Might as well throw in 3 of my senses, or maybe just 3 cents.
Most would ask why would you even want to do this? You are out in the middle of the woods with 4 tents and 4 receivers, or some other temporary setup - Katrina just came through. Or maybe just to expand the mine.
I tend to agree with Smith, P, but not completely.
Providing you don't have any signal loss and the receiver has no issues, you should be able to split an LNBF signal to multiple receivers without any affect, provided all receivers are either using Odd transponders, or Even transponders. It shouldn't have to be the same transponder, just the same polarity.
The splitters should be rated for 950 - 1450 MHz.
On the splitters.... DC Pass on one or multiple? I think either would work. But on the blocking, only the "passing" port would be able to change the polarity, while the "blocked" port would not. So if all passed, each receiver could change the available transponders and affect what the others are watching.
DishPro LNBF's are DiSEqC (2.0?) compatible, but are also backwards compatible (13V/18V), so they should also work. In fact, if the splitters are rated for 950 - 2150, in theory each receiver should be able to independently use Odd or Even transponders since the polarities are bandstacked (Odd = 950-1450; Even = 1650-2150). But then the splitters would have to be rated 950 - 2150 MHz. (And the receivers would have to be able to use bandstacked signals.)
I think a switch would probably be a cost effective investment.
But if you are in an older residence that has been prewired for cable using a combination of splitters instead of the cables running from a distribution point, and not looking to invest in re-cabling the home/townhome/condo/apt/etc..., have a couple of extra receivers that you want to give a little flexibility to the bedrooms, then I think it would work if there is no signal loss. (Caution: Also, older cable pre-wires may be using RG-59 cable, as well as splitters that are rated upto about 1000 MHz (i.e., 50 - 1000 MHz) and may not give you the signal you'll be looking for).
As SP said, try it.
Edit: PS - But don't do it as a professional install for someone else, unless they have a basketball goal to put another receiver!
