Radio direction-finding operator

In the early days of aviation, radio direction-finding operators helped pilots to land in bad visibility. The aircraft sent a morse signal in response to which the radio direction-finding operator rotated his antenna until he had accurately determined the direction from which the signal was coming. He reported the position to the aircraft allowing the pilot to adjust course if necessary. The job of radio direction-finding operator was eliminated with the installation of instrument landing systems
(Picture: Swiss Museum of Transport Archive)


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