I think I'm almost there with using my MotoSat satellite dish to watch Direct TV, using two receivers. As Bill.satellite and others have said, you can use the old RCA receiver to located the Direct TV satellite and then switch over to the new Direct TV receiver to watch it. There are a few kinks to work out, however, that I am working through.
I was able to program the second receiver with the satellite set-up information (18 inch round dish, multi-switch function). I had a signal splitter going to BOTH receivers and every 6 seconds, the picture would go off, then back on in 6 seconds. I finally realized, I had to completely take the coaxial connections off the first RCA box as I had two boxes on at once and I think they were fighting each other. So after disconnected the first RCA receiver once the second box is up and running, after 60 seconds of so, the satellite dish automatically retracted. I did this about 4 times and always go the same result.
I was able to get hold of a nice gentleman at RF Mogul, who actually wrote the manual for the MotoSat Executive dish system. He said I need to re-program the control box, using the old RCA receiver. Get into the menu and at some place, there is section on "Stowing of dish" He said I should answer the following: 1) Stow on Power Off, should be "NO" 2) Loss of power should be changed to "NO" and 3) Should the dish be stowed with loss of AC and that should say "Stay Up." Of course, these were all good safety features to prevent you from driving away with the dish up, so I have to take precautions on this.
Hope it works. I'll try tomorrow. RF Mogul does make a new control box that will replace all this, priced at $ 895 and it uses the old satellite dish.