[PDF] 3DR RADIO V2 tablet. Follow this guide to install the radios on your plane, copter, or rover. 3DR Radios arrive ready to use. Just mount and connect to view real-time data from your drone. Android adapter cable 6-wire Pixhawk connector cable Micro-USB cable Two 3DR Radios in 915 or 433 mHz Attach the antennas, and use either radio as an air or ground module. Older 3DR radio and APM 2.5? Which pins to which pins Nov 02, 2014A friend gave me an older(?) 3DR radio? Anyway, it has 4 leads/wires coming off the "flying" portion. Can someone take a look at the pic and tell me which of the 6 board connections need wires soldered to them, and to which pins on the APM 2.5 they should go?