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Thanks for that information John. As I see it, the FAA is helping to perpetuate the idea that Mode C transponders will go away. Maybe. Someday. Here is the FAA's FAQ on the subject: "Will Mode C transponders be required indefinitely? The FAA is considering additional changes in the...

John, Thanks for all you've done on this subject. As to a backup for ADS-B, as I understand it, the FAA's existing radar system is supposed to be the backup today, and probably for a long time. Originally, radar was supposed to go away, in order for the FAA to save money, but it can't since...