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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/DRBMWFJ3GNZBPNSTVBCVS3LIJRXWWBMW/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "DRBMWFJ3GNZBPNSTVBCVS3LIJRXWWBMW",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/CGQ76XGMTNXP2X2V2W3LFEJSFKVYQHZG/?format=api",
    "sender": {
        "address": "simon (a) sdr-radio.com",
        "mailman_id": "7ad433ec4db746178aa134ed7c5517b4",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/7ad433ec4db746178aa134ed7c5517b4/emails/?format=api"
    },
    "sender_name": "Simon Brown",
    "subject": "Re: [amsat-bb] Geostationary & HEO Satellites",
    "date": "2019-02-08T21:07:30Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/DH55PGZW2GCJDIFCSC4YB3L7R33UILPE/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/WHHEHHYN362EV77SHH624EO3S6ZAUG4S/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Paul,\n\nUnless there's significant latency inside the satellite, I think you're out by a factor of two. Round trip is 2 x 40,000 km (*) = 80,000 km total. Speed of light and radio latency says we're looking at closer to 300 ms.\n\n(*) depending on where you are on the mother planet.\n\nSimon Brown, G4ELI\nwww.sdr-radio.com \n\n\n-----Original Message-----\nFrom: AMSAT-BB <[email protected]> On Behalf Of Paul Andrews\nSent: 08 February 2019 19:27\nTo: Les Rayburn <[email protected]>\nCc: AMSAT BB <[email protected]>\nSubject: Re: [amsat-bb] Geostationary & HEO Satellites\n\nGEOSATs have another interesting characteristic.   600 ms round trip\ndelay due to the longer distance.\n\nDoes anyone remember when MCI first started providing a discounted long distance telephone service?\n\nThis will make voice QSOs a little unnatural but certainly not impossible.\n\n73 - Paul - W2HRO\n\n\n\n\n\nOn Fri, Feb 8, 2019 at 12:21 PM Les Rayburn <[email protected]> wrote:\n>\n> I’m also a newcomer to the birds, but very excited about it. Likewise, I responded to the survey, but wanted to comment further regarding geostationary and HEO satellites.\n>\n> In the camp of “Both, please.” The HEO birds would once again offer the possibility of DXCC and make WAS more realistic—it also offers more operating challenges.\n>\n> But a geostationary amateur satellite would have many interesting benefits:\n>\n> Provide an easier introduction to satellite operation, and attract new operators.\n> Excellent tool for emergency communications during a natural disaster.\n> Opportunity to experiment with microwave operations.\n> The ability to enjoy satellite operation any time of the day/night. The band is always open.\n>\n> I’m grateful for anyone who incorporates amateur radio into their satellites, but feel that birds should include either linear, digital, or FM transponders whenever possible. Designers are asking a lot of hams when they solicit our monitoring their telemetry signals, and using amateur spectrum for their purposes without much tangible benefit to us. My opinion only.\n>\n> It’s wonderful that they asked us. Dialogue is the key to most human accomplishment.\n>\n>\n> 73,\n>\n> Les Rayburn, N1LF\n> Maylene, AL\n> EM63nf\n> AMSAT #38965, ARRL Life Member, CVHS Life Member, SVHF Member\n>\n>\n>\n>\n> _______________________________________________\n> Sent via [email protected]. AMSAT-NA makes this open forum available \n> to all interested persons worldwide without requiring membership. \n> Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb\n_______________________________________________\nSent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA.\nNot an AMSAT-NA member? Join now to support the amateur satellite program!\nSubscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb\n\n",
    "attachments": []
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