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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/XTHOE2OOXMUCD4KEBDYS65PO7UHQC4B5/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "XTHOE2OOXMUCD4KEBDYS65PO7UHQC4B5",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/D3AUPSFGGYRYQWJGBJYHBQAT7T6ULPKN/",
    "sender": {
        "address": "W7IN (a) montana.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Larry Gerhardstein",
    "subject": "[amsat-bb] Re: AO-51 short experiment",
    "date": "2010-10-24T21:00:59Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/KU2HG3GFHXJIS6KTA6IQR3VP3EHPLXEQ/",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "No one 'owns the frequency' and if in-place coordination can not resolve \nthe issue, the newest user should consider moving out of the required \nbandpass.  Was the first user ever coordinated?  ~~Larry W7IN~~\n\nOn 10/24/2010 2:45 PM, Alan P. Biddle wrote:\n> Bob,\n>\n> 145.825 is the \"established\" space APRS frequency, and has been/is used by\n> more than just the ISS for years.  There are other APRS satellites which are\n> intermittently active on the same frequency, and I expect there will be\n> others in the future.  I can't address the formal coordination issue, but\n> anything with an uplink on that frequency is guaranteed to have problems.\n> The only question is whether those problems are tolerable.  There is little\n> to no APRS activity on that frequency over most of the world, and then there\n> is the question of both HO-68 and the ISS being in the same footprint.  The\n> HO-68 has an inclination of about 102 degrees, the ISS about half that.\n> Finally, the ISS is not active on that frequency 24/7.  It operates on other\n> frequencies for voice and SSTV, and is often QRT completely due to other\n> operations.  In an imperfect world, it looks like a reasonable tradeoff,\n> though other evaluations are certainly possible.\n>\n> The problem of unattended APRS beacons does cut both ways.  There are some\n> daylight-only APRS satellites.  When they enter periods of extended\n> illumination, they can be commanded from their default modes.  However, even\n> a single \"braaap\" can pull the DC busses low enough that the command\n> stations need to start over again.  WB4APR has lamented this problem, with\n> specific calls, in other venues.  Looking at some of the paths, both in\n> Drew's example and my reception, there are stations whose paths have not\n> been updated for years.\n>\n> The sort of courtesy/coordination issue is not limited to space operations.\n> A ham relatively local to me fired up a propagation beacon on 30 meters this\n> month.  It is/was within 200 HZ of an APRS frequency which has been in use\n> for some time.  Quite a fight over who \"owns\" the frequency.  ;)\n>\n> Alan\n> WA4SCA\n>\n>\n>\n>\n> _______________________________________________\n> Sent via [email protected]. Opinions expressed are those of the author.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n>\n\n",
    "attachments": []
}