DISH 4700 series receivers have always supported IR, RF or BOTH at the same time. I am not sure about the 6000 series since we have not seen these in the Atlanta Echostar Warehouse yet. I would think that it will also support BOTH since this was an extremely touchy subject on the 4000 (it only supported RF). The 4700 is a dream since it does BOTH at the same time (unlike SONY which is an OR). This allows a universal remote to control the theater and the RF to work through walls from another location when you are not sitting down for serious viewing!

FYI, 4720, 4722 & 6022 are SYSTEM Model Numbers that include a Dish 500, dual LNBFs (either individual or integrated) and a switch to change which satellite it is looking at (etither external or integrated).

As far as the RTI (manufacturers of the Lexicon 700T RF), the RF is proprietary and simply sends a command address to the main box mounted near your equipment. This is then translated to an IR command and sent to the equipments IR sensor or port. ALL RF remotes that I am aware of operate the same way. NONE use the RF commands of DISH, SONY or RCA.

I suggest to retire your 4000 to another room or the mechanical room and modulate it elsewhere. The 4700 series offers Dolby Digital and the 6000 offers fully integrated HDTV. BTW, the DISH Network HDTV kills DSS. Better picture, more programming choices and a fully integrated menu for ease of use.