Email Detail

HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/HMSSAVQBL2ZD6RO2LRLKY2KUK7PGOTQX/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "001301c80432$a9a26fd0$6501a8c0@Dave",
    "message_id_hash": "HMSSAVQBL2ZD6RO2LRLKY2KUK7PGOTQX",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/HMSSAVQBL2ZD6RO2LRLKY2KUK7PGOTQX/?format=api",
    "sender": {
        "address": "doc (a) volcano.net",
        "mailman_id": "8def7ae0024b4494a6f2f9779d12f4f3",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/8def7ae0024b4494a6f2f9779d12f4f3/emails/?format=api"
    },
    "sender_name": "Dave Larsen PhD",
    "subject": "[amsat-bb] Re: Keep It Simple, MM",
    "date": "2007-10-01T13:55:00Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Most of these are do to SEI  [Single event interrupt's]  caused by Iron \nparticles\n\nDave\nN6CO\n>\n\n----- Original Message ----- \nFrom: \"MM\" <[email protected]>\nTo: <[email protected]>\nSent: Monday, October 01, 2007 5:06 AM\nSubject: [amsat-bb] Keep It Simple, MM\n\n\nKeep It Simple Silly KISS\nBy Miles WF1F\n\nThe direction of this tread is caution.  I am not\nsuggesting that we do not use digital technology for\nsatellites, just that we need to be careful of the\ntechnology.  The Space environment is not kind to\ndigital circuits.  Digital circuits are easily\ncorrupted by solar radiation and thermal stresses.  A\ndigital circuit designed for use on Earth many not\nsurvive the rigors of outer space.  This is partially\nbecause of the Size of a transistor inside a modern\nCPU.\n\nIn 1978 a computer transistor was made up of wires 3\nmicrons in size.  Today's CPU Itanium, uses wires 0.18\nmicrons in size.  The new DSP chips used on Digital\nradio will be some where in-between.  With the wire\nsizes in the 0.20-micron range, it's much easier for\nsolar radiation to cause temporary shorts, which can\ncause system crashes.\n\nIn 2004 ago I was visiting NASA Goddard and I was\ntalking to an engineer building a new communications\nsatellite.  I asked him \"What CPU and OS do you use\".\nHe responded, \"We use Intel 80386 and our own\nOperating System\".  He said, the 1.5-micron technology\nof the 80386 is more radiation resistant than the new\nPentium CPU's.\n\nOn the Mir Program, we noticed that simple\nOff-the-Shelf TNC modems seemed to only have a life\nspace of 2-3 years before we began to notice Frequent\nLockups and other strange issues.\nOn ISS, a year after we activated the second PacCom\nTNC, it began to lock up almost weekly during its last\nmonth of operation.\nThe Kenwood TM-D700 on ISS ran ok for three years\nuntil it was discovered there were some anomalies in\nthe software settings.  The radio was taken off Public\naccess for a year until the crew was given time to do\na manual partial reprogram of a few channels.  Neither\nthe cause of the anomalies or the extent has been\ndetermined.\nOne of the ISS crew was allegedly asked once, \"What do\nyou do all day\", he allegedly said, \"Reboot computers\"\nThey have 50 laptops on ISS.\n\n\n\n\nIn closing\nUse caution in your designs.\n\nKeep It simple.  A small satellite that does one or\ntwo features is better than one big satellite that\ndoes 10 big features.\n\nThe more transistors, the more points of failure.\n\nAxle lead Resistor and through-hole mounting of\ncomponents are much more resilient in space than\nsurface mount components.\n\nHardware is not your only problem; you also need to\nExtensively Test the software that runs the satellite\nproject.\n\nYou can never do too much Testing.\n\nThe Analog satellites AO-7 (launched Nov 1974) and\nAO-10 (June 1983) are still there when the sun is\nshining.\n\n73 Miles WF1F\n\nwww.marexmg.org\n\n\n\n      ____________________________________________________________________________________\nCheck out the hottest 2008 models today at Yahoo! Autos.\nhttp://autos.yahoo.com/new_cars.html\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",
    "attachments": []
}