[amsat-bb] Re: ARISSat-1 voice telemetry 00:27z 8/21/11

[Anthony Monteiro]

Hi Greg,

The battery current is not really negative
under these conditions. This is just a small
drift in the zero point of the measurement.

73,
Tony AA2TX
---

On 8/20/2011 8:42 PM, Greg D. wrote:
>
> Hii all,
>
> ARISSAt-1 voice telemetry just now:
>
> 00:27z 8/21/2011 received at CM98
>
> MET 42 min
> IHU Temp = +30c
>
> Control panel temp = +20c
>
> Battery 3??? (lost to QSB)
>
> Battery current ??? ma
>
> SSTV picture followed (a real one this time, not pre-recorded!), then off.
>
> 00:29z 8/21/2011 received at CM98
>
> MET = 45 min
> IHU Temp = +31c
> Control panel temp = +20c
> Battery 35.66v
> Battery current -8ma
>
> This was followed by 2 min off, and another voice announcement, children chanting, and then off again to LOS.
>
>
> So, a question...  Why, when the spacecraft is in full sun, is the battery current negative?  I'm guessing that there some orientations that will not supply sufficient power for operations.  If so, what happens when we lose the battery altogether?  Reset?  Or is there a shedding of load first when the voltage drops?
>
> Greg  KO6TH
>
>   		 	   		
> _______________________________________________
> Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
>