The 3DR Radio Telemetry 433Mhz 1000MW with 2~3km Data Telemetry has an independent signal amplifier (1W). Both modems here have the same design and can be used both in the ground station and in the air, and each also has a Micro USB TTL connector. The small omnidirectional antenna has a range of several kilometers, with a bidirectional amplifier a longer range is achievable. This product is based on HM-TRP radio modules with Si1000 8051 microcontrollers.
 Features independent signal amplifier (1W) 3 types of cables for APM and Pixhawk (5P for APM, 6P for Pixhawk) OGT open source firmware both modems have a Micro USB TTL connector same design for both modems both modems can be used in the ground station as well as in the air extend the range with bidirectional amplifier MAVLink protocol framing and status reporting Transparent serial connection Frequency hopping spread spectrum (FHSS)\nAdaptive time division multiplexing (TDM) Support for LBT and AFA Configurable duty cycle Built-in error correction code (up to 25% correction) AT commands for radio configuration RT commands for remote radio configuration Specification: Model: 3DR Radio Telemetry V3 Frequency: 433Mhz Receive sensitivity: -140dBm Transmit power: up to 30dBm (1000mW@9600bps) CP2102 USB to TTL Chips Air data rate: up to 250kbps