Thanks Jimbo,
I did some investigating of the setup. 4 cables come from the old dish straight into the house in a bundle: 2 RF cables, a power cable (Red/black/ground), and a control cable (labeled pulse, etc). Right now they terminate in the living room behind the TV where they used to connect to the old receiver and power supply, not plugged into anything.
On the wall where the cables come out, there are 4 boxes screwed onto the wall: DLS Signal Combiner (in use to combine antenna & sat), DLSPro UHF/VHF amp (not used? there is only a cable at IN, not OUT)), "Channel Master" (in use, not sure what it does), a 3-way splitter, and a DLS TV/VCR distribution amp (in use). I'm not sure which of these would have been used with the big dish, or if they're all new. Also, I'm unsure how the big dish modulated signal would have been supplied to the rest of the house.
And I just looked in the water heater closet and there's a charlie foxtrot of original and new cabling in there with two 2-way splitters and two 4-way splitters... I can't get in the attic to trace them without dying thanks to the summer heat, but it looks like the one output signal from the old dish receiver comes in, gets split a bunch of times, and then goes to the rest of the house.
I wasn't here when the DTV was installed, and I didn't have much time today, so I wasn't able to draw an input/output diagram. But I should be able to do that later today.
Outside, the two DTV wires come to a Zinwell 3x4 Multiswitch with 4 outputs, all cabled even though there are only 3 receivers in the house.
I apologize for the unorganized information, but I'm only just now learning about this stuff as it becomes necessary!
Is there any easy way to trace where cables begin and terminate? Some kind of sender-receiver for each end? Hopefully an inexpensive way.
Thanks for any info!