Radio Modem for data transmission
The radio modem transmits and receives data from a computer on the ground. Flight plan and high level commands are sent to the airplane (but the control and navigation are done onboard) and at the opposite, telemetry containing gps position, speed, altitude, etc. is sent to the ground computer. Thus, the behaviour of the airplane can be shown in real-time on the screen of the computer and all flight can be recorded for further analysis.
Scheme of the module:
MaxStream Radio Modem