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If you are doing it in the backyard, I would suggest buying a laboratory power supply- from $69.95-$199 at Jaycar. I bought one from Dick Smith a few years back, but I can't find it on their site now. It plugs into the mains and produces 13.8v regulated DC, which is good for the G11. So get a looong extension cord and a power board. Computer and lab power supply run off the power board, other stuff (scope, dew heaters) off the DC supply.
I only use batteries when there is no nearby AC.
Geoff
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