A lot of difficult and confusing information here. Even wa8yxm says my post is wrong and then exactly describes what I said needs to be done as the correct way.
You CAN use the existing coax cable to power your satellite receiver but you CANNOT do that if that cable first runs to the cable input on the back of your Sensar Pro (or standard wall plate).
It just takes a simple A/B switch to modify the connection and allow that one cable to handle both purposes but it does require a modification.