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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/LIP7Z4A6F6QN4JDQL457IJ4Y6DULJIJV/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "LIP7Z4A6F6QN4JDQL457IJ4Y6DULJIJV",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/LIP7Z4A6F6QN4JDQL457IJ4Y6DULJIJV/",
    "sender": {
        "address": "clivew (a) zetnet.co.uk",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Clive Wallis",
    "subject": "[amsat-bb]  OSCAR-11 Report",
    "date": "2007-09-28T09:35:45Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "\n                    OSCAR-11 REPORT\n\n                   27 September 2007\n\nOSCAR-11 is back! During the period 31 August to 27 September 2007, the\nsatellite's 145.826 MHz. beacon has been heard from 16 to 26 September. The\nswitch-on date was later than expected. The solar eclipses finished on 20\nAugust, and previous observations had suggested that the duration of\nsunlight after 10 August would be sufficient to support continuous\noperation. However, at the end of last year's eclipse season, some erratic\nbehaviour was also observed.\n\nUnfortunately I was away on holiday when the satellite first switched ON,\nand only received the data on last two days of transmission.  Signals were\nweaker than those received earlier in the year, ie. before the eclipse\nseason.  This has been confirmed by the many reports I have received.\n\nThe on-board clock has continued to be of interest.  At the end of this ON\nperiod the clock was 69.43451 days slow, showing a loss of about 31 days\nsince the previous ON period.  The day of the week counter appears to be\nconsistant with the date on the satellite, but has changed in relation to\nthe actual date.  Previously, 0 represented Thursday, now it represents\nMonday.\n\nIf the satellite's watchdog timer continues to operate normally, the beacon\nshould switch ON around 06 October 2007.\n\nI am indebted to Peter ZL3TC, Ken W7KKE, Dave G1OCN, Jef KB2M, Graham\nG3VZV, Martin M0ADY, Gustavo LW2DTZ, John N7ZL, John N3NKC and Thomas\nHB9SKA for their reports. They were especially useful while I have been\naway.  Many thanks.\n\nThe satellite is  now in continuous sunlight and this will continue until\naround 14 November, when there will be a short eclipse season, lasting\nuntil around 07 January. However the maximum duration of the eclipses will\nonly be about seven ninutes. At this level the satelite might just survive.\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 22 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. 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:U2RPT137.CWV, to prevent duplication.\n\n73 Clive G3CWV   [email protected] (please replace xxxxx by g3cwv)\n",
    "attachments": []
}