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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/JW7YUIYR52KSRJHFXUEDWQ4RQQ5EUIM6/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "JW7YUIYR52KSRJHFXUEDWQ4RQQ5EUIM6",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/P65A2TURZC3YLUHXCZ5QACGFK5QSXUG5/?format=api",
    "sender": {
        "address": "8p6sm (a) anjo.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Gus 8P6SM",
    "subject": "[amsat-bb] Re: maximum AO-7 distance",
    "date": "2012-10-02T01:43:27Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/P65A2TURZC3YLUHXCZ5QACGFK5QSXUG5/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "On 10/01/2012 02:47 AM, Bob- W7LRD wrote:\n> to my AO-7 afictionados...what is the maximum distance one can\n> work edge to edge, and how did you figure that out?\n> 73 Bob W7LRD\n\nMaximum communications distance:\n\n    MCD = 2 R arccos [ R / (R + h) ]\t\n\nwhere\n    R = Radius of earth (Spherical earth: 6371 Km)\n    h = Height at apogee\n\n       (Eq 12.4, Sat. Experimenters Handbook 2nd Ed; Davidoff)\n\t\t\t\nAll you need is the apogee height for the satellite in question, and a \ncalculator.  For AO-7 the apogee height USED to be 1460 Km, and probably \nhasn't altered much over the years.  Therefore:\n\n     MCD = 2 * 6371 * arccos [ 6371 / (6371 + 1460) ]\n         = 12756 * arccos [ 6371 / 7831 ]\n         = 12756 * arccos [ 0.8135614864 ]\n         = 12756 * 0.620545318575\n\t= 7915.7 Km (4918.59 miles)\n\nWhat is the \"official\" distance?\n\nWith a good station, the non-spherical earth working for you at your QTH \nand hoping for some sub-horizon love, who knows?\n\n-- \n73, de Gus 8P6SM\nThe Easternmost Isle\n",
    "attachments": []
}