The satallite approach transmitter is an RCO for PIT. They use it for Clearance Delivery when the tower is closed (2100-0700L). Usually they'll turn it on when the tower goes home and leave it on all night which is pretty fun to listen to.
The tower is 100% student run with FPL controllers providing OJT instruction. LC is priority on the scanner, and LC and GC share the same feed.