I frequently have to do that, but sometimes I get away without it. I have two motorized dishes, and if I want to swap receivers, I park both dishes on 87W ( my true south ) . Then , I turn off the boxes, switch cables, and see how they work. More often than not, both dishes work fine. Sometimes , though, I have to initialize the stb driving the SG2100, and reset the motor, too.
Never happens with the STAB motor, I think because of the absolute encoder that it has. The STAB just keeps on chugging, no matter which USALS box is driving it.
Hope this helps.
