Word: antennas
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Dates: during 1940-1949
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...Army used what it called "Sferic" - Static Direction Finder - a device developed in Florida and combat-tested in the storm-ridden Pacific theater. Sferic employs a radar-like directional antenna (two mutually perpendicular receiving loops) and cathode-ray tube. Certain types of storms are accompanied by severe electrical disturbances, familiar to every radio listener as the crashing static that accompanies a thunderstorm...
Sferic's antenna, revolving like a non stop merry-go-round, seeks out these static signals and relays them to the weatherman as straight-line flashes on the face of the cathode-ray tube. The angular positions of the flashes indicate the di rection the storm is taking. A network of stations taking simultaneous observations of the same flashes can locate their source and spot a storm position in a 2,000-mile radius. One drawback: not all storms stir up enough static...
...bowl-shaped antenna which beams the outgoing radio pulses, catches the echo...
...scope" for short), radar's screen, which is a cathode-ray tube such as is used in television. The most common type, the "Plan Position Indicator," is a circular dial with an electronic beam like a minute hand, which sweeps around the dial in synchronization with the scanning antenna, painting in its fluorescent wake a picture of what radar sees...
Navigational radio . . . is usually equipped with a shielded loop-type antenna to cope with just such static...