TOM,

I have set up a whole lot of Dish/Denon systems and for the past 5 years never been able to get a dish remote to control a Denon. I think you are out of luck. You could teach your Dish codes into the Denon remote and try that. Some Dish RF boxes will/can receive IR if the box is set to receive IR you will need to reprogram the eeprom on your info page to set IR not RF iF your box is RF. Can't remember is a 4900 is RF????! I used a model 5000 dish RF box and used a Dish 2800 IR remote to control it without any problems.