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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/JJCEIQMLLF3YLEOETODKTCKCJLMRV6LU/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "JJCEIQMLLF3YLEOETODKTCKCJLMRV6LU",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/O4XILNBFF3USSBUPQ6L2ILUEYMST2CA3/?format=api",
    "sender": {
        "address": "ve9qrp (a) gmail.com",
        "mailman_id": "4d6061838db34aba9a1c4722addebfaf",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/4d6061838db34aba9a1c4722addebfaf/emails/?format=api"
    },
    "sender_name": "Bruce Robertson",
    "subject": "[amsat-bb] Re: YouTube on satellite power management",
    "date": "2009-11-05T16:41:03Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/O4XILNBFF3USSBUPQ6L2ILUEYMST2CA3/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "On Thu, Nov 5, 2009 at 8:40 AM, Alan P. Biddle <[email protected]> wrote:\n> There is a very interesting video on management of a satellite so as not to\n> waste energy transmitting \"to whales and penguins.\"  Not new, but a good\n> discussion of the concept and implementation.\n>\n> http://www.southgatearc.org/news/november2009/satellite_power_saving.htm\n>\n>\n> Alan\n> WA4SCA\n>\n\nThanks, Alan --\n\nI'd like to include notes on previous implementations of this idea in\nthe website, but as a hobbyist, I wasn't able to find info on this.\nI'd appreciate any institutional memory folks can offer.\n\nAlso, not mentioned in the video is just how easy it is for people to\nplay with these ideas on their own.\n\nThe underlying Plan13 library, as well as the one that stores\nkeplerian elements in EEPROM, are featured in this video\nhttp://sites.google.com/site/qrptracker/ , at 1:33, we see the\nmicro-controller run a demo, which is a Predict look-alike.\n\nAll the code is open source, published at\nhttp://code.google.com/p/qrptracker/ This is a SVN server, and I'd be\nhappy to welcome people who'd like write access.\n\nOn the hardware side, an Arduino that will run this code (and leave\nhalf of its programming space for further ideas) is available for $20\n- $30!\n\nYou can't go wrong with this model\nhttp://www.sparkfun.com/commerce/product_info.php?products_id=666\nbut if you think eventually you'd like to go to a breadboard set-up or\na mini model (which fits nicely in an altoids box so you can hack on\nthis during your commute :-), I recommend that the USB bridge be\nimplemented off-board. Just be sure to get an arduino with an\nATMega328 processor. The ATMega168's 16k of program space just isn't\nenough to store Plan 13 and do anything with it; whereas, the 328\nleaves lots of space, even for a small operating system\nhttp://robotgroup.com.ar/noticias/20091102/duinos-sistema-operativo-multitarea-para-arduino\n\nNone of this is meant to be an argument in an Atmel vs. Microchip\ndebate, since other considerations come into play in the final\nhardware choice for inflight micro-controllers. But with C++ libraries\nand (pretty well) C code, experiments in this context will be pretty\nportable.\n\nHave fun & 73,\n\nBruce\nhttp://ve9qrp.blogspot.com/\n\n",
    "attachments": []
}