[amsat-bb] AO-91 flipped to Safe Mode for the third night

[Burns Fisher]

The temps around 1513UTC 4Dec2020 are all in the vicinity of 25.5 C (A is a
bit higher, C is a bit lower).  Cell A is about 1V, while B and C are about
1.3.  I recognize that the calibration may not be perfect (does 25.5 really
mean 23 or 27?) but they are in the ballpark, and differences may be more
significant.

This bird does not tell its safe mode state as frequently as later ones, so
I don't see that it was in auto-safe mode, but the voltage is close to
where it would tick over, so that makes sense.

On Fri, Dec 4, 2020 at 4:13 PM Jerry Buxton via AMSAT-BB <amsat-bb at amsat.org>
wrote:

> Did anyone happen to check BATT Temperature for/around that time?
>
> Jerry Buxton, NØJY
>
> On 12/4/2020 09:44, Mark L. Hammond via AMSAT-BB wrote:
> > Hello Yono,
> >
> > Thanks for this information.  One the battery voltage gets down to about
> > 3.6V (think that's the value...), AO-91 will go automatically into safe
> > mode.  The values of "MIN" in the telemetry logs will help to tell a more
> > complete picture.  It's reporting as low as 3.31V now.    So yes, it's
> > behaving as designed and engineered!
> >
> > 73,
> >
> > Mark L. Hammond [N8MH]
> > AMSAT Director and Command Station
> >
> >
> >
> > On Fri, Dec 4, 2020 at 10:40 AM Yono Adisoemarta via AMSAT-BB <
> > amsat-bb at amsat.org> wrote:
> >
> >> Dear all,
> >>
> >> For the third evening, AO-91 satellite flipped to Safe Mode during the
> 10
> >> PM (15 UTC) pass over Indonesia, before reaching TCA.
> >>
> >> Reading the telemetry, battery voltages are ok. Anything else that
> tripped
> >> the sat into Safe Mode?
> >>
> >> 73 de Yono - YD0NXX
> >>
> >>
> >> Sent from my iPhone
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> _______________________________________________
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> to all interested persons worldwide without requiring membership. Opinions
> expressed
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