Today (8/24) at ~4:16 UTC I was attempting to uplink to AO-92 when Veronica announced “FOX-1 Delta, Safe Mode”. Does anyone know what put AO-92 in safe mode, and will this happen every night?
KE0NEV
Hi John, AO-92 has been experiencing low battery voltage during many night time passes over the last several weeks. While the satellite is in eclipse voltage has been dropping low enough (3.6v IIRC) to cause an automatic shift to safe mode. It emerges from eclipse toward the end of night passes over North America and the transponder will then switch on, usually with a minute or two remaining in the pass. At this time as far as I know there is not any way to prevent this as it appears to be due to a failing battery situation. NateN5LEX
On Monday, August 24, 2020, 1:28 AM, John E. Amdor IV via AMSAT-BB [email protected] wrote:
Today (8/24) at ~4:16 UTC I was attempting to uplink to AO-92 when Veronica announced “FOX-1 Delta, Safe Mode”. Does anyone know what put AO-92 in safe mode, and will this happen every night?
KE0NEV _______________________________________________ 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
From my very limited knowledge, the batteries are dropping to a voltage
during eclipse that safe mode is triggered to prevent the batteries from discharging too far and thus preventing damage. Once the satellite is back into illumination it should return to normal operations once the batteries have charged.
AGAIN, this is MY understanding of the situation, and in no way reflects an officatial AMSAT response nor might be accurate.
On Mon, Aug 24, 2020 at 2:35 AM John E. Amdor IV via AMSAT-BB < [email protected]> wrote:
Today (8/24) at ~4:16 UTC I was attempting to uplink to AO-92 when Veronica announced “FOX-1 Delta, Safe Mode”. Does anyone know what put AO-92 in safe mode, and will this happen every night?
KE0NEV _______________________________________________ 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
Hi Don,
All correct, except auto safe mode ends as soon as eclipse does, when the bus voltage goes over 3.6. The batteries will charge then for the next 60 minutes or so until the next eclipse.
As we move to winter in the northern hemisphere, the end of the eclipse should shift over the pole and to the beginning of the descending part of the orbit, and this issue should change for at least the northern hemisphere ops.
73, Drew KO4MA AMSAT VP Operations
-----Original Message----- From: AMSAT-BB [email protected] On Behalf Of Don KB2YSI via AMSAT-BB Sent: Monday, August 24, 2020 8:36 AM To: John E. Amdor IV [email protected] Cc: AMSAT BB [email protected] Subject: Re: [amsat-bb] FOX-1D (AO-92) in safe mode
From my very limited knowledge, the batteries are dropping to a voltage during eclipse that safe mode is triggered to prevent the batteries from discharging too far and thus preventing damage. Once the satellite is back into illumination it should return to normal operations once the batteries have charged.
AGAIN, this is MY understanding of the situation, and in no way reflects an officatial AMSAT response nor might be accurate.
On Mon, Aug 24, 2020 at 2:35 AM John E. Amdor IV via AMSAT-BB < [email protected]> wrote:
Today (8/24) at ~4:16 UTC I was attempting to uplink to AO-92 when Veronica announced “FOX-1 Delta, Safe Mode”. Does anyone know what put AO-92 in safe mode, and will this happen every night?
KE0NEV _______________________________________________ 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
-- 73, Don KB2YSI https://www.hamqth.com/kb2ysi _______________________________________________ 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
Thanks Drew!
On Mon, Aug 24, 2020, 09:32 Andrew Glasbrenner [email protected] wrote:
Hi Don,
All correct, except auto safe mode ends as soon as eclipse does, when the bus voltage goes over 3.6. The batteries will charge then for the next 60 minutes or so until the next eclipse.
As we move to winter in the northern hemisphere, the end of the eclipse should shift over the pole and to the beginning of the descending part of the orbit, and this issue should change for at least the northern hemisphere ops.
73, Drew KO4MA AMSAT VP Operations
-----Original Message----- From: AMSAT-BB [email protected] On Behalf Of Don KB2YSI via AMSAT-BB Sent: Monday, August 24, 2020 8:36 AM To: John E. Amdor IV [email protected] Cc: AMSAT BB [email protected] Subject: Re: [amsat-bb] FOX-1D (AO-92) in safe mode
From my very limited knowledge, the batteries are dropping to a voltage during eclipse that safe mode is triggered to prevent the batteries from discharging too far and thus preventing damage. Once the satellite is back into illumination it should return to normal operations once the batteries have charged.
AGAIN, this is MY understanding of the situation, and in no way reflects an officatial AMSAT response nor might be accurate.
On Mon, Aug 24, 2020 at 2:35 AM John E. Amdor IV via AMSAT-BB < [email protected]> wrote:
Today (8/24) at ~4:16 UTC I was attempting to uplink to AO-92 when Veronica announced “FOX-1 Delta, Safe Mode”. Does anyone know what put AO-92 in safe mode, and will this happen every night?
KE0NEV _______________________________________________ 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
-- 73, Don KB2YSI https://www.hamqth.com/kb2ysi _______________________________________________ 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)
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Andrew Glasbrenner -
Don KB2YSI -
John E. Amdor IV -
nathanjwhite