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It is also known as the Pearl Harbor Radar, since it was an SCR-270 set that detected the incoming raid about 45 minutes before the 7 December 1941, attack on Pearl Harbor commenced. Two versions were produced, the mobile SCR-270, and the fixed SCR-271 which used the same electronics but used an antenna with somewhat greater resolution.
The initial announcement of the attack on Pearl Harbor was made by the White House Press Secretary, Stephen Early, at 2:22 p.m. Eastern time (8:52 a.m. Hawaiian time): "The Japanese have attacked Pearl Harbor from the air and all naval and military activities on the island of Oahu, principal American base in the Hawaiian islands."