Description
3DR official instructions for use:
https://code.google.com/p/arducopter/wiki/APM13DRadio?wl=en
Data transmission special setting tool:
http://vps.oborne.me/3drradioconfig.zip
Official PCB and schematic diagram:
http://stuff.storediydrones.com/3DR-Radio.zip
http://stuff.storediydrones.com/3DR-Radio-USB.zip