[amsat-bb] Re: ARISSat-1 battery eclipse voltage decreasing

2011-08-13 Thread Phil Karn
On 8/11/11 8:46 PM, Gould Smith wrote: Kenneth Ransom, N5VHO has plotted the battery min/max for the last 8 days. We see that the battery voltage is decreasing at a faster rate than expected. Kenneth's graph can be found on the arissat1.org site under FAQ

[amsat-bb] Re: ARISSat-1 battery eclipse voltage decreasing

2011-08-13 Thread Dave Guimont
Disclaimer: what follows is entirely my own personal opinion, not necessarily that of the ARISSat-1 team or anyone else. I might be missing information that would affect my analysis. Ken's plot is extremely valuable. It strongly suggests battery failure, not a negative power budget as Tony,

[amsat-bb] Re: ARISSat-1 battery eclipse voltage decreasing

2011-08-13 Thread Phil Karn
On 8/13/11 6:11 PM, Dave Guimont wrote: How about you designing circuitry/program to charge cells individually rather than the battery. Or has that been tried?? That's a great idea; I wish I thought of it first, but it was Lou McFadden W5DID who published a paper at the AMSAT Symposium a few

[amsat-bb] Re: ARISSat-1 battery eclipse voltage decreasing

2011-08-13 Thread Art McBride
, August 13, 2011 6:11 PM To: Phil Karn Cc: amsat-bb@amsat.org Subject: [amsat-bb] Re: ARISSat-1 battery eclipse voltage decreasing Disclaimer: what follows is entirely my own personal opinion, not necessarily that of the ARISSat-1 team or anyone else. I might be missing information that would affect

[amsat-bb] Re: ARISSat-1 battery eclipse voltage decreasing

2011-08-12 Thread PA3GUO
Dear Gould / ARISSat-1 team, Thanks for sharing this ! When the battery would go dead (or has very long charge times), to what extend would that also impact the low power mode ? Better phrazed: what are the requirements to go/stay in low power mode ? Is there a (no power) mode, where there