The apo3 schematic is here: http://www.aprsworld.com/apo3/apo3_schematic.pdf and his bom is APO3 technical information - APRS World, LLC
my understanding of that schematic is he has his pic controlling 1 transistor http://www.digikey.com/scripts/DkSearch/dksus.dll?PName?Name=568-1369-1-ND and 1 relay http://www.digikey.com/scripts/DkSearch/dksus.dll?PName?Name=Z208-ND
Which is exactly what I'm trying to do? Although I don't understand the point of R6 on his diagram, 10k resistor? And you have a resistor in your diagrams as well David, is that to prevent the Arduino from overpowering the transistor?