Kentucky Educational Television's main channel will broadcast exclusively in HD starting Thursday, completing its digital transition.KET spokesperson Tim Bischoff says the network wanted to go HD in April, when it turned off its analog signals, but didn't have the technology to do so."We didn't have all of the equipment in house that we required to be able to broadcast 24/7," he says.But now, KET-1 will broadcast in high-definition signals all day. Bischoff says the switch is the last large-scale update for some time."I'm not sure what the step beyond it would even be. I'm sure one day somebody will invent 3-d or smell-o-vision or something like that, but we're not to that point," he says.KET had previously broadcast HD programs during prime time on its KET-HD channel. It will now become the Kentucky Channel 24-hours-a-day and broadcast only locally-produced programs.