This week we’re celebrating National Radio Day! The radio was invented in the late 1800s. Many people were involved in the invention. Several methods of transmission and reception were considered before electromagnetic waves made radio possible as it is today. During the 1860s, Scottish physicist, James Clerk Maxwell predicted the existence of radio waves. The first intentional transmission of a signal was performed by David Edward Hughes around 1880. In 1886, German physicist, Heinrich Rudolf Hertz demonstrated that rapid variations of electric current could be projected into space in the form of radio waves similar to those of light and heat. After Hertz’s work many people were involved in the development of components and theory with the transmission and reception of electromagnetic waves. Others, notably Guglielmo Marconi, were concerned with practical improvements and the commercial application of radio to wireless telegraphy. Later on Reginald A. Fessenden became the first to send an audio signal by means of electromagnetic waves.
Did you know when the United States entered the first world war in 1917, all radio development was controlled by the U.S. Navy to prevent its possible use by enemy spies?
Frequency-modulated (or FM )radio was invented in 1933. Radio technology has grown significantly since its early development. In 1947, Bell Labs scientists invented the transistor. In 1954, a small Japanese company called Sony introduced the transistor radio.
According to the FCC, as of September 30, 2011, there were 14,865 radio stations in the United States. What’s your favorite radio station?