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Static Wikipedia: Italiano -Inglese (ridotta) - Francese - Spagnolo - Tedesco - Portoghese
 
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Radio

From Wikipedia, a free encyclopedia written in simple English for easy reading.

Radio is a communications invention that uses electromagnetic waves, or radio signals, to get electronic information from one place to another without the use of wires. The sending unit is called a transmitter. The unit that turns radio signals into sound that can be heard is called a receiver. Often, the receiver is referred to as a "radio." Though originally used to communicate between two people, it is now used to listen to music, news and people talking. This is known as "talk radio." Radio shows were the predecessor to TV programs. Radio can still be used to communicate. Talking to someone with a radio is different than "talk radio". Citizen's band radio, amateur radio and even cell phones use radio. Policemen, firemen and other people who help in times of trouble use radio to communicate. Television also uses radio signals to transmit both picture and sound. Radio signals can even be used to make models move on their own by remote control. (See: Radio control.)

Companies that broadcast (or send) music, news, talk or other forms of one-way radio are called radio stations. An Italian man named Guglielmo Marconi is credited with inventing radio, through his experiments with sending radio waves. Engineer Nikola Tesla developed radio into a practical means of audio communication, though he did not always receive the credit he was due.

A new invention, satellite radio, is one where digital signals are first sent to a satellite in outer space, and bounced back to Earth. Special receivers are needed to listen to satellite radio. One also has to pay a monthly fee for satellite radio service. Satellite radio has many channels to choose from, most without commercials. That is why a monthly fee is charged, since other radio stations usually make their money through the sale of advertising. The sound quality of satellite radio is much like that you would hear on a compact disc, perhaps even better. There are two satellite radio services in the US: XM Satellite Radio and Sirius Satellite Radio. The original way of broadcasting radio is now sometimes called terrestrial radio, so as not to mix it up with satellite radio. Europe has digital radio as well, but does not use satellites to send the signal.

Radio can be in the FM bandwidth or the AM bandwidth.

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