Maybe I'm using the term mirroring wrong. The dish tech kept referring to it as mirroring.
I have 1 cable connected to the dish. It goes into the camper and connects to a triplexer behind the receiver. There are 3 cables coming out of the triplexer. One goes into SAT 1 Input and the other cable goes into SAT 2 Input on the receiver. I understood him as referring to that as mirroring. One dish cable feeding two receiver inputs. I do not use the 3rd cable on the triplexer. I have TV 2 connected directly to the receiver TV 2 output.
I can't get any signal out of SAT 2 of the triplexer. I can adjust the dish to get a signal strength of 50+ on SAT 1 but SAT 2 doesn't even recognize the dish is connected. I changed triplexers with a newer style from the house system and had no joy. He was saying my MP1 dish will not feed both outputs of the triplexer. I question that being accurate. How does the triplexer know what dish is connected to it? His next sentence was "We can upgrade you to Hopper". Throughout the whole conversation, all he wanted to do is upgrade me to Hopper.
This use to work in my house, but with a different dish.