Is there anything I can use the General Instrument DSR-4200V for? Or am I better off jsut taking it out of my configuration?
The 4200V, being Digicipher II and not DVB, would require activation for the particular service you are trying to receive. Considering this is at a school, it was probably used to receive one of a handful of PBS channels that were at one time uplinked using Digicipher II. The PBS channels are now DVB and DVB-S2. Honestly, the 4200V is next to useless.
You would get nice PBS coverage if you were to aim the Ku-Band dish at 125W and connect a DVB-S2 receiver to it. Looking at the pictures, you probably have a single-polarity LNB on that dish, so to get everything on both polarities you'd want to upgrade the LNB.