[amsat-bb] EO-79

David G0MRF g0mrf at aol.com
Thu Mar 23 16:53:18 UTC 2017

Hi Ken.   You are correct.

Exits eclipse into sunlight with transponder off.
counts 27 minutes -This is over Antarctica and the southern Ocean, so not many users. - Battery charging.
Switches on transponder.
After 25 minutes of transponder operation it switches off.
Then it has a short period in sunlight to add a little charge to the battery
Enters next eclipse.

Since implementing this schedule it has not been modified.
We continue to monitor the orbit / the coverage area of the satellite and the power budget as the seasons change.

So far.....so good.


David  G0MRF




-----Original Message-----
From: Ken Alexander <k.alexander at rogers.com>
To: amsat-bb <amsat-bb at amsat.org>
Sent: Thu, 23 Mar 2017 16:38
Subject: [amsat-bb] EO-79

Just reading up on EO-79, trying to understand it.  The Amsat website 
says:  "The transponder will commence operation 27 minutes after the 
spacecraft enters sunlight and will stay on for a period of 25 minutes."

I take that to mean that the transponder will stay ON for 25 minutes 
regardless of whether the satellite is in sunlight or darkness during 
that 25 minute period.  Is that correct?

I also read:  "This schedule may be modified over the forthcoming weeks 
as a result of experience."

Have there been any changes to the schedule?

73 and many thanks in advance!

Ken Alexander

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