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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/MKKTFNOPU6W46MTXMIEV2JPQDA4NLUQX/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "MKKTFNOPU6W46MTXMIEV2JPQDA4NLUQX",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/KTWUXOBYOY5UR57E5DZLPCER4V7BWW2D/?format=api",
    "sender": {
        "address": "gary_mayfield (a) hotmail.com",
        "mailman_id": "fe442cdc520e4857a9168b9182091295",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/fe442cdc520e4857a9168b9182091295/emails/?format=api"
    },
    "sender_name": "Gary \"Joe\" Mayfield",
    "subject": "[amsat-bb] Re: The Moon is our Future",
    "date": "2009-07-04T03:20:06Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/7XDC32SJP3PGCSQHMUVZE2Z3V4EV653A/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "The thermal cycling would make a gas \"Bag\" antenna interesting as the gas\nexpands and contracts with temperature changes.\n\nI like Bob's idea of an array of collinears lying on the moon's surface,\nsince \"ground\" on the moon must be quite deep due to the lack of moisture.  \n\nThis makes 2 meters very attractive as a down-link.  We could take advantage\nof the reduced path loss and higher efficiencies in the circuits that 2\nmeters (or ten meters) has to offer.\n\nI suspect it would be possible to build such antenna that uses a \"wound up\"\nspring to unwind the antennas for deployment, like a reverse tape measure\nthat uncoils instead of coils up.\n\n73,\nJoe kk0sd\n-----Original Message-----\nFrom: [email protected] [mailto:[email protected]] On\nBehalf Of Gordon JC Pearce\nSent: Friday, July 03, 2009 11:41 AM\nTo: [email protected]\nSubject: [amsat-bb] Re: The Moon is our Future\n\nOn Thu, 2009-07-02 at 18:21 -0500, Gregg Wonderly wrote:\n> It seems to me that the correct choice is the highest frequency we can get\non \n> board for at least 24dB at the longest length of antenna that we would be \n> allowed to send up.\n\nLunar gravity is weaker and there is no wind.  So, a collapsible antenna\nthat wouldn't last five minutes in typical Earth weather will be a lot\nmore usable on the Moon.\n\nMaybe something like a telescopic boom with a gas canister or pyro\ncharge to pop the sections out?\n\nGordon\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",
    "attachments": []
}