Radio reception. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Radio reception. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur

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Radio waves cannot be detected by any of our senses. But if a conductor is encountered on the path of radio waves, they give it a part of all energy. The reception of radio broadcasts is based on this phenomenon. "Catching" the energy of radio waves during the operation of your first receiver was carried out by an antenna. Giving the antenna part of the electromagnetic energy, the radio waves induced modulated high-frequency oscillations in it.

In the receiver, processes are reversed to those that occur in the studio and on the transmitter of the radio station. If there the sound is sequentially converted first into electrical oscillations of sound frequency, and then into modulated oscillations of high frequency, then the inverse problem is solved during radio reception: the high-frequency modulated oscillations excited in the antenna are converted by the receiver into electrical oscillations of sound frequency, and then into sound. In your first receiver, modulated high-frequency oscillations were converted into audio-frequency oscillations by a detector, and low-frequency oscillations into sound by headphones.

But after all, the radio waves of many radio stations penetrate the antenna of the receiver, exciting in it modulated oscillations of various frequencies. And if all these radio signals were turned into sounds, then we would hear hundreds of voices of people speaking different languages. It is unlikely that such radio reception would suit you. We, of course, are interested in listening to the transmissions of different stations, but not all at the same time, but each one separately. And for this, from the oscillations of all frequencies excited in the antenna, it is necessary to single out oscillations with the frequency of only the radio station whose transmissions we want to listen to.

This task is performed by an oscillatory circuit - an indispensable part of any radio receiver. It was thanks to the oscillatory circuit that you tuned your receiver to radio signals of different wavelengths.

Publication: N. Bolshakov, rf.atnn.ru

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