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The untold Pearl Harbor radar story

机译：不为人知的珍珠港雷达故事

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Ever wonder what happened to the radar set that detected the Japanese aircraft before the raid on Pearl Harbor? This article reveals the fate of that SCR-270 radar set; describes some of the radar development background; and includes typical results of a World War II command, control and communications system that used the SCR-270 as its backbone radar. The SCR-270 was a radio-echo detection and direction finding set for locating aircraft. It operated by transmitting a short-duration pulse of high frequency radio waves, which would be reflected or re-radiated by any metallic or conducting surface within the field of the directive transmitting antenna; therefore, one or more aircraft within the antenna field appeared as a source of reflected radio waves. Rotating the antenna which also served as the receiving antenna, provided a means for determining the azimuth or direction of aircraft. The system measured the time it took a blip or reflected return from the target to appear on a cathode ray tube indicator, to give the distance or range to the detected aircraft. The maximum range of the radar was about 250 miles up to 50,000 feet under all atmospheric conditions including rain, mist, smoke or fog, and during daylight or darkness. The azimuth and range data supplied by the set permitted the plotting of the location of detected aircraft on maps. Major performance characteristics of the radar are provided in the included table
机译：有没有想过在袭击珍珠港之前发现日本飞机的雷达组发生了什么事？本文揭示了SCR-270雷达装置的命运。描述一些雷达的发展背景；包括使用SCR-270作为骨干雷达的第二次世界大战指挥，控制和通信系统的典型结果。 SCR-270是用于飞机定位的无线电回波检测和定向装置。它通过发射短时的高频无线电波脉冲进行操作，该脉冲会被定向发射天线场内的任何金属或导电表面反射或再辐射；因此，天线场内的一架或多架飞机似乎是反射无线电波的来源。旋转也用作接收天线的天线，提供了一种确定飞机方位角或方向的装置。该系统测量了从目标发出的瞬息或反射回波出现在阴极射线管指示器上所花费的时间，以提供到检测到的飞机的距离或范围。在包括雨，雾，烟或雾在内的所有大气条件下，以及在白天或黑暗期间，雷达的最大范围约为250英里（最高50,000英尺）。该设备组提供的方位角和距离数据允许在地图上绘制检测到的飞机的位置。随附的表格中提供了雷达的主要性能特征

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