I am creating a GPS datalogger following this circuit, but I have a standalone GPS board and a 5v lithium battery from a backup GameBoy charger. Question is: can I power both the GPS (with active antenna) and the PIC circuit with the same source? Would I need some sort of filtering capacitor? Another question: I have an active antenna that I took out of the housing and would like to cut down to about a foot in length. Do you think I could take the SMB connector off of the GPS board and just solder the antenna cable directly to the board? I can provide pictures if needed... thanks in advance!