Maybe a ground loop?
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OK, I found a pretty good solution. I bought a little powered switching box that takes 2 RCA inputs and has 4 RCA outputs (not a cheap one, about $80 from a company called RF Link), sent the Dish audio output into the box, and the output to my amp, and there is dead silence now with the Dish box connected.
But with the TV itself run into the box, there was still a bit of noise, so I didn't connect the TV.
But I'm happy now.
Another vote for a ground loop issue. I have had my (various) Dish receivers hooked to my stereo for years and have never had any issues you speak of.
I have also used the digital out on the back of my Dish receiver and ran it to my DAC. The sound was a touch better, but nothing spectacular; I was using it for the satellite radio stations and they are compressed.
I have had this same experience when directly connecting the audio out (L&R) from an aging 301 receiver. The condition was not appairent at first but presented itself after years of operation. After a little trial and error I found that it was an internal ground loop due to aging components in the Dish Receiver. The telling tell was that hum was present even if the Dish receiver was completely disconnected from everything. The moment I plugged in the interconnect cables from the intergrated amp into the Dish receiver, the hum was back.
I solved the problem by going to a new Dish 211k receiver with an optical output. As Brianmgrarcom said, the sound is better/acceptable, but not spectacular.
I had the same problem - cable box RCAs or TV RCAs into my integrated amp caused a hum. Much more apparent on the input I used, but still present regardless of the input I used.
The cause was/is different ground points being used for the cable wire and my system (aka ground loop?).
I got a Jensen Cable TV RF Isolator. Zero noise now. Costed about $60.
Googling it, I just saw on the website that it says "This unit will not work with satellite systems."
I'd imagine their are ones available for satellite systems. Also as has been mentioned, use an optical connection if you can. This is the driving force behind optical, as there's no electrical signal being passed.