A fully developed plane turbulent jet was investigated experimentally by means of hot‐wire anemometry and digital data analysis. Pairs of normal hot‐wire signals were digitized simultaneously and computer processed to produce autospectra, auto‐ and cross‐correlations, coherence functions, and phase spectra. The results establish that this flow does not contain regularly occurring structures. But, distinct frequency‐centered activity near 20 Hz was detected via the coherence functions, and this implies that randomly occurring large‐scale coherent structures exist within the flow. Moreover, convection velocities estimated via the corresponding phase spectra suggest that these structures move more slowly than the smaller turbulent eddies.