Kortvågige

Kortvågige, also known as shortwave radio, refers to a method of wireless communication that uses radio waves with wavelengths ranging from 10 meters to 100 meters. This frequency range is typically between 3 MHz and 30 MHz. Shortwave radio is widely used for international broadcasting, amateur radio, and emergency communications due to its ability to propagate over long distances, especially at night when the ionosphere reflects the radio waves back to Earth.

The propagation of shortwave radio signals is influenced by the ionosphere, a layer of the Earth's atmosphere that contains ionized particles. During the day, the ionosphere reflects shortwave signals, allowing them to travel over long distances. At night, when the ionosphere is less ionized, signals can travel even further, sometimes reaching thousands of kilometers.

Shortwave radio has several advantages over other forms of wireless communication. It can penetrate buildings and other obstacles more effectively than higher frequency signals, and it requires less power to transmit. However, it is also subject to interference from other radio signals and atmospheric conditions, which can affect its reliability.

Shortwave radio has a rich history, dating back to the early 20th century. It was used extensively during World War II for both military and civilian communications. Today, it remains an important tool for international broadcasting and amateur radio enthusiasts. Despite the advent of digital communication technologies, shortwave radio continues to be used in emergency situations and by those who value its unique characteristics.