I'm still not 100% following you. But it sounds to me like you are trying to split the cable that comes from your sat dish by connecting it to a splitter that used to be used to split cable television to various outlets in your house (i.e. the splitter that you'll find in that grey box on the side of your house).
If that is the case, you'll have at least a couple problems.
1) That splitter probably isn't rated/designed to pass the frequencies required for your satellite receiver - they normally are labled with a frequency range on the splitter. Satellite frequencies are different than cable.
2) You can't split a single satellite dish's cable using an ordinary splitter. Your receivers will go nuts with that scenario even if it did handle the frequency range. When you run "slave" receivers, you actually connect the line from your dish directly to the main reciever, and then run a cable back out the "loop" connector on the back. You then connect that to your slave receiver.
I know "very little" about this FTA stuff so far, so there are probably other issues that I'm not aware of (or maybe I'm completely off base, but these are two issues that I'm figuring are going to cause you troubles right off the bat)