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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/KDVGKA3WU72DHBTFK6Q4A7QJMX4K4XFA/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "KDVGKA3WU72DHBTFK6Q4A7QJMX4K4XFA",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/KDVGKA3WU72DHBTFK6Q4A7QJMX4K4XFA/",
    "sender": {
        "address": "clivew (a) zetnet.co.uk",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Clive Wallis",
    "subject": "[amsat-bb]  OSCAR-11 Report",
    "date": "2006-12-29T12:30:08Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "\n                    OSCAR-11 REPORT\n\n                   29 December 2006\n\n\nDuring the period 20 November to 29 December, the satellite was heard\nfrom 28 November to 08 December and from 18 to 28 December. Good,\nsteady, often strong, signals have beeen heard on all passes, and\nexcellent copy of the telemetry obtained.\n\nThe date/time stamp has been of continued interest.  Since the satellite\nwas heard on 18 October the on-board clock has maintained accurate time, to\nwithin five seconds over a period of 71 days. This compares with the average\ngain of five seconds per month, recorded when the satellite was fully\noperational.\n\nThe date counter appears to be incrementing correctly, but the day of the\nmonth is not reset to one, at the end of each month, and is not\nincrementing the month counter correctly. During the last OFF period the month\ncounter changed from '10' to '11'. On 28 December the date was shown as 61\nNovember. However, the day of the week counter appears to be incrementing\ncorrectly. Currently, 0 indicates Thursday.\n\nIf the satellite's watchdog timer continues to operate normally, the beacon\nshould switch ON around 08 January 2007. The satellite is in full sunlight\nat the present time, and will remain in this state until mid-April 2007,\nwhen eclipses start again.\n\nI am indebted to Peter ZL3TC, Dean AL7CR, Bob G4VRC and Ken W7KKE  for\ntheir reports. Reports around the times of the expected beacon switch\nON/OFF, are especially useful.  Many thanks.\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 were still working. The spacecraft computer and active attitude control\nsystem have switched OFF, ie. the satellite' attitude is controlled only by\nthe passive gravity boom gradient, and the satellite is free to spin at any\nspeed. When telemetry was last received it showed that one of the solar\narrays had failed, and there was a large unexplained current drain on the\nmain 14 volt bus. After 22 years in orbit the battery has undergone around\n100,000 partial charge/discharge cycles, and observations suggest that it\ncannot power the satellite during eclipses, or sometimes during periods of\npoor solar 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:U2RPT128.CWV, to prevent duplication.\n\n73 Clive G3CWV   [email protected] (please replace xxxxx by g3cwv)\n",
    "attachments": []
}