Feasibility of the high-frequency modulator development is considered. The modulator is developed based on the system of circuits with nonlinear coupling. Results of computer simulation are presented with the ferrite as nonlinear element. Spiral MCG is used as a source of high currents. Performed simulation showed that these devices allow to obtain high-frequency current fluctuations in the frequency range from 40 MHz to 900 MHz. Performed comparison with the experimental results demonstrated rather good correlation between them.