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RA radio

D detecting

A and

R ranging == ==

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15y ago
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11y ago

The Navy began using it in WWII as an object detection system. It is an acronym for [RA]dio [D]etection [A]nd [R]anging

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12y ago

It stand for the waves that "radiate" from the transmission point

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Q: What is the origin of the word 'radio'?
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