SCR-270 Radar
The SCR-270 (Signal Corps Radio model 270) was one of the first operational early warning radars. It was the U.S. Army's primary long-distance radar throughout World War II and was deployed around the world. It is also known as the Pearl Harbor Radar, since it was a SCR-270 set that detected the incoming raid about half an hour before the attack 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. An upgraded version, the SCR-289, was also produced, but saw little use. All of the -270 versions were later replaced by newer microwave units after the cavity magnetron was introduced to the US during the Tizard Mission. The only early warning system of the sort to see action was the AN/CPS-1, which was available in late 1944.
Read more about SCR-270 Radar: Building of The Radar, Deployment and Incomprehension, Use of SCR-270 Radar At Pearl Harbor, Use of SCR-270 Radar Elsewhere in World War II, SCR-270s Today
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