Let us consider the fundamentals of radio broadcasting.
Broadcast call transfer music, lectures, speeches, interviews and various information for a wide range of listeners.

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The first experiments on the transmission of speech began in 1905, however, this problem has remained unsolved for a long time. This was due to the use of imperfect transmitters, which used spark, arc, or dynamo-electric generators of high frequency currents.

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Only with the advent of vacuum-tube oscillators became possible to carry voice and music. Modern radio in two ways: by radio and by wire, with the same transfer can be done through a series of simultaneous radio and wire broadcasting network.
On the radio transmission of lectures held over all branches of science and technology, broadcast of the opera and concerts, and expands upon the material on the international situation, regularly transmitted reports on weather conditions and forecasts for weather around the country. On the radio ads make about their products, many of the firm.