Oscar-11, or UO-11, has been in orbit for 21 years. It is still operating and sending useful telemetry data. VHF The lighthouse. Congratulations are due in particular to Professor Sir Martin Sweeting G3YJO and his team for a job well done.
Signals from the beacon on 145.826 MHz were detected between February 15 and March 9, 2005. ASCII telemetry strings were decoded between February 25 and March 9, with signals weaker and QRNs larger than usual.
The beacon is controlled by a watchdog, and observations show that it is on for an average of 10.3 days and off for 10.4 days. Based on these observations, the beacon should be activated next on March 17th.
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The internal temperature has decreased by approximately five degrees Celsius. It is now 14°C on the battery, 13°C on the telemetry block and 20°C on the control decoder. The satellite is currently fully illuminated by the Sun and therefore these temperature differences. The irradiated, i.e. warmer surface of the satellite also affects some parts inside. Based on predictions, this state will be around the end of April.
The battery voltage ranged from 11.7 to 13.7V. The average was 12.4V, unchanged from the last report. The voltage will decrease as the temperature inside the satellite decreases.
Those who have already decoded the signals from UO-11 know that the date shift in it has increased to four days and the clock deviation is 20.6 minutes, and this error is increasing by approximately one minute per year.
UO-11 is now operating in a basic watchdog-controlled mode. The satellite transmits ASCII telemetry continuously for approximately 10.3 days on 145.826MHz, followed by 10.4 days of silence. However, this can be affected by the control center on Earth at any time.
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Currently, the Mode S beacon on 2401.5 MHz and the VHF beacon on 453.025 MHz are turned off.
More detailed information on how to decode telemetry via a sound card and details regarding HW demodulators, audio recordings can be found on the page www.users.zetnet.co.uk/clivew/.
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