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 [email protected] 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 [email protected] 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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