3D Robotics Video/OSD Kit - Manual (Page 5)

Wire onboard components: Pixhawk and 3DR Radio V2 Wire and mount transmitter battery
Connect the red and black two-wire cable to the transmitter. When you are ready to
power your video system, attach a battery to the red connector. Mount the battery to
your vehicle in a secure location.
Wire and power receiver
Attach an antenna to the receiver. Connect the AV output cable to either receiver
AV OUT port. Connect the RC power cable to the receiver DC IN port, and attach
a battery to the red connector.
Please note that the AV output cable is a custom cable assembly and must be
purchased from 3D Robotics.