Radio is simply the technology of transmitting and broadcasting using
radio hören waves as the carrier. Radio waves consist of electromagnetic waves of very high frequency, usually between thirty to three hundred kilohertz, and can be used with a range of equipment from simple personal computers to satellites orbiting the Earth. The first artificial radio systems were developed in the 1930s, and since then they have become a fundamental communication medium all over the world. When you listen to your favorite radio show, you are hearing a form of radio transmission, and while most people have only a vague idea of what radio transmitters are, they are fairly easy to understand once you learn more about them.
The radio transmitters send radio waves out into space, where they are received by the receiver. The receiver on some devices allows the user to send their own radio signals back into space. This is done by a separate device which is in direct contact with the transmitter for the user's radio. Once these signals are received, they are converted into binary data that can be decoded and sent back to the base station. The base station sends this signal out into the universe, and it is returned by another radio transmitter. The process is repeated many times a day, sending radio signals all over the world at high frequencies, allowing people to communicate with each other across great distances.
The technology used by radio stations today has changed drastically since the advent of regular radio stations, and the way in which they operate has also changed. While the basic principle remains the same, modern radio stations now use a variety of different methods for broadcasting their signals. For instance, many radio stations now use digital broadcasting, where the transmitter is programmed in real time with data from an interested party who wishes to listen in. Digital broadcasting allows the transmitter to "talk" to the receiving radio and even to send a reply at the same time, much like email.
