I notice the S#0056mm orbit counter is at 56. The "mm" are minutes into the present orbit. And at 14 orbits per day that means the system reset 4 days ago on the 18th.
No big deal, but Come to think abouit it, I have not seen orbit numbers get very high.and never past S#01XXmm I dont think. Its been 26 days and it should have gotten up to 360 or so by now (though we did send a few reset commands ourselves early on..
Bob, WB4APR
Bob, you obviously don't expect many resets, unlike the AMSAT Fox satellites which we expect to reset every few days. Do you have any rad-tolerant hardware or did you do anything else to reduce resets to the point where they are unexpected?
73,
Burns WB1FJ
On Sat, May 22, 2021 at 2:31 PM Robert Bruninga bruninga@usna.edu wrote:
I notice the S#0056mm orbit counter is at 56. The "mm" are minutes into the present orbit. And at 14 orbits per day that means the system reset 4 days ago on the 18th.
No big deal, but Come to think abouit it, I have not seen orbit numbers get very high.and never past S#01XXmm I dont think. Its been 26 days and it should have gotten up to 360 or so by now (though we did send a few reset commands ourselves early on..
Bob, WB4APR
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Regarding PSAT2 recovery modes:
PSAT2 is all off-the-shelf stuff in sockets and nothing special other than tantalum caps vs electrolytics. If the systems latch up, we have multiple CPU reset capabilities:
DTMF CPU can be reset via SATT4 packet command DTMF CPU has 6 day timer to reset SATT4 and DTMF. ADCS CPU can be reset via SATT4 packet command ADCS CPU 6 day timer re-tries-BURN (antenna release) in RUN 0. Use CLEAR command SATT4 will reset by 555 timer if no TLM every 2 minutes or less SATT4 will be reset via 6 DAY timeout in DTMF CPU if not cleared SATT4 can be forced to RESET by forcing 6day reset with DTMF Firecode PSK31 will reset by 555 timer if no heartbeat once a minute. PSK31 can be reset via SATT4 packet command keeping power off of it Any Transmitter lockup will deplete batteries and cause a full power cycle reset
In otherwords, I like to have multiple ways to reset any CPU on boaord On Sat, May 22, 2021 at 5:35 PM Burns Fisher wb1fj-bb@fisher.cc wrote:
Bob, you obviously don't expect many resets, unlike the AMSAT Fox satellites which we expect to reset every few days. Do you have any rad-tolerant hardware or did you do anything else to reduce resets to the point where they are unexpected?
73,
Burns WB1FJ
On Sat, May 22, 2021 at 2:31 PM Robert Bruninga bruninga@usna.edu wrote:
I notice the S#0056mm orbit counter is at 56. The "mm" are minutes into the present orbit. And at 14 orbits per day that means the system reset 4 days ago on the 18th.
No big deal, but Come to think abouit it, I have not seen orbit numbers get very high.and never past S#01XXmm I dont think. Its been 26 days and it should have gotten up to 360 or so by now (though we did send a few reset commands ourselves early on..
Bob, WB4APR
Sent via AMSAT-BB(a)amsat.org. 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. Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/
View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/amsat-bb@amsat.org To unsubscribe send an email to amsat-bb-leave(a)amsat.org Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org
Hello Burns. That's an interesting statistic. With AO-73 etc we've come to expect a reset/crash around once every 6-9 months.Until recently we've not lost a processor. However looking at reports of JO-97, there is some unexplained behaviour which could be a processor fault. - That would explain the lack of telemetry.The telemetry stopped mid pass over Brazil, so maybe South Atlantic anomaly related.....or maybe not? 73 David G0MRF
-----Original Message----- From: Burns Fisher wb1fj-bb@fisher.cc To: Robert Bruninga bruninga@usna.edu Cc: amsat bb amsat-bb@amsat.org Sent: Sat, May 22, 2021 10:35 pm Subject: [AMSAT-BB] Re: PSAT2 unknown resets?
Bob, you obviously don't expect many resets, unlike the AMSAT Fox satellites which we expect to reset every few days. Do you have any rad-tolerant hardware or did you do anything else to reduce resets to the point where they are unexpected? 73, Burns WB1FJ On Sat, May 22, 2021 at 2:31 PM Robert Bruninga bruninga@usna.edu wrote:
I notice the S#0056mm orbit counter is at 56. The "mm" are minutes into the present orbit. And at 14 orbits per day that means the system reset 4 days ago on the 18th.
No big deal, but Come to think abouit it, I have not seen orbit numbers get very high.and never past S#01XXmm I dont think. Its been 26 days and it should have gotten up to 360 or so by now (though we did send a few reset commands ourselves early on..
Bob, WB4APR
Interesting. You can look at the reset times on the publicly available FoxTelem data and backtrack the orbit to see that a large number of our resets are also over the SAA.
On Sun, May 23, 2021 at 7:11 AM David G0MRF g0mrf@aol.com wrote:
Hello Burns.
That's an interesting statistic. With AO-73 etc we've come to expect a reset/crash around once every 6-9 months. Until recently we've not lost a processor. However looking at reports of JO-97, there is some unexplained behaviour which could be a processor fault. - That would explain the lack of telemetry. The telemetry stopped mid pass over Brazil, so maybe South Atlantic anomaly related.....or maybe not?
73
David G0MRF
-----Original Message----- From: Burns Fisher wb1fj-bb@fisher.cc To: Robert Bruninga bruninga@usna.edu Cc: amsat bb amsat-bb@amsat.org Sent: Sat, May 22, 2021 10:35 pm Subject: [AMSAT-BB] Re: PSAT2 unknown resets?
Bob, you obviously don't expect many resets, unlike the AMSAT Fox satellites which we expect to reset every few days. Do you have any rad-tolerant hardware or did you do anything else to reduce resets to the point where they are unexpected?
73,
Burns WB1FJ
On Sat, May 22, 2021 at 2:31 PM Robert Bruninga bruninga@usna.edu wrote:
I notice the S#0056mm orbit counter is at 56. The "mm" are minutes into the present orbit. And at 14 orbits per day that means the system reset 4 days ago on the 18th.
No big deal, but Come to think abouit it, I have not seen orbit numbers get very high.and never past S#01XXmm I dont think. Its been 26 days and it should have gotten up to 360 or so by now (though we did send a few reset commands ourselves early on..
Bob, WB4APR
participants (3)
-
Burns Fisher -
David G0MRF -
Robert Bruninga