R
radar (radio direction and ranging) Equipment originally designed for measuring the range and bearing of any object by means of radio waves reflected or retransmitted from the object.
In this system a pulse of RF energy was radiated from the radar and this pulse together with the reflected pulse were displayed as blips on the screen of an oscilloscope, the distance between them indicating the range. A later development used a rotating antenna synchronised with a radial time base in the oscilloscope. By using the reflected signals to intensity modulate the oscilloscope beam it was possible to give a display in the form of a map of the surrounding area with moving objects indicated on it: a long-persistence tube was generally used for ...
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