The Blonder Tongue AP-60-860A (Agile Digital/Analog Processor) operates in one of the three following modes: Mode 1: Analog Heterodyne Processor (Analog RF IN > Analog RF OUT) Mode 2: Digital Heterodyne Processor (QAM IN > QAM OUT) Mode 3: Digital-to-Analog Processor (8VSB or QAM IN > Analog RF OUT)