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This paper presents general design data for a complete radio relay transmission system. All parameters are shown in graphs either as gain or attenuation figures (decibels). From these figures, either a level diagram may be plotted or the final signal-tonoise ratio may be obtained by simple addition or subtraction of the respective parameters. In order to get realistic figures for various modulation systems, a new parameter has been defined which accounts for the deficiency of the demodulator. Numerical examples are presented to show the convenience in practical use.