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    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/WHHEHHYN362EV77SHH624EO3S6ZAUG4S/?format=api",
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    "message_id": "CAOsf+NT3KjH7tMT-jwOv_cC8Yuj6QT9K6dzaAtdQSm-3RdkxaQ@mail.gmail.com",
    "message_id_hash": "WHHEHHYN362EV77SHH624EO3S6ZAUG4S",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/CGQ76XGMTNXP2X2V2W3LFEJSFKVYQHZG/?format=api",
    "sender": {
        "address": "w2hro.fn20 (a) gmail.com",
        "mailman_id": "56ad9360da124e679a8e571628e4a15d",
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    },
    "sender_name": "Paul Andrews",
    "subject": "Re: [amsat-bb] Geostationary & HEO Satellites",
    "date": "2019-02-08T21:20:26Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/DRBMWFJ3GNZBPNSTVBCVS3LIJRXWWBMW/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/VAAC74TN6Q6QVYZHFQ2TXVAGVABP2HMN/?format=api"
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    "content": "Simon,\n\nI spent 20 years building data circuits using geosynchronous satellites.\nDuring that time, my definition of round trip was\nuplink-dowlink-uplink-downlink or 4 x 150ms (plus or minus a small amount\nof Doppler).\n\nYes - you're correct - the loopback delay is 300ms.  But if you communicate\nwith another person on Earth, the round trip delay is 600ms.\n\nIf you tell someone a joke, you won't hear the laugh until after a 600ms\ndelay.  This is only true for a good joke.  Tell a bad joke and the delay\nwill be infinite.  :O\n\n73 - Paul - W2HRO\n\n\n\n\nOn Fri, Feb 8, 2019, 16:09 Simon Brown <[email protected]> wrote:\n\n> Paul,\n>\n> Unless there's significant latency inside the satellite, I think you're\n> out by a factor of two. Round trip is 2 x 40,000 km (*) = 80,000 km total.\n> 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>\n> Simon Brown, G4ELI\n> www.sdr-radio.com\n>\n>\n> -----Original Message-----\n> From: AMSAT-BB <[email protected]> On Behalf Of Paul Andrews\n> Sent: 08 February 2019 19:27\n> To: Les Rayburn <[email protected]>\n> Cc: AMSAT BB <[email protected]>\n> Subject: Re: [amsat-bb] Geostationary & HEO Satellites\n>\n> GEOSATs have another interesting characteristic.   600 ms round trip\n> delay due to the longer distance.\n>\n> Does anyone remember when MCI first started providing a discounted long\n> distance telephone service?\n>\n> This will make voice QSOs a little unnatural but certainly not impossible.\n>\n> 73 - Paul - W2HRO\n>\n>\n>\n>\n>\n> On 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\n> responded to the survey, but wanted to comment further regarding\n> geostationary and HEO satellites.\n> >\n> > In the camp of “Both, please.” The HEO birds would once again offer the\n> possibility of DXCC and make WAS more realistic—it also offers more\n> operating challenges.\n> >\n> > But a geostationary amateur satellite would have many interesting\n> benefits:\n> >\n> > Provide an easier introduction to satellite operation, and attract new\n> 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\n> band is always open.\n> >\n> > I’m grateful for anyone who incorporates amateur radio into their\n> satellites, but feel that birds should include either linear, digital, or\n> FM transponders whenever possible. Designers are asking a lot of hams when\n> they solicit our monitoring their telemetry signals, and using amateur\n> spectrum for their purposes without much tangible benefit to us. My opinion\n> only.\n> >\n> > It’s wonderful that they asked us. Dialogue is the key to most human\n> 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\n> the official views of AMSAT-NA.\n> > Not an AMSAT-NA member? Join now to support the amateur satellite\n> program!\n> > Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb\n> _______________________________________________\n> Sent via [email protected]. AMSAT-NA makes this open forum available to\n> all interested persons worldwide without requiring membership. Opinions\n> expressed are solely those of the author, and do not reflect the official\n> 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>\n> _______________________________________________\n> Sent via [email protected]. AMSAT-NA makes this open forum available\n> to all interested persons worldwide without requiring membership. Opinions\n> expressed\n> are solely those of the author, and do not reflect the official views of\n> 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>\n",
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