40kmNew RDFRemote900 data transreceiver PX com-PIX3DR ground station. Remote 900 is a high performance ISM band wireless modem.The working frequency range is 902MHz-928MHz, which is a communication device for long distance data transmission. It is a communication device that can be used for long distance data transmission. This device has been used in autopilot (APM) and paparazzi. It has been used inautopilot (APM)andpaparazzi. At present, we have eliminated one generation of products. The first generation has low receiving sensitivity, interference between adjacent frequencies, and accidental disconnection of connection during flight. In order to solve these problems, it has been upgraded to the second generation. Compared with the first generation, we have made the following improvements: 1. The low-pass filter (LNA) is updated with higher gain and IP3, which is suitable for complex electromagnetic environment. Compared with the first generation rfd900, the sensitivity is increased about 1-2db. 2. Compared with the first generation rfd900, the CPU, ram and flash memory are updated. 3. Add ESD protection and filtering - each IO port is protected and filtered. Reduced electromagnetic radiation How to distinguish the first generation and second generation products: Note: generation 1 and generation 2 firmware are not universal. a is the suffix at the end of firmware of the first generation products. Second generation firmware has a p suffix. Characteristic: 1. Working rate 902MHz - 928MHz. 2. Outdoors ZUI transmission distance Greater than 40km,transmitted power can be adjust.(according antenna's quality). 3. Double antennas can switch according to the signal intensity. 4. Low-pass filter(high-cut filter),low noise amplifier, Greater than 20dB. 5. Trans rate 250kbps in air. 6. can double antennas. 7. Working Temp -40℉----185℉. 8. Size 30mm x 57mm.