When I connect IBU a Sat Finder immediately gets noisy even while LNB is on the ground. When I connect Inverto C120 or GI-209P using the same cable there is no noise coming from Sat Finder. I was thinking maybe a cable conductor is not long enough for LNB connectors to make a proper connection? Either that or devices are broken but I refuse to believe that 2 new devices could be broken...
Have you actually put one of the new LNB's on the dish and tested it using a satellite receiver ?