The 3DR Radio USB unit is part of the new telemetry system offered by 3D Robotics; it would work in conjunction with the "Air" module offering a 2-way half duplex wireless communication system. Its design is based off the HM-TRP modules from HopeRF along with a completely new firmware to optimize its performance, SiK.
Hardware features and specifications
Very small size
Light weight (under 4 grams without antenna)
Available in 900MHz or 433MHz variants
Receiver sensitivity to -121 dBm
Transmit power up to 20dBm (100mW)
Transparent serial link
Air data rates up to 250kbps
Range of approx 1 mile
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 the HopeRF HM-TRP radio module, featuring an SiLabs Si1000 RF microcontroller.
Features
'Air' and 'ground' variants, FTDI-style pinout and USB connector, respectively
433 and 915MHz variants
RP-SMA connector
Maximum output power of 100mW (20dBm), adjustable between 1-20dBm
-117dBm sensitivity
Standard TTL UART interface
Data transmit and connection status LED indicators