ARLA/CLUSTER: Não Use o AO-51 quando está no Eclipse.

[João Gonçalves Costa]

[http://www.amsat.org/amsat-new/echo/images/AO-51_Doppler.gif][http://www.onlineradio.fr/wp-content/uploads/2009/07/AO-51.jpg]
Please Do Not use AO-51 while the satellite is in eclipse

After a brief outage on May 16, the AO-51 Command Team has turned the AO-51 repeater back on, including the 67 Hz PL mode.

The Command Team has a favor to ask of our Southern Hemisphere users, including those in South America, Southern Africa, Australia, and New Zealand:

Please avoid using AO-51 while the satellite is eclipsed.

Most tracking programs indicate illuminated or eclipsed states, and it can always be found by whether the footprint of the satellite is crossing or in contact with the footprint of the sun. Generally this is occurring when the satellite is South of 30 degrees South latitude at present. AO-51 eclipses are predicted to reach almost 20 minutes by July 2010.

AMSAT-NA VP of Operations, Drew Glasbrenner, KO4MA said, "I realize this is a large favor to ask, but the alternative right now is moving to a scheduled type operation, which I would like to avoid. Please pass this to your friends, other users you know, and your national satellite email lists and forums."

For this summer eclipse season, the eclipsed periods are while AO-51 is over mostly unoccupied Antarctica and surrounding areas. This means when the batteries alone are supporting the transmitter there are not likely to be any users. The power management software combined with the PL, should mean the satellite's batteries can be protected from over-discharge, while still providing the strongest possible downlink signal and highest possible availability.

Observations from the southern hemisphere while entering and leaving eclipse are very helpful. Post your reports on the AMSAT-BB or e-mail your report to the AO-51 Control Team via ao51-modes  amsat.org<mailto:ao51-modes  amsat.org>.

AO-51 operators also monitor the Live OSCAR Satellite Status page (http://oscar.dcarr.org/). Analysis of AO-51's Whole Orbit Data (WOD) files shows the distribution of the satellite's users. See: http://tinyurl.com/2ehbxv5

If the eclipse periods get too long too fast the repeater may shut off due to a low battery voltage watchdog. If this happens, please email Drew directly via ko4ma  amsat.org<mailto:ko4ma  amsat.org>.

Read the latest AO-51 Control Team News at:
http://www.amsat.org/amsat-new/echo/CTNews.php



Drew, KO4MA
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