Definition Radio and Radio Waves - Radio is a technology that is used for signal transmission, by using the modulation method and the way radiation of electromagnetic waves. These waves propagate via tail passes and the air and can also propagate through space void of air, because these waves do not require a carrier medium (such as air molecules).
Today's communications technology is already highly sophisticated still uses the concepts of the radio wave. Even the astronauts to keep in touch with the Earth using radio signals due to electromagnetic waves can propagate in a vacuum.
The workings of radio is radio signal transmitted using the carrier wave. Radio waves are a part of the electromagnetic spectrum. With the longest wavelengths reflected by the air layer is high in the Earth's atmosphere, called the ionosphere. By using this method, the message over the radio could be reflected so as to achieve a great distance.
Radio waves are waves that have a fairly wide frequency range and is usually generated by the isolator circuit in electronic equipment. Radio wave spectrum bands separated in frequency or wavelength.
For additional information, currently two types of Commercial Radio broadcasts most often we encounter in the receiving device is a Radio Radio AM and FM Radio. Referred to AM (Amplitude Modulation) is the Low Frequency signal modulates the high frequency waves by changing the amplitude of the wave of High Frequency (Frequency carrier) without changing the Frequency.
While the definition of FM (Frequency Modulation) is the process of sending a low frequency signal by means of modulating the high frequency waves that serves as a carrier wave. So the difference between AM and FM is a process used in high frequency modulating a carrier frequency.