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

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