WPTD 16 Dayton, OH.

[NN2E]

This isn't exactly an un-ID but, this may help some of you in the future...

DTV 16 WPTD Dayton, OH (PBS) doesn't put their call letters in their PSIP.

The Zenith DTT-901 box displayed the following...

16-1, "16 HD"
16-2, "16 AGN"
16-3, "16 LIFE"
16-4, "16 OHIO"

If this is what you find, you've got WPTD.

73, Ed NN2E
Owner / Operator - Murphy's Law Test Site & Thunderstorm Proving Grounds

[Robert Grant]

In addition to that, if you get this 16 briefly, and don't get a chance to see a PSIP at all, you can recognize WPTD by its "ThinkTV" bug in the lower right on all four of its streams.