[amsat-bb] OSCAR-11 Annual Report 2012

Clive Wallis clive at g3cwv.co.uk
Sat Feb 2 07:47:17 PST 2013

                OSCAR-11 ANNUAL REPORT  2012

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

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 .

If you place this bulletin on a terrestrial packet network,
please use the bulletin identifier $BID:U2RPT158.CWV, to
prevent duplication.

73 Clive G3CWV xxxxx at amsat.org (please replace the x's by

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