ABSTRACT
One of the pioneers of wireless transmissions, Armstrong started his career by building an amateur radio station when only 15 years old. Later, while at Columbia University, he studied under physicist Michael Pupin, and he was eventually appointed to the same teaching and research position that had been occupied by the great physicist. During his career he earned three different doctor of science degrees, and received more than a dozen awards for outstanding achievement. During his career, Armstrong developed the superheterodyne circuit that is the basis of almost all modern radio receiving and radar equipment, and went on to formulate the principles of radio frequency modulation in the 1930s. This contribution resulted in the development of FM radio.
