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Radio receiver designed for the extraction, conversion and use the energy of electromagnetic waves. 
The task of extracting the energy of electromagnetic waves from the environment and transform it into energy of high frequency currents performs the receiving antenna. Using resonant circuits tuned to a specific frequency, the receiver signal is allocated the correct station. 
Power of the received signal is usually very small, and the vast majority of receivers is amplifying stage. Further, the receiver is the process of converting the modulated high-frequency vibrations in the audio-frequency vibrations. This process is called the detection and the detection is carried out in stages. 
Receiver's output device, which uses a converted signal energy can be speaker phones, relays, recorder, etc. Radio receivers used in radio communications and radio broadcasting, television, radar and many other branches of engineering. 
Each radio is as follows: sensitivity, selectivity, quality of play. In addition to these core indicators, radio receiver, as well as other types of equipment, work is characterized by stability, efficiency, reliability and simplicity of design. 
The ability of the radio accept weak signals is called its sensitivity. The lower the input voltage required for normal operation of the receiver, the higher its sensitivity. Sensitivity broadcast receiver is tens of microvolts, a television receiver - hundreds of microvolts, or units of millivolts. 
Ability to provide the receiver signals the desired station is called selectivity.Transmitting radio stations operate at wavelengths close to each other. In addition, various technical devices emit radio interference. The higher the selectivity of the receiver, the less the effect on foreign radio stations and interference.