1. All Hx and HRx seried DirecTV HD receivers use the same IR codeset as default, so any model chosen in the lineup will work your unit if your specific model isn't listed.
2. Make sure your satellite receiver is set to "IR" and NOT "RF" mode for remote control. this camn be checked and changed by going to menu/parental control, fav and system setup/setup/remote/ir-rf mode and selecting "IR" following the onscreen instructions.
3. Make sure the IR teather cable provided with your slingbox is plugged in and located infront of the satellite receivers IR sensor window.