Eu am aceeasi configuratie, adica DM800 + H-H DM3800 si folosesc un LNB Inverto Single Black Ultra, imi merge perfect setand astfel:

Meniu > Setup > Service Searching > Tuner Configuration > Tuner A >

Configuration mode: Simple
Mode: Positioner

Si desigur am introdus coordonatele pt. locatia mea si merge super.