…But in the late 1930sthe threat of air attack stimulated work on this technology, and research groups in at least eight countries—France, Germany, Italy, Japan, Netherlands, the Soviet Union, the United Kingdom, and the United States—independently developed radar. Even before the outbreak of war Britain had built an air-defense radar system called Chain Home. In the United States, researchers at MIT’s Rad Lab and the U.S Naval Research Laboratory also hurried to develop radar.
During World War II
It has been said that radar won the war for the Allies in World War II. …Most of the air (and naval) actions in World War II fought with radar at UHF and below. Early U.S. radar equipment operated at 200 MHz. The XAF and CXAM search radars were designed by the Naval Research Laboratory, and were the first operational radars in the US fleet, produced by RCA…
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