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Dependence of the Availability of Radio Channels on the Threshold Level of Man-made Interferences

The problem of increasing the efficiency of data transmission over a HF radio channel with bands of 3-24 kHz was studied. There were developed techniques and algorithms for estimating the occupancy of a radio channel by processing sounding data on the noise level in the HF band for adapting a digital HF communication system. Dependences of the availability of radio channels on the threshold level of man-made interferences were obtained.