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OSCAR-11 Report



                  OSCAR-11 REPORT

                  25 September 2005

During the period 14 August to 24 September 2005 the VHF beacon on 145.826
MHz. have been heard from 19 to 29 August, and from 09 to 19 September.
Signal strengths of the beacon which transmits ASCII telemetry, have
varied from very weak to strong.

Once again, I am indebted to Jeff KB2M, who supplied telemetry files, for
the passes in September, during my recent holiday.  Many thanks Jeff.
Thanks also to Dave G1OCN, Thomas HB9SKA, Mineo JE9PEL and Max (White)
2E0RGO for reception reports during this period.

All the analogue telemetry channels, 0 to 59 are zero, ie they have
failed.  The status channels 60 to 67 are still working.

The on-board clock continues to show a very large error.  On 19 September
it was 17.7 days slow, having lost 21.3 days since 30 April. During the
last OFF period it was loosing 0.89 hours per day. This increased to 2.1
hours per day during the ON period, that followed.

The eclipses have now ended, and the satellite should be in continuous
sunlight for the remainder of this year, and well into next year.  This
should help the satellite to continue transmitting, although continuous
sunlight can cause problems due to excessive temperatures.

The watchdog timer appears to be operating on the 20 day cycle, ie.
approximately ten days ON followed by 10 days OFF. It appears to be
uneffected by problems of the on-board clock. If the watchdog timer
continues normal operation the VHF beacon should resume transmissions
around 30 September.

The Beacon frequencies are -

VHF 145.826 MHz.  AFSK FM  ASCII Telemetry

UHF 435.025 MHz.  OFF

S-band 2401.5 MHz. OFF

Listeners to OSCAR-11 may be interested in visiting my website which
contains an archive of news & telemetry data. It also contains details
about using a soundcard or hardware demodulators for data capture.  There
is software for capturing data, and decoding ASCII telemetry.  The URL is
www.users.zetnet.co.uk/clivew/

If you place this bulletin on a terrestrial packet network, please
use the bulletin identifier $BID:U2RPT113.CWV, to prevent duplication.

73 Clive G3CWV   g3cwv@amsat.org
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