First off, it's IR (InfraRed), not UV.
And not all IR operates on the same frequencies. So it;s very likely that your IR repeater isn't passing the proper IR frequencies. There is one repeater -
Hot Link Pro - that has a much broader frequency range than most others, if upgrading is something you want to do. I use the Hot Link Pro and have no compatibility issues with some gear that other repeaters won't control, but not specifically your receiver. Send Marcus at Hot Link an email - he'll tell you if it will work.
That said, it may be the easiest thing is to see if Dish makes an RF remote. I did a quick Google search and found
this spendy one, which looks like it has IR emitters. Makes me think that the Dish receiver doesn't natively support RF remotes.
Good luck.
al