Likely nobody, that's the problem. I bet more often than not, broadcasters are already short-staffed in their engineering departments, and throw in DTV and they're simply unable to attend to it all. They probably have to contract-out consulting and installation/maintenance services for a new transmitter equipment; I work in a comparable environment where I see that approach fall apart all the time -- i.e. the full-time technicians don't know jack about "all this new stuff" that some external supplier installed and management doesn't see why this is a problem since at least the company is "moving forward"...

*sigh* :)