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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/MUPUIFYGBPMASZWOQVPHOUW2Y5LCOBRD/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "MUPUIFYGBPMASZWOQVPHOUW2Y5LCOBRD",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/MUPUIFYGBPMASZWOQVPHOUW2Y5LCOBRD/",
    "sender": {
        "address": "clivew (a) zetnet.co.uk",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Clive Wallis",
    "subject": "[amsat-bb]  OSCAR-11 Report",
    "date": "2008-03-17T11:44:54Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "\n                    OSCAR-11 REPORT\n\n                    17 March 2008\n\nOSCAR-11 celebrated its 24th birthday on 01 March 2008.  It was designed,\nbuilt and launched, within a time scale of six months, using commercially\navailable components. Congratulations to Professor Sir Martin Sweeting\nG3YJO, his team at the University of Surrey and associated groups of radio\namateurs, for their magnificient achievement.\n\nThis report covers the period from 17 February to 17 March 2008.  The\nsatellite was heard from 03 to 13 March. Previously the\ntransmissions which started on 11 February were terminated prematurely\nafter only four days. The watchdog timer cycle appears to have continued\nfor its full 21 days, thus restarting transmissions on 03 March.\n\nSignals have been very variable in strength sometimes very strong,\nsometimes undetectable, even at high elevations. Low signal strength was\nparticularly noticeable at AOS and LOS, and also towards the end of the\ntransmission period, which on this occasion, lasted the full ten days.\n\nThe next transmissions should start on 24 March. However, permanent\neclipses start a few days beforehand, which will probably cause the\ntransmission period to be terminated prematurely, and may even prevent it\nbeing heard at all. After March it is unlikely that the satellite will\nsupport any sustained period of operation, and will only transmit for a\nshort time, possibly less than a single orbit, every 21 days.\n\nThe real time clock now serves as a crude indicator of the state of the\nsatellite. Between 04 and 13 March showed an average loss of over two hours\nper day. time every orbit. When last heard the clock was 83.0958 days slow.\n\nI am indebted to Peter ZL3TC, Mark KU7Z, John KB2HSH, Antonio EA1CXG,\nEdward BX1AD and Andrew VK5LAC  for their reports. Many thanks.\n\nThe satellite is now in continuous sunlight, and this is expected to\ncontinue until mid March, when eclipses will start again. Unfortunately\neclipses will then become a permanent feature of the orbit, which is likely\nto prevent any periods of sustained operation after March.\n\nThe current status of the satellite, is that all the analogue telemetry\nchannels, 0 to 59 are zero, ie they have failed. The status channels 60 to\n67 are still working. The real time clock is showing a large accumulated\nerror, although over short periods timekeeping is accurate to a few\nseconds per month.  The day of the month has a bit stuck at 'one' so the\nday of the month may show an error of +40 days for some dates.  The time\ndisplay has switched into 12 hour mode. Unfortunately, there is no AM/PM\nindicator, since the time display format was designed for 24 hour mode.\n\nThe spacecraft computer and active attitude control system have switched\nOFF, ie. the satellite' attitude is controlled only by the passive gravity\nboom gradient, and the satellite is free to spin at any speed. When\ntelemetry was last received it showed that one of the solar arrays had\nfailed, and there was a large unexplained current drain on the main 14 volt\nbus. After 23 years in orbit the battery has undergone around 100,000\npartial charge/discharge cycles, and observations suggest that it cannot\npower the satellite during eclipses, or sometimes during periods of poor\nsolar attitude.\n\nThe watchdog timer now operates on a 20 day cycle. The ON/OFF times have\ntended to be very consistent. The average of many observations show this to\nbe 20.7 days, ie. 10.3 days ON followed by 10.4 days OFF. However, poor\nsolar attitude may result may result in a low 14 volt line supply, which\nmay cause the beacon to switch OFF prematurely, and reset the watchdog\ntimer cycle. When this occurs, the beacon is OFF for 20.7 days.\n\nThe Beacon frequencies are -\n\nVHF 145.826 MHz.  AFSK FM  ASCII Telemetry\n\nUHF 435.025 MHz.  OFF\n\nS-band 2401.5 MHz. OFF\n\nListeners to OSCAR-11 may be interested in visiting my website. If you need\nto know what OSCAR-11 should sound like, there is a short audio clip for\nyou to hear. There is an example of the latest telemetry received from the\nsatellite. The website contains an archive of news & telemetry data. It\nalso contains details about using a soundcard or hardware demodulators for\ndata capture.  There is software for capturing data, and decoding ASCII\ntelemetry.  The URL is www.users.zetnet.co.uk/clivew/\n\nIf you place this bulletin on a terrestrial packet network, please\nuse the bulletin identifier $BID:U2RPT143.CWV, to prevent duplication.\n\n73 Clive G3CWV   [email protected] (please replace xxxxx by g3cwv)\n",
    "attachments": []
}