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The objective of the project was a search, analysis and selection of RF devices that have potential to be used to generate chaotic oscillations and that already have mathematical models that demonstrate low-dimensional chaotic behavior. The last property potentially enables to construct the symbolic description of chaotic trajectories. The performed search and analysis show that among potential candidates traveling-wave tube (TWT) and chaotic oscillator based on microtriode are more suitable for our purposes. Chosen models are investigated as for existence of low-dimensional chaotic modes. The possibility of symbolic' description of a trajectory, through construction of a quasi-one- dimensional map is studied for values of parameters corresponding to low- dimensional chaotic modes. It is shown how the symbolic description can be constructed, both for the model of TWT and for the model of chaotic oscillator based on microtriode.