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This paper presents an efficient technique of continuous communication channel's experimental research for identification of amplitude-frequency characteristics (AFC). The technique is based on Volterra model and founded on the application of the approximating method of identification of nonlinear dynamic system. The identification is carried out by means of compiling the linear combinations of responses from researched system to the test polyharmonic signals with different amplitudes. Designed firmware, realizing the methodology of identification, is used for construction of informational model of communication channel in the form of first and second orders AFC's on the basis of input-output experiment's data, using harmonic and biharmonic test signals.