Oscar-11, or UO-11, has been in orbit for 21 years. It is still working and sending useful telemetry data VHF a lighthouse. Congratulations are due especially to Professor Sir Martin Sweeting G3YJO and his team for a job well done.
In the period from February 15 to March 9, 2005, signals from the lighthouse were captured at a frequency of 145.826 MHz. From February 25th to March 9th ASCII strings of telemetry were decoded, while signals were weaker and QRNs larger than usual.
The lighthouse is managed by a watchdog, with observations saying that it is on average 10.3 days on and 10.4 days off. Based on these observations, the lighthouse should be activated next on March 17.
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The internal temperature dropped by about five degrees Celsius. It is now 14°C on the battery, 13°C on the telemetry block and 20°C on the control decoder. Currently, the satellite is fully illuminated by the Sun, and therefore these temperature differences. The irradiated, i.e. warmer, surface of the satellite has an effect on some parts inside as well. Based on predictions, it is assumed that this state will be around until the end of April.
The battery voltage ranged from 11.7 to 13.7V. It averaged 12.4V, which is unchanged since the last report. The voltage will decrease as the temperature in 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 increases by about one minute per year.
UO-11 now works in watchdog controlled basic mode. The satellite transmits ASCII telemetry continuously for approximately 10.3 days at 145.826MHz followed by 10.4 days of silence. However, this can affect 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 through a sound card and details about HW demodulators, audio recordings can be found on www. users .zetnet.co.uk/clivew/.
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