so just what would that anomaly be?? if known just courious, Rodney kc0zhf Message: 4 Date: Sat, 06 Nov 2010 09:32:25 -0400 From: "Mark L. Hammond" marklhammond@gmail.com Subject: [amsat-bb] AO-51 reloaded and operational To: amsat-bb@amsat.org Cc: ao51-modes@amsat.org Message-ID: TpYk1f00956cfur05pYndA@gmail.com Content-Type: text/plain; charset="us-ascii"
Hi All,
Thanks to a great team effort, we have the AO-51 repeater back up and operational.
It will be several more hours before the PBBS is open for public access, but we expect it will be open around 2100utc today.
We usually get asked, "What caused the crash?" We honestly don't know. It is unlikely to be related to the power budget; it would have just turned a transmitter OFF in that case. We often suspect the South Atlantic Anomaly as the cause, and based on the time frame of the crash this time, it is a plausible hypothesis.
On behalf of the AO-51 Command Team,
Mark L. Hammond [N8MH]
Basically, it's an area of increased radiation. You can find lots of info on the web. For example, at http://en.wikipedia.org/wiki/South_Atlantic_Anomaly .
-- Dave, W8AAS
On Nov 6, 2010, at 3:55 PM, Rodney Waln wrote:
so just what would that anomaly be?? if known just courious, Rodney kc0zhf
Message: 4 Date: Sat, 06 Nov 2010 09:32:25 -0400 From: "Mark L. Hammond" marklhammond@gmail.com Subject: [amsat-bb] AO-51 reloaded and operational To: amsat-bb@amsat.org Cc: ao51-modes@amsat.org Message-ID: TpYk1f00956cfur05pYndA@gmail.com Content-Type: text/plain; charset="us-ascii"
Hi All,
Thanks to a great team effort, we have the AO-51 repeater back up and operational.
It will be several more hours before the PBBS is open for public access, but we expect it will be open around 2100utc today.
We usually get asked, "What caused the crash?" We honestly don't know. It is unlikely to be related to the power budget; it would have just turned a transmitter OFF in that case. We often suspect the South Atlantic Anomaly as the cause, and based on the time frame of the crash this time, it is a plausible hypothesis.
On behalf of the AO-51 Command Team,
Mark L. Hammond [N8MH]
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
The "dimple" in the magnetic field also has control consequences for spacecraft which use active magnetic torquing. The HST had to account for it when planning pointing shifts, especially during long duration exposures.
Alan WA4SCA
participants (3)
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Alan P. Biddle -
Dave Taylor -
Rodney Waln