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How do radar transponders work?

Updated: 9/19/2023
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13y ago

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It works by sending out a continuous data signal, identifying the aircraft. This is picked up by equipment at the control tower and overlaid onto the radar screen. The data shows the aircraft's individual ID, it's height and speed.

Not ALL aircraft are fitted with transponders - small planes, micro-lights and hang-gliders don't normally have the equipment. They have to contact the control tower by radio, and identify their aircraft. This info is then manually inserted onto the radar image.

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Q: How do radar transponders work?
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