The RX-77 unit in question is hidden in the attic, over the master bed. It's worked fine till I fired up the Radiora stuff. Now it works so so. I took a freq counter today and can see 418mhz pop up every time I used a Radiora swich or a tabletop unit. The marantz unit is also on the same freq. I verified that today with the counter. I played with the flasher levels going to the DSS receiver from the Niles unit and things seems to clear up. The RX-77 seems to still pulse some type of IR noise.