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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/OBAL6XM22H4HMHGFSDXJHNDY4AYQLZR7/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "CAKXf1rGGYuCQ5Xp82yB214WPcZKH8MRhmrLACBJJjYnPS2-ORQ@mail.gmail.com",
    "message_id_hash": "OBAL6XM22H4HMHGFSDXJHNDY4AYQLZR7",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/T4GPAXGCJHWREFWVFXBRP3G66DSFREU6/",
    "sender": {
        "address": "wouterweg (a) gmail.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Wouter Weggelaar",
    "subject": "Re: [amsat-bb] Tracking EO 79",
    "date": "2016-11-14T19:14:41Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/QOSSR7DOG36IQ66KGOVAXXOOVJ4OFUGO/",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi Steve,\n\nSpot on. Is is indeed a set of timers running off the eclipse\ndetection, and this will indeed make the on time drift.\nWe have not decided yet how to handle the drift, and we are still\ncharacterizing the behavior of the transponder and its effect on the\npower budget.\n\nWe are looking for longer term trends, as the utilization of the\ntransponder varies quite a lot in the short term. If we are power\npositive enough, we may for instance lengthen the activation period.\n\nBut we also need to still do things like getting housekeeping and\nwhole orbit data down, and detumble the satellite periodically.\n\nWe will see how this develops over time!\n\nWouter PA3WEG\n\nOn Mon, Nov 14, 2016 at 4:07 PM, Greene, Stephan A\n<[email protected]> wrote:\n> Yes, AO-27 used a similar technique (\"TEPR\") beginning not long after\n> launch and for similar reasons - a computationally easy (for the\n> satellite) way to control the transmitter (time after exiting eclipse)\n> to ensure a positive power budget.  Although the link to the original\n> page on amsat.org explaining it is broken,  a copy was posted here:\n> http://www.om3ktr.sk/druzice/teprstates.html    The diagram assumes the\n> satellite orbit is counter-clockwise and the \"on\" times are for\n> descending node (North to South) passes.  Re-order the segments for\n> ascending node (South the North).  The AO-27 command team later replaced\n> \"TEPR\" with \"TOPR\", using an algorithm based on when the satellite is\n> over the desired latitude band - easier for humans to understand, more\n> calculating on the satellite.  (Guessing this occurred in late\n> 1996-early 1997 based on amsat-bb email archives)\n>\n> The EO-79 control ops will have to adjust the timer settings in the\n> satellite's software periodically to keep the transponder's \"on\" time\n> roughly over the same latitude range.  Otherwise, as was experienced\n> with AO-27, the band of latitudes where the transponder is on will\n> \"drift\" seasonally.  It will move South approaching the Northern\n> hemisphere winter solstice next month, and move North until the summer\n> solstice.\n>\n> 73 Steve KS1G\n>\n> -----Original Message-----\n> From: Greg D [mailto:[email protected]]\n> Sent: Saturday, November 12, 2016 2:41 PM\n> To: Amsat BB\n> Subject: Re: [amsat-bb] Tracking EO 79\n>\n> Didn't AO-27 do something very similar?  There was an application for it\n> that did the calculations.  I forget who the author was; perhaps it (the\n> program, not the author) could be modified for EO-79?\n>\n> Greg  KO6TH\n>\n>\n> Paul Stoetzer wrote:\n>> It's basically calibrated for mid-northern latitudes now, so we should\n>> hear it on daytime NA passes.\n>>\n>> It wouldn't be difficult to write a script to calculate on and off\n> times.\n>>\n>> 73,\n>>\n>> Paul, XE3/N8HM (currently in Progreso, Yucatán, Mexico)\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. 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",
    "attachments": []
}