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

Mark L. Hammond marklhammond at gmail.com
Fri Dec 4 15:44:39 UTC 2020

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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 > _______________________________________________ > Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum..


Andrew Glasbrenner glasbrenner at mindspring.com
Fri Dec 4 15:46:35 UTC 2020

It’s auto safe mode from hitting minimum battery voltage. There’s not much to be done about it unfortunately. Sent from my iPhone > On Dec 4, 2020, at 10:41 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 > _______________________________________________ > Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available > to all interested persons worldwide 

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AO-91/92 update
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month 
 Andrew Glasbrenner
6 Янв 2021 11:57
Today I turned AO-92's transmitter off after resetting the min-max readings.
We've been watching the battery minimum voltage decline steadily over the
last few days, and needed to give it a rest for a bit.

 

Immediately afterwards, there was an AO-91 pass. I turned on the
transmitter, and a few moments later reset the min-max readings. The command
team will monitor telemetry and determine if we can leave it on for a while.

 

Please remember to not transmit to either satellite while it is in eclipse.
If you do not use software that indicates eclipse state, just avoid the
evening passes. We are in the endgame for both satellites, and your
cooperation will give us more operational time over the coming months.

 

Thanks and 73,

Drew Glasbrenner, KO4MA

AMSAT VP Operations




    
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Andrew Glasbrenner
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