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On the funnier side...

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Actually, they do have IFF, but they call it a transponder. Mode 3A & 3C are sub-components of military IFF (which has a number of additional modes which provide more info)

Mode 4=IFF
Mode 5c= alt

We also had provisions for modes 1 and 2 but I don't remember the details. Hit a mode 4 equiped aircraft with the right interogation code and it would respond back with a proper code and bloomers on the radar display.
 
This thread isn't on the funnier side anymore. As far as transponders go, I turn it on with some numbers dialed in before I leave. If Atc says it's not working, I turn the other one on.
 

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