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Statements

Subject Item
dbr:Audion_receiver
rdfs:label
Audion receiver
rdfs:comment
An audion receiver makes use of a single vacuum tube or transistor to detect and amplify signals. It is so called because it originally used the audion tube as the active element. Unlike a crystal detector or Fleming valve detector, the audion provided amplification of the signal as well as detection. The audion was invented by Lee De Forest. In 1915 Edwin Armstrong developed an improved "regenerative" form of audion receiver that used the same vacuum tube for RF amplification, RF detection, and audio amplification.
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n7:vacuum_tube_audion.png n7:Vacuum_tube_audion.png
dcterms:subject
dbc:Types_of_radios
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23876126
dbo:wikiPageRevisionID
915898051
dbo:wikiPageWikiLink
dbr:Crystal_detector dbr:Fleming_valve dbr:Vacuum_tube dbr:Grid-leak_detector dbc:Types_of_radios dbr:Diode dbr:Square-law_detector dbr:Audion_tube dbr:Lee_De_Forest n16:Vacuum_tube_audion.png dbr:Tuned_radio_frequency_receiver dbr:Edwin_Howard_Armstrong dbr:Transistor
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n7:vacuum_tube_audion.png?width=300
dbo:abstract
An audion receiver makes use of a single vacuum tube or transistor to detect and amplify signals. It is so called because it originally used the audion tube as the active element. Unlike a crystal detector or Fleming valve detector, the audion provided amplification of the signal as well as detection. The audion was invented by Lee De Forest. In its operation, the circuit demodulates the radio frequency (RF) signal by rectification or square-law detection, and then amplifies this demodulated signal. The capacitor in series with the grid and parallel resistance forms a grid-leak detector which allow the grid to cathode to be used as a diode. In 1915 Edwin Armstrong developed an improved "regenerative" form of audion receiver that used the same vacuum tube for RF amplification, RF detection, and audio amplification.
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wikipedia-en:Audion_receiver?oldid=915898051&ns=0
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1255
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wikipedia-en:Audion_receiver