USB-UIRT Forum

Any ideas on why a 1/8" emitter cable would suddenly stop working? The usb-uirt box works fine and will transmit the IR signal perfectly, but any time I plug the emitter cable into the 1/8" jack I get nothing. I've tested 5 different remote emitters and none of them work. This setup was working flawlessly a few days ago...

I've also tested 3 different usb-uirt boxes, and all of them are having the same issue. I've got to be missing something simple.

Thanks in advance!