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Why not have two types of transponders, one that is always on like lojack for planes and one that is only on for planes in the air. As long as there is some inf
by malandrew 13y ago
Why not have two types of transponders, one that is always on like lojack for planes and one that is only on for planes in the air. As long as there is some information being sent that determines what kind of signal it is, it should be trivial to have a radar system that filters out those only broadcasting their always on system.