Bobkat gave you the answer to your questions.
I might add that some satellites may have similar transponder frequencies and S/R (or close) and when you see a green signal and quality you might think that you are on the right satellite when you are not.
What I recommend is that once you get a signal and quality on one transponder, try to change to another transponder and see if you still get a green signal and quality as well. If not, then there is a chance you are indeed on the wrong satellite.
Good luck...
