Our DTV transmitter has been experiencing many odd problems lately. We have the "top guy" from the manufacture here to diagnose the problems. The frame was bent when shiped so we are performing a complete mechanical and electrical alignment. We found the combining network (allows the 10 solid state amplifiers to combine into the single transmission line) has been overheating. This burnt the line causing many of the amplifiers to shut down in a self-protect mode.
The analog transmitters are also finicky, but viewers at home rarely see the problems. WOWT, KETV, and KMTV all have dual transmitters at the 72nd street facility. If one transitter experinces problems, the engineers transfer over to the other system. If problems occur with the transmission line or antenna, all three stations also have back-ups at their original towers located downtown. It is extremely nice for stations in Omaha to have three analog transmitters.
I'll look into the web notice for DTV broadcasting.