FIELD: radio engineering, radio transmission equipment. SUBSTANCE: antenna tuning system includes transmitting antenna, second antenna, matching unit, first and second receivers, first and second quadratic detectors, voltage divider and tuning indicator. Proposed antenna tuning system can be employed to match output of transmitter with input of transmitting antenna without radiation of electromagnetic waves into the air by transmitting antenna and in presence of external interference, jamming included. EFFECT: design of antenna tuning system demonstrating increased noise immunity and absence of radiation of electromagnetic energy into free space thanks to use of random radio noises in the capacity of exciting signal of tuning system. 1 cl, 3 dwg
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