OK, problem solved. There were two issues I was dealing with. The sound, and the lack of (DD) showing in the channel/program info window when it is opened. Apparently, contrary to what I was told by the techs, it does not appear when receiving 5.1 broadcasts. All that shows is (HD)(CC)(Stereo).
Here is what happened. It took a bit of mental detective work to figure it out. My wife and I were away for several weeks. Our grown daughter, who lives at home with us dropped the Logitech universal remote and it broke. I'm the only one in the household that is able to use the three remotes to change video and sound between off air, satellite, and the DVD/Blue Ray. I tried to explain to her over the phone how to do it. There are several buttons on the Harman Kardan AVR for sound output. I use "tape" for the over the air television reception, video 2 for the satellite, and dvd for the disc player.
Here's the rub. There is an optical cable from the TV to the AVR for the off air antenna audio. However, when watching DBS (the satellite feed), the HMDI cable which connects the DISH receiver to the tv sends audio as well as video. The speakers on the television are turned off. When the tv speakers are turned off, the audio is fed through the tv to the AVR, but not in 5.1. Our daughter must have clicked on the tape audio button and got sound, but not in Dolby. It was still digital which showed on the display of the AVR. We've had the universal remote for several years, so I didn't have to switch the AVR to the satellite audio feed when we changed the programming sources. Since it was producing audio, I didn't think about how the wiring had been installed, until some posted that the AVR was the likely culprit.
Thanks to the posters pointing me to the AVR, I started fiddling around with the AVR. When I switched from "tape" to Vid 2, the speaker display lit up, and voila, the output was, once again, in 5.1 surround sound.
In the spirit of full disclosure, I have to admit that I am embarassed, and I debated about posting that which revealed I am an electronic doofus, and reacted innappropriately to my interaction with DISH support. I wasn't rude or abusive with them, but I did make a pest of myself.
Thanks to all, Tom