What does coherer mean?

Definitions for coherer
co·her·er

This dictionary definitions page includes all the possible meanings, example usage and translations of the word coherer.


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Wiktionary

  1. coherernoun

    A detector of radio waves used in very early radio receivers

Wikipedia

  1. Coherer

    The coherer was 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. Its use in radio was based on the 1890 findings of French physicist Édouard Branly and adapted by other physicists and inventors over the next ten years. The device consists of a tube or capsule containing two electrodes spaced a small distance apart with loose metal filings in the space between. When a radio frequency signal is applied to the device, the metal particles would cling together or "cohere", reducing the initial high resistance of the device, thereby allowing a much greater direct current to flow through it. In a receiver, the current would activate a bell, or a Morse paper tape recorder to make a record of the received signal. The metal filings in the coherer remained conductive after the signal (pulse) ended so that the coherer had to be "decohered" by tapping it with a clapper actuated by an electromagnet, each time a signal was received, thereby restoring the coherer to its original state. Coherers remained in widespread use until about 1907, when they were replaced by more sensitive electrolytic and crystal detectors.

Wikidata

  1. 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 1884-1886 by the Italian scientist Temistocle Calzecchi Onesti. 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 telegraphy. It became the basis for radio reception around 1900, and remained in widespread use for about ten years. It was superseded by more sensitive electrolytic and crystal detectors and became obsolete, although in the 1950s a coherer was briefly used in at least one radio-controlled toy. There are two basic kinds of coherers: the original metal filings type, called the Branly coherer; and a later imperfect junction type.

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Numerology

  1. Chaldean Numerology

    The numerical value of coherer in Chaldean Numerology is: 2

  2. Pythagorean Numerology

    The numerical value of coherer in Pythagorean Numerology is: 9

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"coherer." Definitions.net. STANDS4 LLC, 2024. Web. 28 Mar. 2024. <https://www.definitions.net/definition/coherer>.

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