Слайд 2Radio is…… Radio-wireless communication version at which as the signal carrier the
radio-waves freely extended in space are used.
Слайд 3Transfer occurs as follows: on the transferring party the signal with
demanded characteristics (frequency and amplitude of a signal) is formed. Further the transmitted signal modulates more high-frequency fluctuation (bearing). The received modulated signal is radiated by the aerial in space. On the reception party of a radio-wave direct the modulated signal in the aerial then it is demodulated it (is detected) and filtered . Thus, there is an extraction of a useful signal. The received signal can differ a little from transferred by the transmitter.
History and the radio invention. The founder of the first successful system
of information interchange by means of radio-waves (radiotelegraphy) the Italian engineer Gulelmo Marconi (1895) is considered.
Слайд 5History and the radio invention. In Soviet Union and consequently and in
Russia, as the inventor of radiotelegraphy consider A.S. Popov.
Слайд 6Minuses. Those people at which can listen to radio only there
is a radio receivers. Or those only at whom are the Internet (in a case about the radio Internet) People only listen to songs, but don't see clips under these songs (and stars)
Слайд 7Pluses. Radio convenient information receptions. Radio is convenient for listening of music
of the house, in a garden, in a city, on walk, on picnic. By radio it is possible to hear novelties of songs and old hits.
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