As far as I am aware all dual polarisation LNB's have a supply voltage of 13v and 18v dc. Its the voltage supplied to the LNB by the receiver that selects between vertical and horizontal polarisation. 13v = vertical polarisation and 18v = horizontal polarisation. (">
Just the fact that some geniuses were laughed at does not imply that all who are laughed at are geniuses. They laughed at Columbus, they laughed at Fulton, they laughed at the Wright brothers. But they also laughed at Bozo the Clown.