40kmNew RDFRemote900 data transreceiver 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 () and paparazzi. It has been used inautopilot ()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 of firmware of the first generation products. Second generation firmware has suffix. Characteristic: 1. Working rate 902MHz - 928MHz. 2. Outdoors ZUI transmission distance 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, 20dB. 5. Trans rate 250kbps in air. 6. can double antennas. 7. Working Temp -40----185. 8. Size 30mm x 57mm. 9. 15g (only Remote 900) Product specifications and models: 1. Frequency domain:902 MHzndash 928 MHz 2. output :1W+30 dBmcan be incr and decr in 1dB by software 3. Transmission rate in air:4816192432486496128192and250kbit/sec64K/128K equipment default 4. Receiver's sensitivity:121 dBm in short-data-rate-mode have large data rate 5. Size:30mmWx 57mmLX 12.8mmH - including RFshield cover cooling fin and connectors. 6. Weight:14.5g 7. Way to install:3timesM2.5 screw 8. Power supply:+5 V +3.5 V MIN+5.5 V MAX1800 mA max power It is a USBdata line that for changeover plug to serial port can data transmission and adjustment parameter when connect with PC. Connector: 1. port :RP-SMA double antenna ports 2. Communication port :RS232 connector 3. Power supply port:800mA (MAX) 4. I/O: 6 universal I/O (Digital, ADC, PWM ) Remote 900 data line Remote 900 connect line Color: As Shown Material: PC+Plastic Package Contents: 1 * Remote 900 module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.