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Marconi breakthrough
Italian inventor and engineer Guglielmo Marconi (1874-1937) developed, demonstrated and marketed the first successful long-distance wireless telegraph and in 1901 broadcast the first transatlantic radio signal. -
Developing wireless telegraphs
A Tesla coil is an electrical resonant transformer circuit designed by inventor Nikola Tesla in 1891. It is used to produce high-voltage, low-current, high frequency alternating-current electricity. -
The AUDION tube
Lee De Forest invented the audion, a vacuum tube device that could take a weak electrical signal and amplify it into a larger one. The audion helped AT&T set up coast-to-coast phone service, and it was also used in everything from radios to televisions to the first computers. -
Edwin Armstrong FM audio
In 1918, he invented the superheterodyne circuit, a highly selective means of receiving, converting, and greatly amplifying very weak, high frequency electromagnetic waves. His crowning achievement (1933) was the invention of wide-band frequency modulation, now known as FM radio. -
KDKA
KDKA (1020 kHz) is a Class A, clear channel, AM radio station, owned and operated by Audacy, Inc. and licensed to Pittsburgh, Pennsylvania. Its radio studios are located at the combined Audacy Pittsburgh facility in the Foster Plaza on Holiday Drive in Green Tree, and its transmitter site is at Allison Park. -
Golden Era of Radio
Golden Age of American radio, period lasting roughly from 1930 through the 1940s, when the medium of commercial broadcast radio grew into the fabric of daily life in the United States, providing news and entertainment to a country struggling with economic depression and war.