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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/K4WEEK4Q37DWVGI7E23W7K5BTFDYHEE6/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "K4WEEK4Q37DWVGI7E23W7K5BTFDYHEE6",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/K4WEEK4Q37DWVGI7E23W7K5BTFDYHEE6/",
    "sender": {
        "address": "clivew (a) zetnet.co.uk",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Clive Wallis",
    "subject": "[amsat-bb]  OSCAR-11 Report",
    "date": "2007-02-15T08:45:21Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "\n                    OSCAR-11 REPORT\n\n                   15 February 2007\n\nTELEMETRY & NEWS ARCHIVES\n\nI have now uploaded an archive of the telemetry for 2006 to my website.\nThe zip package contains 86 individual telemetry files. The names of the\nfiles are date coded, and there are accurate date/time stamps within the\ndata.  I have also uploaded an archive of all these reports for 2006, as a\nsingle file.  www.users.zetnet.co.uk/clivew/\n\nTELEMETRY AND REPORTS WANTED!\n\nTo investigate the on-board clock's hour problem, mentioned below, I would\nwelcome some telemetry from differents parts of the world, at times when\nthe orbits do not pass over the UK. These times are approximately from\n10:00 to 16:00 and from 19:00 to 04:00 UTC. If you don't have a decoder, I\ncan now accept short WAV files of good audio, duration up to 30 seconds.\n\nI would also like reports of reception around the times of expected beacon\nswitch ON and OFF. No telemetry wanted, just when you listen, and whether\nyou heard, or didn't hear the bird. Please e-mail to the address below.\n\n                     --------------------\n\nDuring the period 23 January to 14 February 2007, the satellite was heard\nfrom 28 January to 08 February. Good steady signals have beeen heard on\nmost passes, and good copy of the telemetry obtained.\n\nThe on-board clock has maintained accurate time. Over the reporting period,\nno change could be detected! However the hour counter sometimes shows an\nerror of of 10 hours, ie. in its most significent digit. The 'day of the\nweek' counter operates reliably, zero representing Thursday.\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.  On 07 February it\nreset to 41, showing that the unused bit representing 40 permanently is\nstuck at a one. This means that the clock error is now 37.21453 days\nslow.\n\nIf the satellite's watchdog timer continues to operate normally, the beacon\nshould switch ON around 18/19 February 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 David G8OQW, Mark KU7Z, Jay KD4QoV, Etienne ZS6Y, Jeff\nKB2M and Geoff ZL6GA for their reports. 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 are 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:U2RPT130.CWV, to prevent duplication.\n\n73 Clive G3CWV   [email protected] (please replace xxxxx by g3cwv)\n",
    "attachments": []
}