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GET /hyperkitty/api/list/[email protected]/email/2QBJN56RGE2WYYGK3ZGTK4NRQWFNU3DH/
{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/2QBJN56RGE2WYYGK3ZGTK4NRQWFNU3DH/", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/", "message_id": "[email protected]", "message_id_hash": "2QBJN56RGE2WYYGK3ZGTK4NRQWFNU3DH", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/2QBJN56RGE2WYYGK3ZGTK4NRQWFNU3DH/", "sender": { "address": "ki4rdt (a) yahoo.com", "mailman_id": "7f4a0ddb14af47a1aad5227afdaa7960", "emails": "https://mailman.amsat.org/hyperkitty/api/sender/7f4a0ddb14af47a1aad5227afdaa7960/emails/" }, "sender_name": "charlie Cantrill", "subject": "[amsat-bb] Re: New Satellite Downlink?", "date": "2010-08-26T01:00:35Z", "parent": null, "children": [], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "Would it be possible to allow students/hams around the world to send a text message to ground stations? This would be especially handy to those students/instructors who cannot send APRS packets to sats to generate interest and outreach. What about adding this feature in addition to sending bulletins of satellite users interest.\n\nCharlie CantrillKI4RDTInstructor, Nelson County Area Technology Center\n\n\n\n\n\nDate: Wed, 25 Aug 2010 12:27:00 -0400\nFrom: \"Robert Bruninga\" <[email protected]>\nSubject: [amsat-bb] New Satellite Downlink?\nTo: <[email protected]>\nMessage-ID: <[email protected]>\nContent-Type: text/plain; charset=\"us-ascii\"\n\nPossible new AMSAT Application?\n\nWe may have access to two old TRANSIT navigation satellites with\na 50 baud downlink at 149.985 (and 400 MHz). (presently coming\nover in the mid afternoon). My problem is, coming up with any\nmeaningful application to use them for communications that would\ncapture the interest of students, hams or volunteers in support\nof education, public service or emergency comms or just plain\nfun... \n\nThe downlink can be heard on an OMNI antenna (though I would\nsuggest a 3/4 wave (55\") vertical) and could be decoded by a\nsimple software only application with a sound card. (someone has\nto write it)...\n\nThe total useful message capability is about 500 bytes\ntransmitted every 2 minutes (at 50 baud). The uplink is very\nspecialized and can ONLY BE DONE from one (or two) very special\ncommmand stations. These satellites of course were the original\nNavy Navigation satellite system (also called OSCARS) and so the\nmessage would be in-place of the normal navigation data. SO in\na sense, this is a downlink BROADCAST application. Since ham\nradio is two way, I'm stumped for applications.\n\nThe total message capability of 500 Bytes can contain one long\nARRL bulletin, or 20 APRS position/status reports, or say 20 or\nso APRS text messages, or say 50 \"callsign exchanges\" or maybe\neven 1 thumbnail image... but what's the application?\n\nEven if we allow say, INTERNET link to the command station for\n\"anyone\" to contribute to the twice per-day upload, then\neveryone's receiver application can receive them... For what?\n\nSo Im looking for ideas. All I can come up with so far is:\n1) ARRL Bulletins? (I don't even know how often ARRL sends\nbulletins...)\n2) Navy/Army/AF MARS broadcast bulletins...\n3) Internet message in-to-command-upload-to message RF downlink.\nTwo stations do this to each other and it counts as a two-way\nQSO?\n4) ...\n\nEvery scenario of interest usually begins with the much higher\nvalue of UPLINK from the individual field station, not\ndownlink.. Hence I am stumped.\n\nHUMMH... Maybe purely educational? If the software can run on\nany PC with a sound card connected to any scanner... Then every\nschool can use it as a satellite downlink signal of interest..\nWhat kind of thumbnail image can fit in 500 bytes? Send in your\npicture and get it downlinked on a given day?\n\nEtc..\n\nWill need a DSP volunteer to write the sound card decoder. \n\nBob, WB4APR\n\n\n\n\n\n\n\n \n", "attachments": [] }