amsat-bb] Re: inquiry about homebrew az-el systems",
    "date": "2013-02-28T23:02:01Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/HNOSAT73TQZMIJUWOUED2AHS7H6O46BZ/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/EY3UVSXMLYANNFLATQMHHP6SPFRUY4EJ/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "This is what I was getting at when I made my earlier post about about \nthe old Gemini OR-360 TV rotators.  The gear train is driven by a \"540\" \nsized  DC motor. I can tell you from experience that one of these rotors \nwill rotate a mini sized beam on HF.  I do it everyday. So if we are \ndriving a smaller array, we might be able to eliminate some or all of \nthe gearing involved and go with one of the smaller motors. I can't \nrecall the issue but it seems to me I saw an article in QST where \nsomeone was driving a small little beam on top of a tripod with a small \nlittle motor.  I still think a position pot is a better option for \npointing over a stepper motor though.\nMichael, W4HIJ\nOn 2/27/2013 8:30 PM, Gus wrote:\n> Returning to this topic...\n>\n> I'm thinking about a rotator that can handle a small system like the \n> Arrow, or the Cushcraft A270-6s or even the A270-10s.  NOT big boomers \n> like the KLM 22/40 el CP yagis!\n>\n> So we're looking at 1½ - 2 sq. ft of windloading, and maybe 10 lbs of \n> weight.  (Including some sort of crossboom, clamps, coax and \n> counterweights.  Rear mounted antennas like the Arrow will need a \n> rear-mounted counterweight.)\n>\n> Anybody qualified to say what that adds up to in terms of TORQUE \n> required from the motors?  With a little extra thrown in for a safety \n> margin, maybe?\n>\n> I think a simple, low-cost, easily reproducible design is probably \n> doable, if we combine our ingenuity and expertise.\n>\n> -- 73, de Gus 8P6SM\n> Barbados, the easternmost isle.\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 \n> program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n\n",
    "attachments": []
}