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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/44CVCCS7QJVMBSS35AP2XY4TUWQJYVEZ/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "44CVCCS7QJVMBSS35AP2XY4TUWQJYVEZ",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/44CVCCS7QJVMBSS35AP2XY4TUWQJYVEZ/",
    "sender": {
        "address": "clivew (a) zetnet.co.uk",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Clive Wallis",
    "subject": "[amsat-bb]  OSCAR-11 Report",
    "date": "2007-12-20T09:16:04Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "\n                    OSCAR-11 REPORT\n\n                   20 December 2007\n\nRECEPTION REPORTS REQUESTED!\n\nPlease send reception reports to [email protected] (please replace xxxxx by\ng3cwv) or post to amsat-bb. If you are able to record the satellite as a\nWAV file, please do so, but let me know what you have, before sending it!\n\nIf you need to hear what the satellite sounds like, please visit my website\nwww.users.zetnet.co.uk/clivew/  The satellite transmits on 145.826 MHz. set\nreceiver to NBFM.\n\n                         ---------\n\nDuring the period 15 November to 19 December 2007 no signals have been\nreceived from the satellite.  No reports of reception have been received.\n\nEclipses have continued and are expected until mid January 2008.  Although\nthe maximum duration of the current eclipses is less than those earlier\nthis year, it is doubtful whether the satellite will be heard for any\nsustained period.  While in continuous sunlight during September and\nOctober the satellite was unable to support continuous operation.\n\nIt is likely than the satellite will only be heard by chance, by stations\nlistening for other satellites on 145.826 Mhz.\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.\nMore data is required to determine exactly when the date changes.\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:U2RPT140.CWV, to prevent duplication.\n\n73 Clive G3CWV   [email protected] (please replace xxxxx by g3cwv)\n",
    "attachments": []
}