transmitter detector

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• infinity transmitter — infinity microphone or infinity transmitter, an extremely sensitive and far ranging listening device concealed in a telephone: »The CIA is believed to be making extensive use of the “infinity microphone”…Hitched to the victim s telephone, it can… …   Useful english dictionary

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• Reginald Fessenden — Infobox Celebrity name = Reginald Fessenden caption = The Father of Radio Broadcasting birth date = birth date|1866|10|6|mf=y birth place = East Bolton, Quebec, Canada death date = death date and age|1932|7|22|1866|10|6|mf=y death place = Bermuda …   Wikipedia

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• Coherer — Metal filings 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 twentieth century. Invented around 1890 by French scientist Édouard… …   Wikipedia