Evolution of Radio

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Evolution of the Radio from 1920 's to 1940s

As one of the most important means of communication , radio has undergone significant changes to better suit the needs of people from the basic up to the most sophisticated technology . It was during the 1920s when radio broadcasting has reached full scale . This development generated significant changes in the way people live their daily lives The crystal radio of this period functioned without batteries but can only be heard with the

aid of earphones . It then developed into radios electrically powered which come with loudspeakers resembling a trumpet Detroit based WWJ radio station as well as Pittsburg 's KDKA became the pioneers of commercial broadcasts . The first regular broadcast license was issued by the federal government to Springfield 's WBZ radio station on the 15th day of September 1921 . Other radio stations began to emerge around the country . It was on October 1922 when network broadcasting signaled its debut . In 1926 , the NBC established the Radio Corporation of America , becoming the premier national network (Godfrey and Leigh 28 . The generation of FM broadcast was discovered by Edwin H Armstrong in 1933 (Godfrey and Leigh 30 . Radio then became a versatile medium of communication . Military personnel , police , as well as airplane pilots made use of the tool for fast exchange of communication . In 1947 , the transistor was developed at the Bell Telephone Laboratories . The year 1925 to the beginning of the 1950 's...