How Does Radio Work?
Radio works by transmitting radio waves, a form of electromagnetic radiation with a frequency below visible light, to carry information. Information is stored in radio waves by modulating one or more of their properties. Examples of radio wave properties are amplitude (magnitude of oscillation) and frequency (repetition within a set period of time). When the radio waves pass through an electrical conductor, the modulations can be detected by means of the electrical current they create. This current can then be read and turned into usable information, such as voice transmissions.
What is Shortwave?
Shortwave radio operates between 3 MHz and 30 MHz. The name originates in from the early radio era, as these are wavelengths that are shorter than the ones that were previously in use at that time. Another name for shortwave is high frequency, or HF. Short wavelengths always mean higher frequencies. Because of this characteristic, the radio waves bounce off the upper atmosphere rather than shoot out into space. In theory, a shortwave broadcast could reach anywhere on Earth.
Pros and Cons
Shortwave radio transmissions have much greater potential range than longwave transmissions. Longwave transmissions are the basis for your local AM radio stations; shortwave transmissions are for regional or even international audiences. However, they are also much more prone to interference from overcrowding on a radio band, or from atmospheric disturbances. Furthermore, sound quality on shortwave bands are typically lower.
Tags: radio waves, Shortwave radio
