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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/VTPNJOQBCHPZWQHOWBQGXJBPS3KKT6RD/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "VTPNJOQBCHPZWQHOWBQGXJBPS3KKT6RD",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/VTPNJOQBCHPZWQHOWBQGXJBPS3KKT6RD/",
    "sender": {
        "address": "clivew (a) zetnet.co.uk",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Clive Wallis",
    "subject": "[amsat-bb]  OSCAR-11 Report",
    "date": "2008-01-26T16:47:51Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "\n                    OSCAR-11 REPORT\n\n                    26 January 2008\n\n\nThis report covers the period from 19 December 2007 to 26 January 2008.\nAfter two months of silence from 20 November, when eclipses started, the\nsatellite resumed transmissions on 22 January 2008. This was three complete\n20.7 day watchdog cycles after the satellite switched off. At the time of\nwriting signals are consistantly strong, although the polarisation is very\nvariable, with a cycle time of around 20 seconds, causing deep fading if\nthe antenna polarisation is fixed. This suggests that the satellite may be\ntumbling.\n\nIf the current watchdog cycle continues uninterrupted, the 145.826 Mhz.\nbeacon should switch off around 01 February and on again around 11\nFebruary. However, if low battery voltage causes the watchdog timer to\nreset, then the beacon should switch on 21 days later.\n\nThe real time clock in now very stable although it has lost a further 7.09\ndays since 20 November. On 26 January it is 81.36403 days slow.\n\nI am indebted to Peter ZL3TC, Mark KU7Z, Gene WA4UKX, SWL Mark in CM87, Ron\nG4PGY, Julian WB9YIG, John HB2HSH and Edward BX1AD for their reports. Many\nthanks.\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.\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:U2RPT141.CWV, to prevent duplication.\n\n73 Clive G3CWV   [email protected] (please replace xxxxx by g3cwv)\n",
    "attachments": []
}