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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/77NW7GLJ56QMZA5KYX7TVXRWDZ6EDLMB/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "77NW7GLJ56QMZA5KYX7TVXRWDZ6EDLMB",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/77NW7GLJ56QMZA5KYX7TVXRWDZ6EDLMB/",
    "sender": {
        "address": "w5ggw (a) cox.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Gregg Wonderly",
    "subject": "[amsat-bb] Re: 150 cubesats to provide global WIFI multicasting",
    "date": "2014-02-10T18:30:25Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "As the birds dropped out of the sky above the ground station, there might be \nsome objections. What has to happen for long range, gigabit bandwidth, is a wide \nfrequency range with little time on any particular frequency so that there is no \nconcentrated effects on a single frequency where heating would start to occur. \nFrequency hopping over large spectrum is not a new thing, but it's something \nthat could alleviate a number of issues with safety.\n\nGregg Wonderly\nW5GGW\n\nOn 2/10/2014 11:46 AM, Howie DeFelice wrote:\n> Just in case anyone was curious about the practicality of actually transmitting WiFi from a cubesat, I did a quick link budget. Based on typical 802.11 specs, the MDS of a receiver is about -90 dBm. The path loss at 2.4GHz between a ground station and a satellite overhead in a 600Km orbit is a little over 155 dB. Assuming a zero gain antenna on the typical WiFi client radio, the required EIRP from the cubesat is in the neighborhood of 4KW.  I don't think we are quite there yet with current solar cell technology.... not to mention the difficulty keeping the PA cool :)\n>\n> - Howie AB2S   \t\t \t   \t\t\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",
    "attachments": []
}