3DR 915MHz 500mW Radio Telemetry Module

Telemetry needs its own dedicated radio link separate from RC control and video, carrying live flight data (battery, GPS, altitude, status flags) back to a ground station running software like Mission Planner or QGroundControl. This 915MHz pair handles that specifically for the ISM band used in regions where 915MHz is the standard telemetry frequency, delivering 500mW of output power for a genuine 2km range under normal conditions rather than a marginal best-case figure.

A standard TTL UART interface keeps wiring straightforward on the air-side module connecting to the flight controller, and -117dBm receiver sensitivity gives real margin for maintaining a stable link as distance increases rather than cutting out abruptly. Bidirectional communication with integrated error correction means the ground station can also send commands back up to the aircraft, not just passively receive data.

Common uses are long-range autonomous and semi-autonomous flights needing live telemetry monitoring from a ground station, PX4/APM/Pixhawk-based fixed-wing and multirotor builds already using MAVLink, and any open-source autopilot project needing a reliable dedicated telemetry link separate from RC and video channels.