According to the University of Southern California, radios work by encoding information on radio waves then broadcasting the radio wave with the encoded information onto a particular frequency. Both AM and FM radios use radio waves to transmit programs on radio stations.Continue Reading
According to About.com, radio waves "are part of a broad range of electromagnetic waves that include visible light, X-rays, gamma rays and others." The difference between radio waves and electromagnetic waves, such as visible light and X-rays, is that they are invisible. Electromagnetic waves are generated using alternating currents (AC), which are commonly found in household appliances. An increase in the frequency of an alternating current causes more electricity to escape into the air as electromagnetic radiation.
Radios work by converting the electricity that escapes into the air into signals that can transmit music or voices. The process of transforming electromagnetic waves into sound is called modulation. AM and FM radios are designed to transmit the amplitudes and frequencies of radio waves. AM stands for amplitude modulation, whereas FM stands for frequency modulation. AM radio encodes information by determining the different amplitudes of a single and converting these amplitudes into an audible signal. FM radios decode the changes in frequency into an audible signal.Learn more about Audio Equipment
Walkie talkies use radio waves transmitted and received by an antenna tuned to a single bandwidth, and then convert the electronic signals into sounds using a magnetic coil and a paper or plastic cup. Walkie talkies are a common method of sharing information over a short to medium range area.Full Answer >
The basic difference between AM and FM radio is contained in their names; AM stands for amplitude modulation while FM stands for frequency modulation. The way in which radio waves are manipulated to produce sounds in a radio creates differences which affect the quality of the signal.Full Answer >
Walkie-talkies are small portable radios with both a receiver and a transmitter. They can both broadcast and pick up radio signals and make for an easy way to communicate when cellphone signals are not available.Full Answer >
A dipole antenna uses two conductors of the same length to detect radio waves and transmit the corresponding variable electrical current to a receiver. Each conductor represents one-quarter of a wavelength, and when combined, the dipole can detect a half-wavelength signal. The length of the two conductors determines the operational frequency.Full Answer >