The effective technique of the experimental research of the continuous 
communication channel of a telecommunication system for identification 
of the amplitude–frequency characteristics on the basis of Volterra series 
is offered. The technique is based on the application of the interpolation 
method of the identifying nonlinear dynamic system by means of compiling 
the linear combinations of responses of researched system to the test 
polyharmonic signals with different amplitudes. The developed 
hardware–software tools implementing the technique of identification are 
applied to create an information model of the communication channel 
in the form of the first– and second–order amplitude–frequency characteristics. 
The model construction of the VHF-range radio channel is offered.