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How does a radio work?
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May 30, 2023 · How Radio Works. By: Marshall Brain & Talon Homer | Updated: May 30, 2023. Radio waves control everything from AM/FM broadcasts to wireless networks to garage door openers. William Taufic/Getty Images. Electromagnetic radio waves are one of the most significant discoveries for 20th and 21st century technology.
A receiver that picks up waves that carry sound is called a radio. A radio sends the electric signal through speakers so the sound can be heard. Each radio station sends out radio waves of a certain frequency. A person changes a radio from one frequency to another to hear different stations.
The flow of the electricity creates radio waves that travel out the antenna and travel all the way to your radio. Your radio catches these radio waves which cause an electrical current in your radio. Your radio then turns this current into sound that you can hear! Whats AM, FM and DAB? AM. AM stands for Amplitude Modulation.
- Broadcasting. Main page: Broadcasting. AM radio station. FM radio station. Television station. Broadcasting antennas. Broadcasting is the one-way transmission of information from a radio transmitter to receivers belonging to a public audience.
- Jamming. Radio jamming is the deliberate radiation of radio signals designed to interfere with reception of other radio signals. Since radio waves can pass beyond national borders, some totalitarian countries which practice censorship use jamming to prevent their citizens from listening to broadcasts from radio stations in other countries.
- Two way voice communication. (left) Modern cellphone. (right) Cellular phone tower shared by antennas belonging to 3 different networks. A two-way radio is an audio transceiver, a receiver and transmitter in the same device, used for bidirectional person-to-person voice communication with other users with similar radios.
- One way voice communication. One way, unidirectional radio transmission is called simplex. Baby monitor – this is a cribside appliance for mothers of infants that transmits the baby's sounds to a receiver carried by the mother, so she can monitor the baby while she is in other parts of the house.
The receiver's tuner picks out a specific signal. Its amplifier strengthens that signal. A demodulator separates the signal from the carrier wave. And then a speaker converts the signal to the sound waves that you hear! Overview of radio waves, including discussion of frequency and amplitude modulation.
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How Radio Works. Courtesy of Voice of America. Radio signals travel by means of electromagnetic waves. But radio waves are not the only type of electromagnetic wave. Light is another, as are X rays, gamma rays, and cosmic rays ( see radiation ).
