The orbital speed of long shoaling waves and the modulation of centimetric wind-generated waves by the shoaling waves were obtained from the frequency and amplitude modulations, respectively, of the backscattered signal of a coherent CW 9.375-GHz radar operated from the end of a pier on the Outer Banks of North Carolina. Modulations anomalously large in comparison with those predicted by the relaxation time model (Keller and Wright, 1975) were observed in the range of wind speeds 4.5--6.5 ms-1, which was perhaps coincidentally near the shallow water wave speed. Outside this range of wind speeds the model qualitatively accounted for the magnitude and wind speed dependence of the measured modulations. The phase of the modulation leads to the inference that the maximum amplitude of the short waves occurs near, and generally leeward of, the crests of long waves for wind speeds of up to 8 ms-1, the highest wind speed encountered in the experiment.