I am under the impression that Turbo QPSK encoding is useless for seeing anything other than ITC/FTE Dish Network.
If this is not so, please set me straight.
IIRC Fox occasionally uses turbo QPSK for some occasional feeds. Trouble is finding them to begin with. Without a blind scan box that can look for them, your SOL to confirm the STB is able, let alone the tuner hardware.