The PSK004 card provides both coherent and non-coherent BPSK modulation at subcarrier frequencies tunable from 1 KHz to 15 MHz. It occupies a single ISA Bus card slot and is programmed through ISA Bus port transfers.

The PSK004 card accepts data in NRZ (L/M/S) or BiPhase (L/M/S) formats at rates up to 1 Mbps. The input data can optionally be encoded to NRZ (M/S) prior to subcarrier modulation. All user selectable options are software controllable over the ISABus.