We have close to the same unit. Your satellite connection will not go straight to the Weingard audio/video switch. On my coach, the cabinet above the driver's seat contains the Weingard switch. Behind the switch, against the bulk head, there are two cable connections. One connection should say Satellite In and the other Satellite Out. Connect a coax cable from the Satellite In connection to your Dish receiver and then connect the output from the Dish receiver to the Satellite Out connector. Now, the satellite signal will run from the antenna, through the receiver to the switch, where you can then select the different inputs to go to your TV, etc.
The problem with this setup is that the entire A/V circuitry in our coaches was designed before HD transmissions and TV's switch to all digital input. Our systems use RG6 cable connections between all the devices, where today, HDMI is the "standard" connection technology.
Wayne Lee
Out West Somewhere
2016 Forest River Sunseeker 3050DS Class C | Hummer H3 dinghy