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GET /hyperkitty/api/list/[email protected]/email/MICW77I7YDXFWDSBTV2AI35X726JRMSU/
{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/MICW77I7YDXFWDSBTV2AI35X726JRMSU/", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/", "message_id": "[email protected]", "message_id_hash": "MICW77I7YDXFWDSBTV2AI35X726JRMSU", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/D3AUPSFGGYRYQWJGBJYHBQAT7T6ULPKN/", "sender": { "address": "nk7i (a) yahoo.com", "mailman_id": "042f976a59f34f518d0e63ec1ad69204", "emails": "https://mailman.amsat.org/hyperkitty/api/sender/042f976a59f34f518d0e63ec1ad69204/emails/" }, "sender_name": "Bob Herrell", "subject": "[amsat-bb] Re: AO-51 short experiment", "date": "2010-10-24T22:02:24Z", "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/KU2HG3GFHXJIS6KTA6IQR3VP3EHPLXEQ/", "children": [ "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/ZHJMNCOYISGGTRNWENIX47VAESDRNAOR/" ], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "Alan,\n\nI agree with you totally. It is going to be an ongoing problem and unless \nindividual operators take responsibility for their emissions, it is going to \ncontinue. Even with coordination the frequency is still not owned by any \nparticular station. It is just common courtesy that we need to show to each \nother. Are these APRS stations just beaconing in hopes of hitting the ISS or are \nthey in use for normal APRS? I don't see 145.825MHz being used as a terrestrial \nfrequency. I can understand the problem when HO-68 and the ISS are in the same \nfootprint, but to run a station continuously on 145.825MHz is crazy. I do send \npackets to the ISS myself, but ONLY when it is in view and turned on. It all \nboils down to the old idea of \"Listen before you talk\".\n\n73,\nBob\nAJ5C\n\n\n________________________________\nFrom: Alan P. Biddle <[email protected]>\nTo: Bob Herrell <[email protected]>; [email protected]\nSent: Sun, October 24, 2010 3:45:18 PM\nSubject: RE: [amsat-bb] Re: AO-51 short experiment\n\nBob,\n\n145.825 is the \"established\" space APRS frequency, and has been/is used by\nmore than just the ISS for years. There are other APRS satellites which are\nintermittently active on the same frequency, and I expect there will be\nothers in the future. I can't address the formal coordination issue, but\nanything with an uplink on that frequency is guaranteed to have problems.\nThe only question is whether those problems are tolerable. There is little\nto no APRS activity on that frequency over most of the world, and then there\nis the question of both HO-68 and the ISS being in the same footprint. The\nHO-68 has an inclination of about 102 degrees, the ISS about half that.\nFinally, the ISS is not active on that frequency 24/7. It operates on other\nfrequencies for voice and SSTV, and is often QRT completely due to other\noperations. In an imperfect world, it looks like a reasonable tradeoff,\nthough other evaluations are certainly possible.\n\nThe problem of unattended APRS beacons does cut both ways. There are some\ndaylight-only APRS satellites. When they enter periods of extended\nillumination, they can be commanded from their default modes. However, even\na single \"braaap\" can pull the DC busses low enough that the command\nstations need to start over again. WB4APR has lamented this problem, with\nspecific calls, in other venues. Looking at some of the paths, both in\nDrew's example and my reception, there are stations whose paths have not\nbeen updated for years. \n\nThe sort of courtesy/coordination issue is not limited to space operations.\nA ham relatively local to me fired up a propagation beacon on 30 meters this\nmonth. It is/was within 200 HZ of an APRS frequency which has been in use\nfor some time. Quite a fight over who \"owns\" the frequency. ;)\n\nAlan\nWA4SCA\n\n\n \n", "attachments": [] }