The 3DR Radio telemetry system is designed as an open source Xbee replacement radio set, offering a lower price, longer range and superior performance to Xbee radios. It's availabl in 915Mhz; and in the following configurations: serial board (for the air) and USB (for the ground)

Features of Single TTL 3DRobotics 3DR Radio Telemetry Kit 433Mhz 433 For APM 2.6 PX4 Flight Controller:

• Very small size.
• Light weight (under 4 grams without antenna).
• Frequency-433MHz.
• Receiver sensitivity to -121 dBm.
• Transmit power up to 20dBm (100mW).
• Transparent serial link.
• Air data rates up to 250kbps.
• MAVLink protocol framing and status reporting.
• Frequency hopping spread spectrum (FHSS).
• Adaptive time division multiplexing (TDM).
• Support for LBT and AFA.
• Configurable duty cycle.
• Built in error correcting code (can correct up to 25% data bit errors).
• Demonstrated range of several kilometers with a small omni antenna.
• Can be used with a bi-directional amplifier for even more range.
• Open source firmware.
• AT commands for radio configuration.
• RT commands for remote radio configuration.
• Adaptive flow control when used with APM.
• Based on HM-TRP radio modules, with Si1000 8051 micro-controller and Si4432 radio module.

Applications of Single TTL 3DRobotics 3DR Radio Telemetry Kit 433Mhz 433 For APM 2.6 PX4 Flight Controller:

• Used in Quad copter.