writes:

At this point, it doesn't do anything more than mode C.

The assigned mode S code is currently not being programmed into the
transponder, and the controller still doesn't get your tail number
until you give it to him.

Where did you get that? Programming the FAA assigned mode S code was
part of my installation, and I'm told part of every GTX330 installation
at the shop I went (Avionics West).

-jav