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Idoh Gersten Physics Idoh Gersten Mr. Zambizi Physics March 12, 1995 Radio is a form of communication in which intelligence is transmitted without wires from one point to another by means of electromagnetic waves. Early forms of communication over great distances were the telephone and the telegraph. They required wires between the sender and receiver. Radio, on the other hand, requires no such physical connection. It relies on the radiation of energy from a transmitting antenna in …

…must reinsert the nontransmitted carrier before successful heterodyning can take place. Radio has become a sophisticated and complex area of electrical engineering, especially when compared to its elementary origin. Every day new radio applications are being found, ranging from digital radio-controlled garage-door openers to weather satellites and from tracking systems for polar bear migrations to radio telescope investigations of the universe. This multiplicity of uses demonstrates the important part radio plays in the world today.