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Ernst Frederick Werner Alexanderson (January 25, 1878 – May

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Charlotte Liu

on 21 May 2014

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Transcript of Ernst Frederick Werner Alexanderson (January 25, 1878 – May

The invention of Radio
Alexanderson designed the Alexanderson alternator, an early long wave radio transmitter, one of the first devices which could transmit modulated audio (sound) over radio waves.
Fessenden had been working on the problem of transmitting sound by radio waves, and had concluded that a new type of radio transmitter was needed, a continuous wave transmitter.

On Christmas Eve, 1906, 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 Coast as far as Arlington. This is considered the first AM radio entertainment broadcast.
One of the best advantages of radio advertising is the ability to reach so many people at one time. Anyone that listens to that radio station can hear your commercial rather than just the people who drive down a certain road seeing your billboard.

For entertainment
In many uses
In different shapes
Ernst Frederick Werner Alexanderson
He was a Swedish-American electrical engineer, who was a pioneer in radio and television development. He invented the Alexanderson alternator, an early radio transmitter used between 1906 and the 1930s for long wave long distance radio transmission.
Ernst Frederick Werner Alexanderson (January 25, 1878 – May 14, 1975)
two famous Inventions
---Radio and television development.
---The Alexanderson alternator, an early radio transmitter

The transmitter room
Different size of radio
Radio used by normal families
The old radio builder
Ernst Frederick Werner Alexanderson
invention of radio
Had a huge impact to the world
Development and impact


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