Larry, I think you can get an adaptor kit from Channel Master. Try O'Rourke Bros. out of Chicago. If you put in any of those dishes with the multiswitch in the neck of the dish, though, expanding to Sat C might just buy you a garden ornament.

Eslob is mostly right.

Sat C basically adds channels to the Sat B input to an HD (and maybe ParaTodos) receiver. A regular (2 gHz)splitter is used to combine the Sat C LNB signal with the 18V signal coming from the SAT B LNB; downstream the wiring is a regular HD setup. It also looks to the naked eye like it is a regular LNB. Oh yeah -- I put up a dish that came with three LNBs, and you could use any one for A or B or C, so they are all the same.

I'm not sure what Eslob means by "big dish type." Ten foot C-band?

I set up a non-HD Sony receiver, and it had a choice for two LNBs or three, so I think there are some non-HD signals coming from it. Again, maybe ParaTodos.

On the Sonys, you have to tell it that you have all three LNBs. How did the Hughes and Mitsu receivers lock up? Is there a place to choose the third LNB? I have not had any problem with any generation of DSS receivers (again, mostly Sony) dealing with any generation of LNB signal. I happen to have a five year old Sony on an HD dish with all three LNBs, with not problem. Of course, it does not see the channels that could come to it from LNB B and C because it does not have the 22 kHz tone to choose them because that was not used when it was made..........