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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/RLOBCG5KLZJCUCFIFEITKPBQ56W7RFDX/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "RLOBCG5KLZJCUCFIFEITKPBQ56W7RFDX",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/RLOBCG5KLZJCUCFIFEITKPBQ56W7RFDX/",
    "sender": {
        "address": "amsat (a) g3cwv.co.uk",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Clive Wallis",
    "subject": "[amsat-bb]  OSCAR-11 Report",
    "date": "2010-02-24T15:55:11Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "         OSCAR-11 REPORT\n\n         24 February 2010\n\nThis report covers the period from 11 January to 23 February 2010. \nDuring this time the satellite was heard from 21 to 31 January and 11 to \n24February. Good signals were received, and decoded. Signals have been \nvery strong, although frequent changes in polarisation have been \nobserved. The satellite has only transmitted when in sunlight.\n\nThe next transmissions are expected around 04 March 2010.\n\nThe on-board clock was 260 days slow, when last heard on 21 February. \nThe increasing error suggests that the clock may be stopping, when the\nsatellite is in eclipse. Sometimes, the date counter also fails to\nincrement.\n\nReception reports have been received from stations located all over the\nworld including Peter Zl3TC, Jon 2M0IBO, Mike DK3WN, Adrian LU1CBG, \nRobert VE2PRS, Ken GW1FKY and Alan ZL2BX. Many thanks to everyone who \nsent email reports, posted to AMSAT-BB or updated the KD5QGR/WB4APR \nsatellite status website.\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\n                    -------------\n\nRECEPTION REPORTS REQUESTED!\n\nI am particularly interested in reports of reception during the hours \n23:00 to 06:00 and 12:00 to 17:00 UTC, especially near expected switch \non or off dates.\n\nPlease send reception reports to [email protected] (replace xxxxx by\ng3cwv) or post to amsat-bb. If you have a file, please do not send it \nbut let me know what is available.\n\nYou may also like to add your reception report to the live satellite \nstatus page, on the website set up by David KD5QGR and Bob WB4APR. The \nURL is http://oscar.dcarr.org/index.php\n\nThe satellite transmits on 145.826 MHz., set receiver to NBFM. OSCAR-11\nhas a characteristic sound, rather like raspy slow morse code, sending\n\"di di dah dah dah dah dah dah dah\" sent over five seconds. If you are\nreceiving a very weak signal, switch the receiver to CW or SSB. You\nshould hear several sidebands around the carrier frequency, and should \nbe able to hear the characteristic 'morse code like' sound on at least \none sideband.\n\nPlease note that you need a clean noise free signal to decode the signals.\nThere is an audio clip on my website www.g3cwv.co.uk which may be useful\nfor identification and as test signal for decoding.\n\n                     -------------\n\nThe satellite is now subject to eclipses during every orbit. Long term\npredictions indicate that eclipses will occur until 2019, when there \nwill be some eclipse free periods until 2023. However these very long \nterm predictions should be regarded with caution, as large tracking \nerrors can accumulate over long periods of time.\n\nWhen eclipses started around 2005 the watchdog timer often switched the\ntransmitter off before the ten day on period had finished, during parts\nof the\neclipse cycle. When eclipses became a permanent feature of all orbits,\nafter April 2008, the transmitter switched off within a single orbit, \nthus the satellite was effectively non operational.\n\nThe satellite unexpectedly started regular transmissions in November \n2009. It is possible that a fault has developed, which prevents the \nwatchdog timer resetting when the power supply fails. The transmitter \nswitches off during eclipses, and the real time clock stops during most \nof the eclipse.\n\nWhen analogue telemetry was last received, in 2005, it showed that one \nof the solar arrays had failed, and there was a large unexplained \ncurrent drain on the main 14 volt bus. After 25 years in orbit the \nbattery has undergone over 100,000 partial charge/discharge cycles, and \nobservations indicate that it cannot power the satellite during eclipses.\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 \nto 67 are still working. The real time clock is showing a large \naccumulated error, although during ten minute passes the clock \nincrements correctly to within one second. The day of the month has a \nbit stuck at 'one' so the day of the month may show an error of +40 days \nfor some dates. The time display has switched into 12 hour mode. \nUnfortunately, there is no AM/PM indicator, since the time display \nformat was designed for 24 hour mode.\n\nThe spacecraft computer and active attitude control system have switched\nOFF, ie. the satellite' attitude is controlled only by the passive \ngravity boom gradient, and the satellite is free to spin at any speed.\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 \nto be 20.7 days, ie. 10.3 day s ON followed by 10.4 days OFF.\n\nListeners to OSCAR-11 may be interested in visiting my website. If you \nneed to know what OSCAR-11 should sound like, there is a short audio \nclip for you to hear. The last telemetry received from the satellite is \navailable for download. The website contains an archive of news & \ntelemetry data which is updated from time to time. It also contains \ndetails about using a soundcard or hardware demodulators for data \ncapture. There is software for capturing data, and decoding ASCII \ntelemetry. The URL is www.g3cwv.co.uk .\n\nIf you place this bulletin on a terrestrial packet network, please\nuse the bulletin identifier $BID:U2RPT147.CWV, to prevent duplication.\n\n73 Clive G3CWV [email protected] (please replace xxxxx by g3cwv)\n",
    "attachments": []
}