Looks like FWD power commanded down 1045u 5/15/20
Hi all,
Last night, Drew did some commanding. The bird had been going in and out of SAFE mode, so he sent several commands. I'll let him cover, but basically power to -18 and EPS to ON, as I recall. He also commanded it into HEALTH mode a time or two, but it would return to SAFE. At the send of the pass, it was in SAFE mode, and FWD power was still showing at 325mW.
A quick check of the telemetry data on the web this morning showed it was in HEALTH mode, FWD power at 325mW.
So about 1045utc 15 May 20, I sent some commands to try and set the power to -19, and by golly it heard me and the power dropped to about 124mW. So, at my LOS still in HEALTH mode, power showing 125mW. We'll see where it goes from here, but that has to be better on the power budget I'd think. PA cuirrent went down also, from like 225 mA to 125 mA. So that makes sense to me...
73,
FYI, commanding out of safe mode if it is in there because of the low voltage will only work if it is in the middle of the voltage hysteresis curve. In other words it goes into autosafe if the voltage drops below x. It comes back out of the voltage is above y (where y is greater than x). If it is below x and you command it out of safe mode, it will go right back in. If it is between x and y, it will stay out of safe mode until the voltage drops below x again. This is identical to the behavior that the FM Foxes had.
Like Fox, you can disable autosafe. On HuskySat, it is also possible to adjust the trigger voltage, but the default was chosen by UW as the minimum voltage that they wanted the batteries ever reach in order to avoid damage. It's probably worth trying to figure out what is going on first.
Suggestion: Command "Reset MinMax Distrib", "Reset MinMax Gen" and "Reset MinMax Batt" to get some better idea what is going on with the power. Nathan has checked these commands for correctness and insists that they have no side effects, just as clear min/max does not on the Foxes.
73,
Burns Fisher, WB1FJ *AMSAT(R) Flight Software*
On Fri, May 15, 2020 at 7:03 AM Mark Hammond via LTM ltm@amsat.org wrote:
Hi all,
Last night, Drew did some commanding. The bird had been going in and out of SAFE mode, so he sent several commands. I'll let him cover, but basically power to -18 and EPS to ON, as I recall. He also commanded it into HEALTH mode a time or two, but it would return to SAFE. At the send of the pass, it was in SAFE mode, and FWD power was still showing at 325mW.
A quick check of the telemetry data on the web this morning showed it was in HEALTH mode, FWD power at 325mW.
So about 1045utc 15 May 20, I sent some commands to try and set the power to -19, and by golly it heard me and the power dropped to about 124mW. So, at my LOS still in HEALTH mode, power showing 125mW. We'll see where it goes from here, but that has to be better on the power budget I'd think. PA cuirrent went down also, from like 225 mA to 125 mA. So that makes sense to me...
73,
-- Mark L. Hammond [N8MH]
LTM mailing list LTM@amsat.org https://www.amsat.org/mailman/listinfo/ltm
participants (2)
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Burns Fisher (AMSAT) -
Mark Hammond