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Kvalitet prenosa digitalnog signala od predajnog do prijemnog radio- relejnog uređaja zavisi od uticaja efekata sredine na prostiranje elektromagnetnih talasa. U ovom radu su objašnjeni i modelovani neki od najvažnijih efekata, koji su karakteristični za frekventni opseg u kome radio-relejni uređaj GRC 408E radi. Na osnovu rezultata modelovanja doneti su zaključci o kvalitetu prenosa digitalnih signala kod radio-relejnih uređaja GRC 408E., Quality transmission of digital signals from a transmitting radio-relay device to a receiving one depends on the impact of environmental effects on the propagation of electromagnetic waves. In this paper some of the most important effects are explained and modeled, especially those characteristic for the frequency range within which the GRC 408E operates. The modeling resulted in the conclusions about the quality of transmission of digital signals in the GRC 408E radio-relay equipment.