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- Coherer abstract "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 by Italian physicist, 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. Beginning around 1890, other researches were done by Oliver Lodge, Alexander Popov, Edouard Branly, and Guglielmo Marconi used it in the first historic experiments in radio communication, and it became the basis for radio reception, and remained in widespread use until about 1910. It was superseded by more sensitive electrolytic and crystal detectors and became obsolete, although in the 1950s a coherer was briefly used in at least one radio-controlled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 and a later imperfect junction type.".
- Coherer thumbnail Coherer.jpg?width=300.
- Coherer wikiPageExternalLink 1898sla.htm.
- Coherer wikiPageExternalLink coherer.html.
- Coherer wikiPageExternalLink enewrc.html.
- Coherer wikiPageExternalLink objects-i=3.001-t=3-n=0.html.
- Coherer wikiPageExternalLink 347062-US-Patent-613809--Nikola-Tesla.html.
- Coherer wikiPageID "296058".
- Coherer wikiPageRevisionID "595997018".
- Coherer align "center".
- Coherer align "right".
- Coherer caption "A "ball" coherer, designed by Branly in 1899. This imperfect contact type had a series of lightly touching metal balls between two electrodes.".
- Coherer caption "Another tripod detector built by Branly".
- Coherer caption "One of the first coherers designed by Edouard Branly. Built by his assistant.".
- Coherer caption "Tripod coherer, built by Branly in 1902, another imperfect contact type. Although most coherers functioned as "switches" that turned on a DC current from a battery in the presence of radio waves, this may be one of the first rectifying detectors, because Branly reported it could produce a DC current without a battery.".
- Coherer direction "horizontal".
- Coherer direction "vertical".
- Coherer footer "The coherer as developed by Marconi consisted of metal filings enclosed between two slanted electrodes a few millimeters apart, connected to terminals.".
- Coherer hasPhotoCollection Coherer.
- Coherer image "Cohere.jpg".
- Coherer image "Coherer.gif".
- Coherer image "Radioconducteur 05.jpg".
- Coherer image "Radioconducteur 07.jpg".
- Coherer image "Radioconducteur 1.jpg".
- Coherer image "Trepied 01.jpg".
- Coherer width "235".
- Coherer width "300".
- Coherer width "96".
- Coherer subject Category:Detectors.
- Coherer subject Category:Electronic_amplifiers.
- Coherer subject Category:History_of_radio.
- Coherer subject Category:Radio_electronics.
- Coherer type Amplifier102705944.
- Coherer type Artifact100021939.
- Coherer type Detector103180969.
- Coherer type Detectors.
- Coherer type Device103183080.
- Coherer type ElectronicAmplifiers.
- Coherer type ElectronicEquipment103278248.
- Coherer type Equipment103294048.
- Coherer type Instrumentality103575240.
- Coherer type Object100002684.
- Coherer type PhysicalEntity100001930.
- Coherer type Whole100003553.
- Coherer comment "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 by Italian physicist, 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.".
- Coherer label "Coesor".
- Coherer label "Coesore".
- Coherer label "Coherer".
- Coherer label "Coherer".
- Coherer label "Cohesor".
- Coherer label "Cohéreur".
- Coherer label "Fritter".
- Coherer label "Koherer".
- Coherer label "Когерер".
- Coherer label "コヒーラ検波器".
- Coherer sameAs Koherer.
- Coherer sameAs Fritter.
- Coherer sameAs Cohesor.
- Coherer sameAs Cohéreur.
- Coherer sameAs Coesore.
- Coherer sameAs コヒーラ検波器.
- Coherer sameAs Coherer.
- Coherer sameAs Koherer.
- Coherer sameAs Coesor.
- Coherer sameAs m.01r83g.
- Coherer sameAs Q944090.
- Coherer sameAs Q944090.
- Coherer sameAs Coherer.
- Coherer wasDerivedFrom Coherer?oldid=595997018.
- Coherer depiction Coherer.jpg.
- Coherer isPrimaryTopicOf Coherer.