COHERER

Coherer

The coherer is a primitive form of radio signal detector used in the first radio receivers during the wireless telegraphy era at the beginning of the 20th century. Invented around 1890 by French scientist Édouard Branly, it consists of a tube or capsule containing two electrodes spaced a small distance apart, with metal filings in the space between them. When a radio frequency signal is applied to the device, the initial high resistance of the filings reduces, allowing an electric current to flow through it. The coherer was a key enabling technology for radio, and was the first device used to detect radio signals in practical spark gap transmitter wireless ...

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coherer

Noun

  1. A detector of radio waves used in very early radio receivers


The above text is a snippet from Wiktionary: coherer
and as such is available under the Creative Commons Attribution/Share-Alike License.

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