I've only seen one "size". Sorry about non-thumnail, but
to the left is a regular OLD RS TV splitter, the type I've used for years without a problem. At center is a DC-block, also, the type found at RS, if you're lucky. To the right is a satellite rated splitter. I actually kind of prefer the regular splitter with the DC-block, because the satellite types seem to be diode types, which I think tend to have a minimum voltage that you must exceed before they pass anything. I *THINK* that the DC-block is just a capacitor, although I've never opened one up.
Anyway, you can just power the dish with the analog receiver, and use the "T" with DC-block to give signal to your FTA receiver.
You can do that, however it's still preferred to use a DC-block. It will eliminate the "T" though. Your dish will then be powered by the FTA receiver, and the only issue is that if you've specified a vertical transponder, then the LNB will only get 13V, and some big dish LNBs don't work well at 13V. So what I do in that case, is lie to the receiver and tell it that all transponders are horizontal.
