Radio Principles refers to the physical principles and techniques of transmitting information over long distances by wireless telegraphy.
Radio signals are generated by generators or oscillating circuits that transmit signals by continuously transmitting electromagnetic waves with frequencies varying within a certain range. Frequency modulation and amplitude modulation are often used in transmission to change the strength of the signal so that the equipment receiving the signal can receive and reproduce the signal through electronics, which can be converted to original information such as sound, pictures, or numbers.
Applications of radio
1, communication. Communication devices such as satellites and cell phones transmit signals through radio technology. The use of radio waves to transmit signals over a wide range allows people to communicate and communicate over long distances.
2, monitoring and control. Radio technology can be applied to monitor rainfall, temperature, water level and other environmental parameters, such as meteorology, hydrology and so on. It can also be used for remote control, such as airplanes, rockets, remote control toys and so on.
3, transportation. In the field of modern transportation, radio technology is widely used in vehicle communications, ship navigation, train operation control and so on. Such as the use of GPS navigation systems, cab drivers, couriers, etc. quickly and accurately find the target location, in the petroleum, chemical, railroad and other industries, radio technology can be realized in remote monitoring and control work.
4, broadcasting. Broadcasting is also an important radio application. By utilizing antennas to transmit information (audio or video), the broadcasting range and transmission effect per unit of time has been greatly improved.
5. Satellite communications. Satellite communications can communicate anywhere on the globe. The use of satellite's height advantage, wide coverage, not subject to weather and other restrictions, making the quality of communication more stable.
6, medical. In the medical field, the use of radio technology to monitor and diagnose disease is very common. Portable life detection instruments and dental diagnostics, etc. can use radio technology to work.
7, household products. Common household radio products include wireless phones, remote controls, floor sweepers and so on. These products rely on radio technology for data transmission and remote control commands.