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www.southgatearc.org
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OSCAR-11 Report 16 July 2007I have now updated
the telemetry archive on my website to include all the telemetry received
in 2007. The news archive has also been updated. During the period 15 June to 15 July 2007, no signals have been received
from the satellite's 145.826 MHz. beacon. The satellite is currently subject to solar eclipses, which will continue until 20 August. The duration of the eclipses is now decreasing and will reach a time of 10 minutes, around 10 August. At that level the satellite may be able to sustain continuous operation, however it is not possible to predict when the satellite will switch ON. If there was failed attempt to switch ON just before 10 August, then it could be the end of August before the satellite resumed continuous transmissions. The battery can no longer power the satellite during the eclipse season. When the battery voltage decreases to a preset level, the watchdog timer resets, and the beacon is turned off for approximately 21 days. When the satellite restarts, eclipses could cause the beacon to switch OFF, after a short time, probably less than one orbit. This short transmission could occur any where over the world, and could be repeated at 20.7 day intervals. Owing to the lack of accurate timings, it is impossible to predict when and where the satellite will be heard during these short transmission periods. It is just possible that someone tuning around 145.826 MHz. may hear the satellite, by chance. The Beacon frequencies are - Listeners to OSCAR-11 may be interested in visiting my website. The current monthly bulletin contains further details of the satellite's status. If you need to know what OSCAR-11 should sound like, there is a short audio clip for you to hear. The website contains an archive of news & telemetry data.
73 Clive G3CWV
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