This report covers the period from 01 January 2012 to 01 January 2013. During this time there have been no significant changes apart from the gradual drift of the on-board clock. The satellite has been transmitting on a regular cycle of 10.35 days on followed by 10.35 days off.
OSCAR-11 (AKA UoSAT-2 and UO-11) celebrated it’s 28th birthday in space on 01 March! It was designed, built and launched within a period of six months, using commercially available ‘off the shelf’ components (COTS). Once again, congratulations to Professor Sir Martin Sweeting G3YJO, his team at the University of Surrey and the groups of radio amateurs who also contributed to the project.
Good copy has been obtained obtained from decoded telemetry frames and many reports have been posted on the DCARR general satellite status website,
The satellite continues to be subjected to eclipses during each orbit, resulting in weaker signals at those times. During the summer in the UK all passes were in sunlight, however the eclipses gradually returned during the autumn and now all evening passes are eclipsed and signals are significantly weaker than in the morning passes.
The on-board clock gained 85 seconds during the year, which is comparable with the 60 seconds gain per year when the satellite was launched. There is however a large accumulated error of 308.54204 days slow. This was caused mainly by the clock stopping during eclipses, when there was also an unknown drain on the power supply. The units of the least significant digit correspond approximately to seconds (0.86 seconds actually).
At the present time, while OSCAR-11 is operating in a predictable way, please DO NOT send reports or files by e-mail. However, could all listeners continue to enter their reports on the general satellite status website. This is a very convenient and easy to use facility, which shows the current status of all the amateur satellites, and is of use to everyone. Reports around the expected times of switch-on and switch-off are of special interest, especially for times 13:00 to 18:00 and 22:00 to 08:00 UTC, to when the satellite is out-of-range in the UK . The URL is http://oscar.dcarr.org/index.php
The VHF beacon frequency is 145.826 MHz. AFSK FM ASCII Telemetry. The satellite is operating in the default mode, controlled by the watchdog timer, with a cycle time of 20.7 days. 10.35 days on followed by 10.35 days off.
An extended version of this report is available on my website, and new listeners to OSCAR-11 should read this for further information. The URL is www.g3cwv.co.uk/oscar11.htm . This page contains links to the report, a short audio clip to help you identify the satellite and a file of recent telemetry received. The website also contains an archive of news & telemetry data which is updated from time to time, and details about using a soundcard or hardware demodulators for data capture. There is also software for capturing data, and decoding ASCII telemetry.
The easiest way to check whether OSCAR-11 is operational is to look at the General Satellite Status website http://oscar.dcarr.org/index.php .
73 Clive G3CWV