A correlation spectrometer for the IRAM Plateau de Bure radio astronomy observatory is presented. It can process up to 960 MHz wide IF signals coming from the 4‐antenna connected array. An IF processor selects the frequency window of interest, both in width and central frequency. A digital correlator produces channelized amplitude and phase information for the six pairs of antennas, which is later used for aperture synthesis mapping. Some original technical features are detailed. Some improvements suggested by observing results are discussed.