In the case of assymetry parameter of the electric field gradient (h і 0.2) for NQR (spin of nuclei I=1) there exists a three nonequidistant energy levels. The transition in this system could not be excited with the help of only one transmitting channel. Low frequency radio band (< 10 MHz) influence much the quality of the two frequency experiments. These experiments were successfully carried out in nuclear of ¹⁴N in sodium nitrat NaNO₂ and b -HMX C₄H₈N₈O₈. The aim of these experiments was to find out the optimum series for identification in NQR spectrum and the observation of superposition signals in NQR of ¹⁴N. At the same time the calculation of the observed signals were made with the help of B.C.Sanctuary method. Thus it had been shown, for instance, that during action of two-frequency two pairs pulses, the deviation of one the two resonance frequencies causes the change of signal phase on second frequency . The calculation by the method of multipole spherical tensor method of B.C. Sanctuary showed the presense of the superposition signals. The influence of frequency offset on other transition shows the presence of superposition signal. The multifrequency experiments with multipulse sequence show it more obviously.The usage of two-frequency action in multipulse series allowed to find out the features of the formation of the signal in NQR .

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