Radio is the technology of signaling and communicating using radio waves. Radio waves are electromagnetic waves of frequency between 30 hertz (Hz) and 300 gigahertz (GHz). They are generated by an electronic device called a transmitter connected to an antenna which radiates the waves, and received by a radio receiver connected to another antenna.
Radio is a way to send electromagnetic signals over a long distance, to deliver information from one place to another. A machine that sends radio signals is called a transmitter, while a machine that "picks up" the signals is called a receiver or antenna. A machine that does both jobs is a "transceiver".
In radio communications, a radio receiver, also known as a receiver, a wireless or simply a radio, is an electronic device that receives radio waves and converts the information carried by them to a usable form. It is used with an antenna.
People also ask
What are facts about the radio?
How much does iHeartRadio cost?
What is radio history?
Who is the creator of radio?
Radio.com is a free broadcast and Internet radio platform owned by Entercom.Radio.com functions as a music recommender system and is the national umbrella brand for Entercom's radio network aggregating its over 235 local Entercom radio stations across the United States.
Internet radio also provided new opportunities to mix music with advocacy messages. In February 1999, Zero24-7 Web Radio was launched. It was the first internet radio station to be crowdsourced and programmed by professional broadcasters and crowdfunded by a unique partnership of people, charities and businesses.
Amateur radio, also known as ham radio, is the use of radio frequency spectrum for purposes of non-commercial exchange of messages, wireless experimentation, self-training, private recreation, radiosport, contesting, and emergency communication.
The idea of radio as entertainment took off in 1920, with the opening of the first stations established specifically for broadcast to the public such as KDKA in Pittsburgh and WWJ in Detroit. More stations opened in cities across North America in the following years and radio ownership steadily gained in popularity.
Radio waves in the shortwave band can be reflected or refracted from a layer of electrically charged atoms in the atmosphere called the ionosphere. Therefore, short waves directed at an angle into the sky can be reflected back to Earth at great distances, beyond the horizon. This is called skywave or "skip" propagation.