Ernst F.W. Alexanderson, in full Ernst Frederik Werner Alexanderson, (born Jan. 25, , Uppsala, Swed.—died May 14, , Schenectady, N.Y., U.S.). Ernst Alexanderson ( – ); a Swedish-American electrical engineer, a pioneer of radio and television development; received US patents. The man who developed the high frequency generator that made this possible, and much more, was Dr. Ernst Alexanderson. Ernst Alexanderson. Alexanderson .

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Ernst Frederick Werner Alexanderson January 25, — May 14, was a Swedish-American electrical engineerwho was a pioneer in radio and television development. He invented the Alexanderson alternatoran early radio transmitter used between and the s for longwave long distance radio transmission.

Alexanderson also created the amplidynea direct current amplifier used during the Second World War for controlling anti-aircraft guns. Alexanderson was born at Uppsala, Sweden. He emigrated to the United States in and spent much of his life working for the General Electric and Radio Corporation of America. Alexanderson designed the Alexanderson alternatoran early longwave radio transmitterone of the first devices which could transmit modulated audio sound over radio waves.

He had been employed at General Electric for only a short time when GE received an order from Canadian-born professor and researcher Reginald Fessendenthen working for the US Weather Bureau, for a specialized alternator with much higher frequency than others in existence at that time, for use as a radio transmitter. Fessenden had been working on the problem of transmitting sound by radio wavesand had concluded that a new type of radio transmitter was ernet, a continuous wave transmitter.


Ernst F. Alexanderson – Electrical Pioneer

Designing a machine that would rotate alexandersno enough to produce radio waves proved a formidable challenge. Alexanderson’s family were convinced the huge spinning rotors would fly apart and kill him, and he set up a sandbagged bunker from which to test them. In the summer of Mr. Alexanderson’s first effort, a 50 kHz alternator, was installed in Fessenden’s radio station in Brant Rock, Massachusetts. On Christmas Eve,Fessenden made an experimental broadcast of Christmas music, including him playing the violin, that was heard by Navy ships and shore stations down the East Alexnaderson as far as Arlington.

This is considered the first AM radio entertainment broadcast. Alexanderson continued improving his machine, and the Alexanderson alternator became widely used in high power very low frequency commercial and Naval wireless stations to transmit radiotelegraphy traffic at intercontinental distances, until by the s it was replaced by vacuum tube transmitters. The only surviving transmitter in a working state is at the Grimeton radio station outside VarbergSweden.

Ernst F.W. Alexanderson

Alexanderson was also instrumental in the development of television. Alexanderson retired from General Electric in The inventor and engineer remained active to an advanced age. He continued television research as a consultant for the Radio Corporation of America filing his st patent application in Ernstt his lifetime, Alexanderson received US patents, the last filed in at age Alexanderson is also mentioned in connection with the emergence of the patent system, that he was partially critical to.

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As the technology historian David Noble writes:.

Alexanderson, a Swedish immigrant who became one of GE’s early leading research engineers. In this it has not succeeded Ernst was very active and got a total of patents granted. From Wikipedia, the free encyclopedia. Ernst Frederick Werner Alexanderson.

Schenectady, New YorkUnited States. Retrieved 7 July Retrieved December 1, The Radioscientist — volume 5 number 3. Engineering and Technology History. Coolidge Frank B. Jewett Charles F. Scott Frank Conrad Ernat W.

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