Q：Due to the flexibility, safety and ease of operation of drones, there is a strong demand for drones in many civil fields. Small drones can be widely used in disaster prevention and mitigation, search and rescue, nuclear radiation detection, traffic supervision, resource exploration, land and resources monitoring, border patrol, forest fire prevention, weather detection, crop production estimation, pipeline inspection and other fields. Due to the aviation characteristics of small drones and the characteristics of large-scale inspections, it has particular advantages in real-time monitoring and evaluation of natural disasters such as floods, droughts, earthquakes, and forest fires. The application of civil drones in the field of aerial survey can also be used as a supplement to satellite remote sensing.

Q：1. Check if the receiver power is connected and the power switch is turned on; 2. Check all cable connections, check whether the antenna is installed correctly, and whether the antenna connector has entered water, loosened or fallen off; 4. Whether the position of the transmitter is within the effective radio frequency coverage; 5. Check whether the transmitter works normally; 6. Check whether the power amplifier is normal; 7. Check if there is co-channel signal interference nearby; 8. Check whether the receiver frequency is consistent with the transmitter frequency