The RFD900 is a long range data telemetry modem operating in the 902-928MHz ISM band. Operating at 1W transmission power, it is capable of holding a data link at over 40km. Compatible with APM 2.x and Pixhawk. More details available at the manufacturer's site, rfdesign.com.au. Included in Package: 2x RFD900+ Modems 2x Monopole 2dBi Antennae 2x Dipole 3dBi Antennae 1x FTDI Cable 1x Pixhawk1 to RFD900+ Telemetry Cable (DF-13 Connector) 1x Pixhawk2.1 to RFD900+ Telemetry Cable (JST-GH) Features: Utilizes the powerful and open source telemetry protocol SiK Long range >40km depending on antennas and GCS setup 2 x RP-SMA RF connectors, diversity switched. 1 Watt (+30dBm) transmit power. Transmit low pass filter. > 20dB Low noise amplifier. RX SAW filter. Passive front end band pass filter. Open source firmware / tools, field upgradeable, easy to configure. Small, light weight. License free use in Australia, Canada, USA, NZ. Specifications: Frequency Range: 902 - 928 MHz (USA) / 915 - 928 MHz (Australia) Output Power: 1W (+30dBm), controllable in 1dB steps ( +/- 1dB @ <20dBm, +/- 0.5dB >=20dBm typical ) Air Data transfer rates: 4, 8, 16, 19, 24, 32, 48, 64, 96, 128, 192 and 250 kbit/sec ( User selectable, 64k default ) UART data transfer rates: 2400, 4800, 9600, 19200, 38400, 57600, 115200 baud ( User selectable, 57600 default ) Receive Sensitivity: >121 dBm at low data rates, high data rates (TBA) Size: 30 mm (wide) x 57 mm (long) x 12.8 mm (thick) - Including RF Shield, Heatsink and connector extremeties Weight: 14.5g Mounting: 3 x M2.5 screws, 3 x header pin solder points Power Supply: +5 V nominal, (+3.5 V min, +5.5 V max), ~800 mA peak at maximum power Temp. Range: -40 to +85 deg C