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{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/VAAC74TN6Q6QVYZHFQ2TXVAGVABP2HMN/?format=api", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api", "message_id": "[email protected]", "message_id_hash": "VAAC74TN6Q6QVYZHFQ2TXVAGVABP2HMN", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/CGQ76XGMTNXP2X2V2W3LFEJSFKVYQHZG/?format=api", "sender": { "address": "wb4gcs (a) wb4gcs.org", "mailman_id": null, "emails": null }, "sender_name": "Jim Sanford", "subject": "Re: [amsat-bb] Geostationary & HEO Satellites", "date": "2019-02-08T22:49:46Z", "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/WHHEHHYN362EV77SHH624EO3S6ZAUG4S/?format=api", "children": [ "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/YFZAF7KA73YBOHZ66HNCFD25MC4UJE2G/?format=api" ], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "Very much what I see with my satellite internet -- if I ping something, \nI see delay between 600 - 800 msec.\n\nJim\n\[email protected]\n\n\nOn 2/8/2019 4:20 PM, Paul Andrews wrote:\n> Simon,\n>\n> I spent 20 years building data circuits using geosynchronous satellites.\n> During that time, my definition of round trip was\n> uplink-dowlink-uplink-downlink or 4 x 150ms (plus or minus a small amount\n> of Doppler).\n>\n> Yes - you're correct - the loopback delay is 300ms. But if you communicate\n> with another person on Earth, the round trip delay is 600ms.\n>\n> If you tell someone a joke, you won't hear the laugh until after a 600ms\n> delay. This is only true for a good joke. Tell a bad joke and the delay\n> will be infinite. :O\n>\n> 73 - Paul - W2HRO\n>\n>\n>\n>\n> On 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>>> 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>>> 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>>> But a geostationary amateur satellite would have many interesting\n>> benefits:\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>>> 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>>> It’s wonderful that they asked us. Dialogue is the key to most human\n>> accomplishment.\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> _______________________________________________\n> Sent via [email protected]. AMSAT-NA makes this open forum available\n> to all interested persons worldwide without requiring membership. Opinions expressed\n> 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\n---\nThis email has been checked for viruses by Avast antivirus software.\nhttps://www.avast.com/antivirus\n\n", "attachments": [] }