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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/ETHMXU3F5XR75DPZ4L55Z22USZY4UK2Q/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "ETHMXU3F5XR75DPZ4L55Z22USZY4UK2Q",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/ETHMXU3F5XR75DPZ4L55Z22USZY4UK2Q/",
    "sender": {
        "address": "clivew (a) zetnet.co.uk",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Clive Wallis",
    "subject": "[amsat-bb]  OSCAR-11 Report",
    "date": "2008-02-17T15:53:02Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "\n                    OSCAR-11 REPORT\n\n                    17 February 2008\n\nThis report covers the period from 21 January to 17 February 2008,\noverlapping the previous report by a few days, to include the two periods\nof continuous operation..  The satellite was heard from 22 January to 01\nFebruary and from 11 February to 15 February.\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 periods.\n\nThe transmission period which started on 11 February was prematurely\nterminated four days later, on 15 February. If the watchdog timer has\nreset, it should switch-on again around 07 March. There should be a short\nperiod of transmissions before permanent eclipses start in mid March. After\nMarch it is unlikely that the satellite will support any sustained\nperiod of operation, and will only transmit for a short time, possibly less\nathn a single orbit, every 21 days.\n\nThe real time clock now serves as a crude indicator of the state of the\nsatellite. Between 22 and 29 January the clock was stable to within\ntwo seconds.  During the next two days it lost 4.3 hours\n\nBetween 11 and 15 February the real time clock showed a steady loss of\ntime every orbit. During the four days the clock lost 4.8 hours.  When last\nheard the clock was 82.76424 days slow.\n\nI am indebted to Peter ZL3TC, Chris M0DQO, Tobias DG3LV, Edward BX1AD,\nMark KU7Z, Gene WA4UKX, SWL Mark in CM87, Ron G4PGY, Julian WB9YIG and John\nHB2HSH 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:U2RPT142.CWV, to prevent duplication.\n\n73 Clive G3CWV   [email protected] (please replace xxxxx by g3cwv)\n",
    "attachments": []
}