AO-91 flipped to Safe Mode for the third night
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
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 < [email protected]> 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 [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
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 < [email protected]> 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 [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
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 [email protected] 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 < [email protected]> 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 [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership.
Opinions
expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite
program!
Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership.
Opinions expressed
are solely those of the author, and do not reflect the official views of
AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite
program!
Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
participants (4)
-
Burns Fisher -
Jerry Buxton -
Mark L. Hammond -
Yono Adisoemarta