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altimeter

(Encyclopedia)altimeter ăltĭmˈĭtər, ălˈtĭmēˌtər [key], device for measuring altitude. The most common type is an aneroid barometer calibrated to show the drop in atmospheric pressure in terms of linear e...

radar astronomy

(Encyclopedia)radar astronomy, application of radar to the determination of distances and planetary features within the solar system, such as rotation rates. A short burst of radio waves is transmitted in the direc...

antenna

(Encyclopedia)antenna ăntĕnˈə [key], in electronics, system of wires or other conductors used to transmit or receive radio or other electromagnetic waves (see radio); sometimes called an aerial. The idea of usi...

FM, abbreviation for frequency modulation

(Encyclopedia)FM: see modulation; radio. ...

AM, abbreviation for amplitude modulation

(Encyclopedia)AM: see modulation; radio. ...

audio frequency

(Encyclopedia)audio frequency: see sound; radio. ...

frequency modulation

(Encyclopedia)frequency modulation: see modulation; radio. ...

amplitude modulation

(Encyclopedia)amplitude modulation: see modulation; radio. ...

Marconi, Guglielmo, Marchese

(Encyclopedia)Marconi, Guglielmo, Marchese go͞olyĕlˈmō märkāˈzā märkôˈnē [key], 1874–1937, Italian physicist, celebrated for his development of wireless telegraphy (see radio). In the field of electro...

Davis, Elmer

(Encyclopedia)Davis, Elmer, 1890–1958, American newspaperman, radio commentator, and author, b. Aurora, Ind. Davis was a Rhodes scholar (1910–13) at Oxford. For 10 years (1914–24) he was on the staff of the N...