Edwin Howard Armstrong - Early Work

Early Work

As an undergraduate, and later as a professor at Columbia University, Armstrong worked from his parent's attic in Yonkers, New York to develop the regenerative circuit, the superheterodyne receiver, and the superregenerative circuit. He studied under Professor Mihajlo Idvorski Pupin at the Hartley Laboratories, a separate research unit at Columbia University. Thirty-one years after graduating from Columbia he became Professor of Electrical Engineering, filling the vacancy left by the death of Professor J. H. Morecroft. He held the position until his death.

Armstrong contributed the most to modern electronics technology. His discoveries revolutionized electronic communications. Regeneration, or amplification via positive feedback is still in use to this day. Also, Armstrong discovered that Lee De Forest's Audion would go into oscillation when feedback was increased. Thus, the Audion could not only detect and amplify radio signals, it could transmit them as well.

While De Forest's addition of a third element to the Audion (the grid) and the subsequent move to modulated (voice) radio is not disputed, De Forest did not put his device to work. Armstrong's research and experimentation with the Audion moved radio reception beyond the crystal set and spark-gap transmitters. Radio signals could be amplified via regeneration to the point of human hearing without a headset. Armstrong later published a paper detailing how the Audion worked, something De Forest could not do. De Forest did not understand the workings of his Audion.

Armstrong's service as a signal officer in World War I led to his design of the superheterodyne circuit. The discovery and development of the technology made radio receivers, then the primary communications devices of the time, more sensitive and selective. Before heterodyning, radio signals often overrode and interfered with each other. Heterodyning also made radio receivers much easier to use, rendering obsolete the multitude of tuning controls on radio sets of the time. The superheterodyne technology is still used today. There was a dispute regarding who invented superheterodyne radio. Walter Schottky claimed that he had independently invented super heterodyne radio.

Read more about this topic:  Edwin Howard Armstrong

Other articles related to "early work, early, work":

Sauerbruch Hutton - Early Work
... The firm completed competition entries for Paternoster Square in London (1989), Tokyo International Forum (1989) and the Junction Building in Birmingham (1989) ... These schemes all offered socio-culturally and environmentally sustainable alternatives to the conventions in architecture and planning at the time ...
List of Important Physicists
... planetary motion, described elliptical motion of planets around the sun, developed early telescopes, invented the convex eyepiece, discovered a means of determining the magnifying ... Prize in Physics for the discovery of the electron and for his work on the conduction of electricity in gases Nikola Tesla (1856 - 1943) developer of modern alternating current (AC) flow, improved on ...
Leah Dizon - Biography - 2005–2007: Destiny Line, Early Work, and Career Debut
... She was asked by many Japanese fans—who had seen her photographs—to work in their country, which eventually prompted her to submit several demo tapes and dance videos to Victor ...
Shiloh Fernandez - Career - Early Work, 2006-2010
... Lucky for me, not getting that part led to other work that was a much better fit for me." Fernandez, who had no formal training, admitted being bashful around other actors during rehearsals ...

Famous quotes containing the words work and/or early:

    The belief that there are final and immutable answers, and that the professional expert has them, is one that mothers and professionals tend to reinforce in each other. They both have a need to believe it. They both seem to agree, too, that if the professional’s prescription doesn’t work it is probably because of the mother’s inadequacy.
    Elaine Heffner (20th century)

    We are living now, not in the delicious intoxication induced by the early successes of science, but in a rather grisly morning-after, when it has become apparent that what triumphant science has done hitherto is to improve the means for achieving unimproved or actually deteriorated ends.
    Aldous Huxley (1894–1963)