Radio aerials sited on the roof of the Science Museum, London, 1980s.

Lepine, John

Radio aerials sited on the roof of the Science Museum, London, 1980s.
3 4 c m
40cm
actual image size: 32cm x 26cm

Description

In order to be transmitted, the information in a radio signal is used to modulate a radio-frequency wave. The modulated signal is then amplified, and projected into space by a transmitting antenna. The signals can then be picked up by the aerial of a radio receiver tuned in to the wavelength of the transmision. The first radio signals were succesfully sent by Guglielmo Marconi (1874-1937) in 1894. Marconi devised a means of sending telegraphic mesages, but it was not until 1906 that Reginald Fesenden (1866-1932) developed amplitude modulation, enabling him to make the first sound broadcast. This marked the birth of radio broadcasting as we know it today.

Image Details

Artist
 
Image Ref.
 
10305511

© Science Museum / Science & Society Picture Library

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