A number of times I've had the situation in digital mode where the QMX is not transmitting as expected. I immediately get concerned that something is blown. The last time this happened I connected a dummy load and went to the diagnostic screen in terminal mode and still no transmit. Only then did I think, oh, maybe transmit lockout. Sure enough, cycle the power and its back working again. I wish there was some indication on the screen for transmit lockout. I've blown so many finals in the QCX and QDX that my first thought is always something has failed.?