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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/FPQ3IOK7YULKQEKW67HZNRPRRJI64S2V/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "CAJEM474L3K9AwsMZsRNk3=rTPfC78g2Z7dQ8q_s4cuJytpmjdg@mail.gmail.com",
    "message_id_hash": "FPQ3IOK7YULKQEKW67HZNRPRRJI64S2V",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/FPQ3IOK7YULKQEKW67HZNRPRRJI64S2V/",
    "sender": {
        "address": "samudra.haque (a) gmail.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Samudra Haque",
    "subject": "[amsat-dc] inquiry about homebrew az-el systems",
    "date": "2013-02-23T23:59:35Z",
    "parent": null,
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/5B4SAYG7RQFSRWY26OQFBMLSR5GZUXHP/"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi, about two years ago, I started a design for a robotics class project of\na AZ-EL rotator controller system, and a hardware package for the mechanism\nfor rotating an antenna in any direction subject to mechanical stops. The\nsystem would have been able to handle regular and flip modes. I didn't do\nanything more than calculations, and moved on to building a classroom\ninstructional robot then.\n\nLately, as I am setting up (K3GWU, the George Washington University Amateur\nRadio Club and Research Station) I find that the price of az-el systems\nsuch as G5500 + Yaesu AZ-EL rotors are expensive, and are not typically\navailable on an affordable basis on Ebay or eham.net etc. Well, of course,\nexpensive is a relative term, for a student hobby organization, it's a lot,\nand I guess for small ham operators it is also moderately expensive.\n\nThis may be a frequently asked topic: does any one have experienced with\n(tested) kit designs for AZ-EL rotors that can be made with parts from\n current suppliers ? I know there are a number of controller designs, but I\nam interested to know if there are any options for suppliers of the\nrequired gears/motors etc.\n\nI have located several large AC motors / DC motors at my university\nmechanical engineering workshop, but they are not all guaranteed the same\nspecs. I now realize if I do embark on a actual design process with my\nmodel/simulation/hardware, it would be nice to build several of these all\nat once to share the development cost over the production run, and ensure\nthose who want a cheap AZ-EL system can get one. Otherwise the production\ncost of one heavy duty system is going to be quite high.\n\nI hope some of you may have suggestions for me, both (+) and (-) or perhaps\n(~) in nature. I thought amsat / amateur radio folks have a common need to\nencourage homebrew activity to keep their brain cells in working condition?\n\nI'm opening this question up to the national US audience, and welcome any\ndiscussion on the challenges of making the ever-so-important\nazimuth-elevation rotor. I've studied some of the alternatives: Alliance\nU100 and Yaesu G-5500. I think we can do better in 2013. But ideally, to\nallow the wide adoption of AMSAT ground stations, what price point would\nthe system have to be to make it worth building ?\n\n73 de N3RDX\nGeorge Washington University\n",
    "attachments": []
}