The task of experimental investigation of some synchronous chaotic communication systems in order to compare their qualitative and energy features is formulated and solved in this paper. The first of investigated systems was а receiver—transmitter device with additive mixing of an informative component to a chaotic carrying signal, second — а device with nonlinear injecting о informative component into the source of chaotic oscillations, third — a structure of communication combining the additive mixing at the transmitting side and synchronous chaotic response at the receiving side. For objective comparison of obtained results the systems being analyzed were realized on a basis of the same radiophysic model of autogenerator with three-dimensional phase space. 
The physical experiments have shown that under the condition of confidential transmitting of analogous signals for the first two kinds of the systems а quality of signal restored in their receivers is nearly same. However the use of a nontrivial approach in combining the additive mixing informative component at the transmitting side and the synchronous chaotic response at the receiving side allows to improve essentially a quality of informative component being restored and to increase an enegy potential of the communication channel.