Title: Reverse Drift Bursts in Radio Spectra above 1 GHz and their Relation to H ard X-Rays. Author_list: Farnik, F. and Karlicky, M. Abstract: In the study we compare radio emission of 7 flares with their hard X-ray emission. The selected flares belong to a group of flares which exhibit reverse drift bursts and, at the same time, were observed by RHESSI. These parallel observations enable us to search and describe relation between the two emissions.