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Lucien LÚvy
Lucien LÚvy (1892-1965) was a very important French radio pioneer. Just before the First World War he received his engineering degree at lĺEcole SupÚrieure de Physique et Chimie in Paris.
In 1916 he became head of the laboratory of the military radio station on the Eiffeltower. That year the first transmitter (1,5 kW) was completed. He worked under the supervision of colonel Gustave FerriÚ, also an important radio pioneer.
LÚvy started experiments that lead to the invention of the superheterodyne principle*. In August 1917 the principle was patented in brevet n░ 493660. In 1918 an upgraded version of the principle followed, described in a second patent.
The Americans did not recognise his patents and attributed the invention to Edwin H. Armstrong. German inventor Walter Schottky also filed a patent 1918. Eventually in 1928 LÚvy, who had already sold it to AT&T, was entitled to the patent.
After World War I he founded Les ╔tablissements Radio L.L. In order to stimulate the sale of radios, in March 1926 a 1 kW radio transmitter, called Radio LL, started daily broadcasts in the rue de Javel in Paris.
*)The superheterodyne principle: If an oscillator signal is added to an incoming radio signal, a beat signal will result, that has a frequency of the difference between the two. A fixed filter can be built to narrowly select this beat frequency, and pass it on to a low-frequency amplifier. As the oscillator frequency is varied, different radio frequencies will be moved down to the beat frequency and so selected. In other words, a variable oscillator and a fixed, narrow filter can do the work of a variable narrow filter. This technique is used in practically every radio to this day.
Radio pioneer General Gustave FerriÚ visits the 2nd French Radio Exhibition in Paris in 1925. Lucien LÚvy is on his left.

This page was last edited on 28.03.2018