I need some help trying to get all the birds. I have 101, 110, 119 fine. I get a zero reading for transponders on both 99(c) and 99(s) as well as 103 (s) and 103 (cb). I DO receive signals from 103 (ca). I tried fine tuning he dish (AZ and EL) and no improvement. In fact, I then lose the others...