when i try to check freq for cartoon network hd on 28.2E (12324v 29500) i cant get a lock on this , yet on a strong tp say channel 4 , im getting 100% without moving the dish . im recieving channels at 4 hops , but surely this wont affect signal ? could it be an lnb problem ? as i have only had lnb on about 1 year . thanks for any help.