Some mathematical models of the input signals in an adaptive telemetring system are developed for the purpose of the redundancy reduction of the measuring data or the “volume information reduction”, i.e., for the construction of systems with data compression. In the model, the signals from 250 airship telemetering elements, divided into six blocks, are processed following the signals activity. The application of the model for the measuring data flow allowed increasing the number of measurement channels at the existing transmission capacity of an optical channel (25Мbit\s) for the “Agat” series by a factor of 1.7-2.