[aprssig] balloon tracker
rrochte at gpacademy.org
Wed Mar 2 14:31:40 CST 2005
>Energizer e^2 lithium AA. Spec sheet says good to -40C
I've had bad luck with them on my last two flights... I don't have any hard
data, but they really must drop off below about -20C.
>For this reason as well as size and weight, I need to do a DC-DC
>converter and just drive the rig from two or three of these.
That's my solution - a DC-DC converter, but powered by one of my LiSO2
batteries. I wouldn't trust another flight to the consumer-grade lithium
(I should say, I *would* use them for a daytime-only flight, but my solar
balloons are usually in the air for at least 2-3 hours after sundown...
During the day, just use the solar heating to keep your payload warm.)
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