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GET /hyperkitty/api/list/[email protected]/email/PK7P47V6VDOWKLJD6RPHF2DDVHXD2UBI/?format=api
{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/PK7P47V6VDOWKLJD6RPHF2DDVHXD2UBI/?format=api", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api", "message_id": "[email protected]", "message_id_hash": "PK7P47V6VDOWKLJD6RPHF2DDVHXD2UBI", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/CBWGAGSMBH4ZH6KUT5DPT3UJZOFXMXAN/?format=api", "sender": { "address": "zack.kd8ksn (a) hotmail.com", "mailman_id": null, "emails": null }, "sender_name": "Zachary Beougher", "subject": "[amsat-bb] Re: OSCAR-11 Report", "date": "2010-10-02T22:50:59Z", "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/CBWGAGSMBH4ZH6KUT5DPT3UJZOFXMXAN/?format=api", "children": [ "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/C4YWZNDZ33VVEV6KS4RIUJY362CODNL7/?format=api", "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/FTIJBJLYQWA4GQPOPCA52OFOPZWGIMIZ/?format=api" ], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "Clive,\n\nThank you for sending this out - this may answer something I was wondering \nabout a few weeks ago....\n\nI was out during a morning 1300-1400z HO68 pass about 3-4 weeks ago, and as \nI was doing the pass, I noticed the S-meter on my TRANSMIT HT was peaking at \nabout S7 (I was using one HT to receive the 435.675 downlink, and the other \nfor the 145.825 uplink). I turned the volume up on the transmit HT to see \nwhat it was, and I heard the EXACT same audio that you have on your webpage \nof Oscar-11's telemetry beacon on 145.826 (1 kHz off of the uplink for \nHO68). I am assuming that what I heard on my transmit HT was probably the \nOscar-11 beacon - could anyone confirm that?\n\n73,\n\nZack\nKD8KSN\nEN80sd\n\n--------------------------------------------------\nFrom: \"Clive Wallis\" <[email protected]>\nSent: Saturday, October 02, 2010 11:54 AM\nTo: \"amsat\" <[email protected]>\nSubject: [amsat-bb] OSCAR-11 Report\n\n>\n> OSCAR-11 REPORT 30 September 2010\n>\n>\n> This report covers the period from 30 March to 30 September\n> 2010. During this time the satellite was silent until it was\n> heard by JA0CAW on 29 August. Since then, it was heard until\n> 08 September and from 18 to 29 September. Excellent signals\n> have been reported from stations located around the world,\n> and good copy obtained from decoded telemetry frames.\n>\n> There has been a significant change since the previous\n> period of activity which ended in March 2010. The on-board\n> clock is now very stable. It's gained only three seconds in\n> 30 days. This is comparable with its accuracy when the\n> satellite was fully operational. During its first 21 years\n> it gained approximately one minute per year. However, there\n> is still an accumulated loss of 309 days, which has occurred\n> during eclipses of the last few years.!\n>\n> The other change is that it's now transmitting during\n> eclipses, although signals are weaker at those times. This\n> indicates that there is still some capacity remaining in the\n> battery.\n>\n> These two changes suggest that some part of the system may\n> have recently failed 'open circuit' thus reducing the\n> overall power drain of the system, and allowing more power\n> to be available during eclipses. There was an unexplained\n> current drain observed when analogue telemetry was last\n> transmitted. This fault might have cleared. Interestingly,\n> the status telemetry shows that the Digital Store & Readout\n> experiment has switched off, since the satellite was\n> previously heard in February.\n>\n> The satellite appears to be operating for ten days on,\n> followed by ten days off, so it should start transmitting\n> again around 09 October.\n>\n> The Beacon frequencies are -\n>\n>\n> VHF 145.826 MHz. AFSK FM ASCII Telemetry\n>\n> UHF 435.025 MHz. OFF\n>\n> S-band 2401.5 MHz. OFF\n>\n> Reception reports have been received from Bernard FY1LE,\n> Roland DG1EBR, Mike DK3WN, Tetsu JA0CAW, Adam SQ8MFC,\n> MM0DNX, Tony VK3KKP/G8HIM, Martin DC1MAR, John M0BIC,\n> Etienne F1GRR and Carlos KD6GRF. Many thanks to everyone.\n>\n> Many reports have also been added to the live satellite\n> status page, on the website set up by David KD5QGR and Bob\n> WB4APR. This is a very convenient and easy to use facility,\n> which shows the current status of all the amateur\n> satellites. Strongly recommended for future reports! The\n> URL is http://oscar.dcarr.org/index.php\n>\n> For the benefit of new listeners, here is a short history\n> of OSCAR-11. It was lauched in 1984, providing telemetry\n> and other digital services for amateur radio and educational\n> users. During its many years of operation it survived long\n> periods of eclipses and continuous full sunlight.\n>\n> In 2002 the satellite reverted to its default mode of\n> operation, controlled by the watchdog timer. In 2005 all the\n> analogue telemetry channels failed. Solar eclipses also\n> started to cause the watchdog timer cycle to reset, which\n> switched off the satellite for approximately 15 days.\n>\n> In 2008 solar eclipses became a permanent feature of every\n> orbit, causing the satellite to switch off for about 15\n> days, probably after only one orbit of transmission. Thus\n> the satellite was not expected to be heard again for any\n> continuous period until 2019, when there will be some\n> eclipse free periods. However, the satellite started\n> transmissions unexpectedly in November 2008. These continued\n> until March, when it was followed by silence until until the\n> recent period of activity.\n>\n> OSCAR-11 transmits on 145.826 MHz., set receiver to NBFM.\n> The satellite has a characteristic sound, rather like raspy\n> slow morse code, sending \"di di dah dah dah dah dah dah dah\"\n> sent over a period of five seconds. If you are receiving a\n> very weak signal, switch the receiver to CW or SSB. You\n> should hear several sidebands around the carrier frequency\n> and should be able to hear the characteristic 'morse code\n> like' sound on at least one sideband.\n>\n> Please note that you need a clean noise-free signal to\n> decode the signals, and your receiver must be set to NBFM\n> mode, for a decoder to work.\n>\n> If you need to know what OSCAR-11 sounds like, there is an\n> audio clip on my website www.g3cwv.co.uk/ which may be\n> useful for identification and as a test signal for decoding.\n>\n> The current status of the satellite, is that all the\n> analogue telemetry channels, 0 to 59 are zero, ie they have\n> failed. The status channels 60 to 67 are still working. The\n> real time clock is showing a large accumulated error, but is\n> now incrementing accurately to within a few seconds per\n> month. The day of the month has a bit stuck at 'one' so the\n> day of the month may show an error of +40 days for some\n> dates. The time display has switched into 12 hour mode.\n> Unfortunately, there is no AM/PM indicator, since the time\n> display format was designed for 24 hour mode.\n>\n> The spacecraft computer and active attitude control system\n> have switched OFF, ie. the satellite' attitude is controlled\n> only by the passive gravity boom gradient, and the satellite\n> is free to spin at any speed.\n>\n> The watchdog timer now operates on a 20 day cycle. The\n> ON/OFF times have tended to be very consistent. The average\n> of many observations have shown this to be 20.7 days, ie.\n> 10.3 day s ON followed by 10.4 days OFF.\n>\n> Listeners to OSCAR-11 may be interested in visiting my\n> website. If you need to know what OSCAR-11 should sound\n> like, there is a short audio clip for you to hear. The last\n> telemetry received from the satellite is available for\n> download. The website contains an archive of news &\n> telemetry data which is updated from time to time. It also\n> contains details about using a soundcard or hardware\n> demodulators for data capture. There is software for\n> capturing data, and decoding ASCII telemetry. The URL is\n> www.g3cwv.co.uk .\n>\n> If you place this bulletin on a terrestrial packet network,\n> please use the bulletin identifier $BID:U2RPT149.CWV, to\n> prevent duplication.\n>\n> 73 Clive G3CWV [email protected] (please replace xxxxx by g3cwv)\n>\n>\n>\n>\n>\n> \u001a\n> _______________________________________________\n> Sent via [email protected]. Opinions expressed are those of the author.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n> \n", "attachments": [] }