Bobby,
That was the model of mine. My study of the internet demonstrated to me that mine no longer functioned properly (on DISH) because of DISH programming that no longer was compatible with identifying of the satellite (the communications between the DISH receiver and the King Dome box). This explanation made sense as my dish suddenly decided it couldn't find the satellites.
I believed what I read and decided that I'd bite the bullet, get a "real" dish and get rid of DISH and get DIRECTV. I purchased the Winegard Travel'er for DIRECTV for under $1,500 and a local guy installed it for $200 and I connected it to the new DIRECTV receivers I got from Winegard. So, total price was about $1700 for that.
Probably too much information but I wanted to explain what another owner, me, did when suddenly my dish no longer functioned. As far as I know DIRECTV standard definition still works on that specific model so that's my guess as to what you're using.
Mike