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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/Q6A4OB2XG64DFYBRPCDXC4OIZPREJMQM/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "D814A78DE5354BEAB79301CB509E987D@WA4SCA",
    "message_id_hash": "Q6A4OB2XG64DFYBRPCDXC4OIZPREJMQM",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/LCXSRRNEWR72ST2MSIZZR7UGDYMWO5M5/?format=api",
    "sender": {
        "address": "APBIDDLE (a) UNITED.NET",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Alan P. Biddle",
    "subject": "[amsat-bb] Re: satellite durability fm vs. linears",
    "date": "2011-11-29T16:21:13Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/LCXSRRNEWR72ST2MSIZZR7UGDYMWO5M5/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Zach,\n\nGood question.  Part of the answer depends on your definitions of \"working\nproperly,\" and \"quickly.\"\n\nHO-68 and SO-67 have gone away quickly, that is within about a year of\nlaunch.  By comparison, AO-51 was launched in 2004, with many years of\nservice.  AO-7 was dead for a couple of decades before returning to life,\nalbeit with a bit of senility.  FO-29 has periods of outages.  AO-27, an FM\nbird launched almost 20 years ago, remains quirky in scheduling but popular.\nSO-50, 10 years old, also gets much use.  \n\nWhen you look at them all, there isn't much correlation between the type\nsatellite and lifetime.  Issues such as the technology used, and the orbit,\nare much bigger issues.  And as always, Murphy gets the last laugh.\n\n73s,\n\nAlan\nWA4SCA\n\n\n\n\n\n-----Original Message-----\nFrom: [email protected] [mailto:[email protected]] On\nBehalf Of zach hillerson\nSent: Tuesday, November 29, 2011 9:49 AM\nTo: [email protected]\nSubject: [amsat-bb] satellite durability fm vs. linears\n\nSerious question regarding satellite durability.  It seems with HO68, SO67,\nand now AO51, the FM satellites are quickly going away.  It also seems that\nthe older linear counterparts such as AO7, VO52 and FO29 all seem to\ncontinue working properly.  \n\nIs there a design issue with the FM birds that limits the useful lifespan or\nis it purely random luck?  Usage rates, etc... play a role?\n\nIt seems to happen far too often (even with a small sample size) to be a\nfluke.  \n\n\nZach\nN4ERZ\n_______________________________________________\nSent via [email protected]. Opinions expressed are those of the author.\nNot an AMSAT-NA member? Join now to support the amateur satellite program!\nSubscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n\n\n",
    "attachments": []
}