I just replaced my BSC-421 on my 7.5 footer with the new C-2 that I just got. The 30--0--30 markings are oriented differently on the 2 LNBFs. So I looked down each one's "throat" and the probes are in the exact same place with respect to the box on the outside -not the 30--0--30 marks. So, I installed the new one oriented the same way the old (421) was, disregarding the marking,and I got nothing on the 4DTV 'till I selected "Rotated 90" in the menu. The 30--0--30 on the old 421 was lined up with the "0" on the north-south axis of the dish and it worked without rotated 90 selected. I'm confused, since the probes inside are aligned the same as the old one was. They should both be the same, no?