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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/PS4XRZW25KOSZN4W4H2CSJUCLJ2I3WCI/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "8FE542A2AF264134ABEBCAA64182C28B@WA4SCA",
    "message_id_hash": "PS4XRZW25KOSZN4W4H2CSJUCLJ2I3WCI",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/YNABYL5AHULUQDHKTBDQS6GTFFQOQ6IC/?format=api",
    "sender": {
        "address": "APBIDDLE (a) UNITED.NET",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Alan P. Biddle",
    "subject": "[amsat-bb] Re: LF Satellite ideas?",
    "date": "2010-12-12T12:38:06Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/YQCPVIHD2YQ6CLDPH5EVKARCUAHIBP6K/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Running a long conductor at high speeds through even a week magnetic field\nproduces some impressive voltages.  It has been proposed as a way to convert\nkinetic energy to electrical power, and run in reverse to provide a method\nto reboost spacecraft.  Lots of theoretical and experimental studies on that\naspect.\n\nAlan\nWA4SCA\n \n\n-----Original Message-----\nFrom: [email protected] [mailto:[email protected]] On\nBehalf Of Jeff Yanko\nSent: Sunday, December 12, 2010 5:26 AM\nTo: Bob Bruninga ; [email protected]\nSubject: [amsat-bb] Re: LF Satellite ideas?\n\nHi all,\n\nA 1100 meter long antenna attached to a satellite moving through a very thin\n\natmosphere would be interesting.  My concern would be the static build up of\n\nenergy on the antenna leading back to the satellite.  I would think it this \nwould fry any circuitry in the satellite.  If I recall correctly didn't one \nof the shuttle mission have a problem of static build up on along tether and\n\nhad to give up on the experiment?\n\n\n73,\n\nJeff  WB3JFS\n\n\n\n\n\n\n\n----- Original Message ----- \nFrom: \"Bob Bruninga \" <[email protected]>\nTo: <[email protected]>\nSent: Saturday, December 11, 2010 11:13 AM\nSubject: [amsat-bb] LF Satellite ideas?\n\n\n> Is 137 KHz possible from space?\n>\n> Our next Cubesat will have a 1100 meter long antenna (think tether \n> satellite).  It will ultimatelly be an electrodynamic tether but the first\n\n> one will have NO ACTIVE ELECTRONICS connected to the tether.\n>\n> So I have asked them to make it 1100m long instead of a generic 1km tether\n\n> to try to make it resonant in an amateur band.  THe path loss at 137 KHz \n> is 60 dB LESS than it is at 2 meters, so it shouldn't take much to \n> communicate with an 1100m long antenna.\n>\n> I'm sorry I didnt think of this sooner, but I need a real SCIENCE \n> justification for this.  Maybe LF that low will never punch through the \n> ionosphere, or maybe it will be completely absorbed.  Can give good \n> science on this idea?\n>\n> Bob, WB4APR\n>\n> _______________________________________________\n> Sent via [email protected]. Opinions expressed are those of the author.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n> \n\n\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": []
}