Being 69 and just learning about some of this, I have this Question. I have a 1000.2 dish with 110,119 and 129 and a 500 dish with 61.5 for local HD and while watching channel 139 TBS ball game on Sunday they change from the 61.5 to the 129 which makes the picture not come in. Why do they do this and can you switch back to 61.5 yourself?