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In a system of broadcasting the conditions under which there is freedom from interference depend upon the characteristics of receivers in use and upon the frequency allocation and power of transmitters. The characteristics of American broadcast receivers now in use have been investigated to determine the permissible input and frequency separation for freedom from cross talk, heterodyne beats, and flutter effects. Seven types of interference are described separately in the data on the susceptibility of present receivers to each type. Finally there are given quantitative conclusions and specifications covering the relations between signal input, frequency separation, and receiver performance.