I just received the DQT1000 Digital QAM transcoder and I am feeding in two off air encrypted signals. I get a FIFO OVERFLOW message, what gives?

When you select the QAM mode, you will see several selections including QAM-256A and QAM-256B The A suffix indicates ITU-A or DVB compliant FEC and the B suffix indicates ITU-B or DigiCipher II FEC encoding. Selecting QAM256A with DigiCipher signals will result in the above error message. Another possibility is that the unit is set to QAM-64B instead of QAM-256B.