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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/JAQH4IFBQE6VKW3SYEFERKVQVLFPN5LA/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "JAQH4IFBQE6VKW3SYEFERKVQVLFPN5LA",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/JAQH4IFBQE6VKW3SYEFERKVQVLFPN5LA/",
    "sender": {
        "address": "clivew (a) zetnet.co.uk",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Clive Wallis",
    "subject": "[amsat-bb]  OSCAR-11 Report",
    "date": "2007-03-23T16:14:44Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "\n                    OSCAR-11 REPORT\n\n                   23 March 2007\n\nOSCAR-11 celebrated it's 23rd birthday on 01 March 2007.  Congratulations\nto Professor Sir Martin Sweeting G3YJO, his team at the University of\nSurrey and associated radio amateurs for their magnificient achievement.\n\nDuring the period 14 February to 22 March 2007, the satellite was heard\nfrom 18  to 28 February and from 11 to 21 March .  Good steady signals\nhave beeen heard on most passes, and good copy of the telemetry obtained.\n\nThe on-board clock has comntinued to maintain accurate time. However,\nthere are two problems with the date and time display in the ASCII\ntelemetry.  Firstly, the date counter appears to be incrementing correctly,\nbut the day of the month is reset to 41, at the end of each month, instead\nof being reset to one. A likely cause is that the unused bit\nrepresenting 40 in the ASCII code for the day of the month, is permanently\nstuck at a one. This may be related to the '0=' display error when the\nmonth was 09, previously reported.\n\nThe second problem, is that the hours are incorrectly counting and/or\ndisplayed. Since August 2006, the hour count has never exceeded 12.\nDuring one pass recently the hour count changed from 12 to 01\ninstead of to 13! A possible explanation is that the time/date chip has\ntwo modes of operation, which are switchable between 12 or 24 hour modes.\nAn internal chip fault or an external circuit fault may have switched the\nchip into the 12 hour mode.\n\nInvestigating this problem has been difficult, because the satellite\npasses over the UK at roughly the same times, each day, and only a limited\nnumber of pass times are available for analysis. If the above explanation\nis correct, the date changes around 04:47 UTC, each day.\n\nThe 'day of the week' counter operates reliably, zero representing\nThursday. At the present time the total clock error is 37.21444 days slow.\n\nIf the satellite's watchdog timer continues to operate normally, the beacon\nshould switch ON around 31 March/ 01 April 2007. The satellite is in full\nsunlight at the present time, and will remain in this state until\n20 April 2007, when eclipses start again. The eclipses are expected to\ncontinue until 23 August, and if the satellite performs as it did last\nyear, it is unlikely to be heard, for any length of time, during the\neclipse season.\n\nI am indebted to David VK5DG, David G8OQW, Etienne ZS6Y, Jeff KB2M, Geoff\nZL6GA, Edward BX1AD, and Sil ZL2CIA 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:U2RPT131.CWV, to prevent duplication.\n\n73 Clive G3CWV   [email protected] (please replace xxxxx by g3cwv)\n",
    "attachments": []
}