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Radar is a surveillance technology that uses radio waves to determine the range (and azimuth) of an aircraft. It works by measuring the time difference between a radio transmission and the echo or reply to that transmission. Radars are the most common surveillance equipment used by ATC.

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What are magnetrons installed on aircraft used for?

that appear to be installed in most large aircraft, some examples appearing on this list: http://www.mpdcomponents.com/pdfs/FAA-PMA.pdf My understanding is that these magnetrons were the first form of radar
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