The creation of a "supersonic heterodyne" radio receiver circuit, later abbreviated to "superheterodyne," was Armstrong's greatest achievement during this time. This circuit, which is still widely used today, increased the sensitivity and selectivity of radio receivers.
When was the radio invented by Edwin Armstrong?
1933
The superheterodyne circuit, which he developed in 1918, is a very selective method of capturing, converting, and significantly amplification relatively weak, high frequency electromagnetic waves. His greatest accomplishment, wide-band frequency modulation, or FM radio, was created in 1933.
Following this achievement, the Patent Office approved de Forest's two patents for the ultra-audion and the regenerative circuit. He subsequently filed a lawsuit against Armstrong for violating his ultra-audion patents. The Pennsylvanian court ruled in de Forest's favor.
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