My PBS contact here in Houston says they have no 'switch', the HD content is direct from national. They will insert a fresh HD program whenever it is available/scheduled. I whined about them not showing NOVA in HD and he said the locals can't screw up and miss an HD show, 'cause the HD broadcast is always hooked up to national. According to the schedule he pointed me to the next HD event is 10:30 EDT 21 Oct. Mattise and Picasso....
TerryB
TerryB