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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/SSQOG357DG7YROB6KM7DOFAWBFFNEEZU/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "SSQOG357DG7YROB6KM7DOFAWBFFNEEZU",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/JF4ADDH6IVBDH6JS5FVGKS2PY7GAEFG3/?format=api",
    "sender": {
        "address": "mlengruesser (a) amsat-dl.org",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Michael R. Lengruesser",
    "subject": "[amsat-bb] Re: 150 cubesats to provide global WIFI multicasting",
    "date": "2014-02-12T16:06:33Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/XHQW2HYSUJRJOB4TVS5HOEMR62FO22AM/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/VNAF4CDUHRDOVQIYO7GV2SWCK3QHCP5E/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "HelloFabio,\nfromexperiencewithFITSAT-1,thelaunchtook placefromtheISS( orbit ~ 400km).\nThelifetime willbeupapprox.9months.\nBut, thisisinfluencedbytheshapeandsizeof thesatellite.\n\n73´s de\nMichael, DD5ER\n\n\n-- \nAMSAT-DL e.V. \n-- International Satellites for \nCommunication, Science and Education --\[email protected]              \nhttp://www.amsat-dl.org\n\n\n\n\n\nAm 12.02.2014 15:45, schrieb Fabio Azzarello:\n> Hello everybody,\n> I agree with Trevor, GS requirement for the 2.4 GHz band are quite\n> \"challenging\".\n>\n> Anyway, I have another question, what kind of orbit this constellation will\n> be designed for?\n> If it is less than 500 km, how many *months* will it last?\n>\n> 73s\n> Fabio\n> iz5xrc\n>\n>\n> On Mon, Feb 10, 2014 at 8:43 PM, M5AKA <[email protected]> wrote:\n>\n>> Yes, a dish needed, ISS HamTV provides a good illustration of the\n>> requirements to achieve a 2 Mbps downlink at 2400 MHz.\n>>\n>>\n>> 73 Trevor M5AKA\n>>\n>>\n>>\n>>\n>> On Monday, 10 February 2014, 18:16, Howie DeFelice <[email protected]>\n>> wrote:\n>>\n>> Just in case anyone was curious about the practicality of actually\n>> transmitting WiFi from a cubesat, I did a quick link budget. Based on\n>> typical 802.11 specs, the MDS of a receiver is about -90 dBm. The path loss\n>> at 2.4GHz between a ground station and a satellite overhead in a 600Km\n>> orbit is a little over 155 dB. Assuming a zero gain antenna on the typical\n>> WiFi client radio, the required EIRP from the cubesat is in the\n>> neighborhood of 4KW.  I don't think we are quite there yet with current\n>> solar cell technology.... not to mention the difficulty keeping the PA cool\n>> :)\n>>\n>> - Howie AB2S\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>> 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> 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",
    "attachments": []
}