Image: ASR-9 Radar Antenna
ASR-9_Radar_Antenna.jpg (349 × 275 pixels, file size: 67 KB, MIME type: image/jpeg)
Description: The antenna system of an Airport Surveillance Radar-9 with primary radar (parabolic antenna) and secondary radar (rectangular antenna, top). The secondary radar interrogates the transponder on the aircraft, which sends back a coded signal indentifying the craft and giving its altitude.
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