Which would be worse? Raising ungrounded fears about DTV technology that spook the public and delay the transition for years? Or ignoring those worries and finding out later that the system is a dog? Public TV’s engineers are divided on question of reopening the three-year-old U.S. standard for DTV transmission, a course of action championed by Sinclair Broadcast Group and now festering on the body technological. “I’m conflicted — it’s a thing that an engineer doesn’t like to be,” admits Bruce Jacobs, chief technology officer at KTCA in Twin Cities.