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Radio signals are made up of two kinds of waves: “audio” (or sound) waves represent the sounds being sent to the audience and radio frequency waves travel with these sound waves to "carry" them to radios in homes and car, for example. All waves have three parts: a wavelength, an amplitude and a frequency. Each of these parts can be changed to carry information.
Radio signals are made up of two kinds of waves: “audio” (or sound) waves represent the sounds being sent to the audience and radio frequency waves travel with these sound waves to "carry" them to radios in homes and car, for example. All waves have three parts: a wavelength, an amplitude and a frequency. Each of these parts can be changed to carry information.
==History of Radio==
An early type of radio receiver is the Crystal radio, or Crystal set. It was devised by U.S. radio pioneer Greenleaf Whittier Pickard about 1900 and patented by him in 1906.<ref>[https://worldwide.espacenet.com/publicationDetails/originalDocument?CC=US&NR=836531A&KC=A&FT=D&ND=3&date=19061120&DB=EPODOC&locale=en_EP U.S. patent 836531]</ref> G.W. Pickard's great-uncle was the anti-slavery campaigner John Greenleaf Whittier who was an honoree of the [[Hall of Fame for Great Americans]].
== AM Radio ==
== AM Radio ==