could it be the headset?
I did some additional troubleshooting. The passenger headset is working, I get a side tone and can hear it in the pilot headset. It just takes a little louder effort to get it to pick up sound. My wife has always had trouble with her voice getting picked up so when she couldn't hear me on the intercom, I figured it was an intercom problem since I couldn't hear her either. It's a cheap headset.
However, my DRE 6000 ANR gets no sidetone and no sound to the passenger headset. When I tried it in both sides, I got the same result.
My conclusion is that the DRE 6000 is the problem. It is confusing to me why it will transmit to other aircraft and tower, but not to passenger. I plan to borrow a neighbors headset to test my conclusion re: the DRE. I know that it is a cheap ANR headset, but how or where can it be fixed if I'm correct? I think I heard that DRE went out of business. If I'm correct and it's the headset, the old adage "you get what you pay for" must be true. Any suggestions.....other than buying a good pair of headsets? I plan to do that right after I raise the money for my hangar door. thanks in advance. Jack