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The paper analyzes high energy concealment factor techniques for satellite communications systems by lowering the carrier frequency (to f = 100...30 MHz) is carried out. According to research experiments, fading in communication channels with diversity reception is also determined by the influence of small-scale variations of the ionospheric total electron content. A procedure is developed for calculating the dependence of the energy concealment factor on carrier frequency selection for satellite communications system using space-diversity signal reception by two antennas. The calculation procedure is based on the standard deviation of small-scale variations of the ionospheric total electron content. [ABSTRACT FROM AUTHOR]