Dish and Comcast Internet on same Coaxial Cable

Recently I had the Disk Network Hopper and 3 Joeys installed at my house. The joey in my computer room shares a cable with my Comcast cable internet service. I never had a problem running my satellite tv and cable internet through the same coaxial cable until now. Prior to switching to Disk Network, I had Directv and it worked fine sharing a coaxial cable with my Comcast cable internet. I had a 5/2150 2-way splitter combining the signals at the junction box on the outside of my home and another 5/2150 2-way splitter separating it at the outlet in my computer room.

The Disk Network technician tried this same hook up using 2 Holland 5/2150 HFS-2D splitters and it does not work. The satellite signal comes through fine, but the cable internet will not work. When I connect it with using the old splitters that worked when I had Directv, which is an Aska 5-2150 Diplexer on the combining end and a Holland DPD2 5-2150 on the splitter end, the Comcast internet signal comes through fine, but the satellite does not work.

I would really like to run the satellite and cable internet through the same coaxial cable. Do I need a special signal combiner/splitter?

Any help is greatly appreciated.

If this is not the proper forum for this post, please let me know.