Commonly used communication frequency bands for drones

Drone remote controllers usually use the 840.5-845MHz, 1430-1444MHz, 2408-2440MHz and 5.8G frequency bands for communication. Specifically:

1. 840.5-845MHz: This frequency band is mainly used for the uplink remote control link of the unmanned aircraft system. This means that the drone receives signals from the remote control to execute flight operation instructions, such as takeoff, landing, steering, etc., using this frequency band. Among them, 841-845MHz can also be used for the uplink remote control and downlink telemetry links of the unmanned aircraft system in a time-division manner.
2. 1430-1444MHz: This frequency band is used for the downlink telemetry and information transmission link of the unmanned aircraft system. This includes data sent back from the drone, such as location, speed, altitude, battery power and other information. It should be noted that the 1430-1438MHz frequency band is designated for police unmanned aircraft and helicopter video transmission, while other unmanned aircraft use the 1438-1444MHz frequency band.
3. 2408-2440MHz: This frequency band is also planned for unmanned aerial vehicle systems. The advantages of the 2.4G frequency band are as follows:
   • Strong diffraction ability: The wavelength of the 2.4GHz frequency band is longer, which can better bypass obstacles and provide a longer transmission distance. It is suitable for non-image transmission drones such as model aircraft.
   • Good compatibility: 2.4GHz is one of the earliest wireless communication frequency bands used. Many devices such as wireless routers use this frequency band, so it has good compatibility.
   • Strong transmission ability: In a home environment, the transmission ability of 2.4GHz is strong, but it may encounter more interference in a dense wireless environment.
4. 5.8Ghz: is mainly used for control and image transmission. The advantages are as follows:
   • Wider bandwidth: The channel bandwidth provided by the 5.8GHz frequency band is wider, which can support higher data transmission rates and is suitable for image transmission machines that require high-speed data transmission.
   • Less interference: Compared with 2.4GHz, the 5.8GHz frequency band usually encounters less interference, especially in home and office environments. Signal quality: Some advanced drone technologies, such as DJI, can automatically select the best channel and even quickly switch between two frequency bands to optimize signal quality.

For the common communication frequency bands of drones, use radio technology to detect and counter them, and at the same time protect the surrounding electromagnetic environment. There are various means of countering drones. In the face of drone intrusions in complex situations, it is necessary to combine early warning, investigation and strike, and integrate multiple technologies to truly achieve airspace security.