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GET /hyperkitty/api/list/[email protected]/email/7COVEFEOYO4QZ4664D7RZDWQ4DOZ36MQ/
{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/7COVEFEOYO4QZ4664D7RZDWQ4DOZ36MQ/", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/", "message_id": "[email protected]", "message_id_hash": "7COVEFEOYO4QZ4664D7RZDWQ4DOZ36MQ", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/7COVEFEOYO4QZ4664D7RZDWQ4DOZ36MQ/", "sender": { "address": "clivew (a) zetnet.co.uk", "mailman_id": null, "emails": null }, "sender_name": "Clive Wallis", "subject": "[amsat-bb] OSCAR-11 Report", "date": "2006-09-29T09:29:57Z", "parent": null, "children": [], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "\n OSCAR-11 REPORT\n\n 28 September 2006\n\nNOTHING HEARD FROM OSCAR-11 DURING SEPTEMBER ... REPORTS REQUESTED!\nPlease post reports to AMSAT-BB or e-mail to [email protected] (replace xxxxx\nby g3cwv).\n\nDuring the period 14 August 2006 to 28 September, the satellite was heard\nfrom 16 to 26 August. The beacon was expected to switch ON ten days or 20\nlater, ie. around 05 or 15 September. However, it has not been heard since\n26 August.\n\nDuring the last ON period, the real time clock showed various errors.\nThe date on 16 August was 51 July. By 26 August it had incremented to 60\nJuly. The hours were also showing an erratic behaviour. Over short\nperiods of time, ie. during a pass, the minutes and seconds appeared to\nbe incrementing correctly\n\nI am indebted to Jeff KB2M, Peter ZL3TC and Dave G1OCN, for their\nreports and for monitoring the satellite, especially during the last two\nweeks while I have been away on holiday. Many thanks.\n\nThe status of the satellite, when last heard, was that all the analogue\ntelemetry channels, 0 to 59 are zero, ie they have failed. The status\nchannels 60 to 67 were still working. The spacecraft computer and active\nattitude control system have switched OFF, ie. the satellite' attitude is\ncontrolled only by the passive gravity boom gradient, and the satellite is\nfree to spin at any speed. When telemetry was last received it showed that\none of the solar arrays had failed, and there was a large unexplained\ncurrent drain on the main 14 volt bus. After 22 years in orbit the battery\nhas undergone around 100,000 partial charge/discharge cycles, and\nobservations suggest that it cannot power the satellite during eclipses, or\nsometimes during periods of poor solar attitude.\n\nThe watchdog timer now operates on a 20 day cycle. During the three months\nbefore May (when the eclipses started), the ON/OFF times were very\nconsistent, and the average of many observations show this to be 20.7 days,\nie. 10.3 days ON followed by 10.4 days OFF. However, poor solar attitude\nmay result may result in a low 14 volt line supply, which may cause the\nbeacon to switch OFF prematurely, and reset the watchdog timer cycle. When\nthis 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:U2RPT125.CWV, to prevent duplication.\n\n73 Clive G3CWV [email protected] (please replace xxxxx by g3cwv)\n", "attachments": [] }