Orbital debris objects with sizes of 6 mm and larger were detected when they passed through the main beam of the high-power, 12.6-cm wavelength radar at the Arecibo Observatory. The number of objects detected at altitudes below 1000 km in the size range of 6 mm to 2 cm agreed with orbital debris model predictions to better than a factor of two. Radar detections of larger orbital debris (10-cm diameter and above) were also compared with the objects in the U. S. Space Command catalog (the cataloged objects have UHF radar cross-sections larger than 0.01 m2). This experiment demonstrated that the large, Earth-based radar telescopes normally used for planetary studies can provide useful data about the near-Earth orbital debris populations. ¿ American Geophysical Union 1992