[Rokke]

Acehai, I'm flagging you back to this thread because I need someone who is on record as disagreeing with me to offer some input. Please read the last several posts and let me know if anything I've said regarding ATC radars, transponders, etc is total garbage.

[barf]

I'll ask a simple question of a simple person. How did GCA work before secondary radar came into use? I was first associated with secondary radar back when it was classified secret. But GCA went back to before that. GCA used both the elevation angle and range to locate the plane. Are you going to tell me that GCA was only fiction because primary radar can not locate an object?