I move a 3900 box from one location to another sometimes when I travel. The dish where I take the box is in a fixed location. This last weekend when I hooked up the box I had a snowy picture. I tried a new cable from the dish to the receiver and also a new cable from the receiver to the tv. Neither helped the problem. The signal strength is running around 95. To see if it could be the tv I hooked up an outside tv antenna to the tv and the picture was crystal clear. I brought the receiver home and hooked it up to the dish we use at our house and the picture was clear. Could the problem be in the dish itself at the second location?