So I am in a ATT MDU reselling Directv. I have an HR20 and was told by ATT to use an SCD-4P52W so that I can see High Definition and have dual tuners. But when I plug that destacker in, I only get only odd transponders, not even ones. I happen to have an old Sonora D575D destacker and it shows both Odd and Even. I need the SCD evidently though to see high definition but it does not appear to destack the signal at all (which is weird given the Sonora will). The light on my SCD-4P52W is green. I can't figure out what's wrong. Did ATT tell me the wrong destacker model? Is it a bad destacker? (which is what I originally thought since the Sonora worked). Some people are now saying I need a different model but nobody is sure. PLEASE HELP.