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In this case SEAMCAT calculates the receiver attenuation a_VLR(Df) to be applied to the interfering signal by using the following expression (see Figure 109105):

                        Attenuation (Df) = block_{Protection Ratio}(Df) (dB) + C/(N+I) (dB) + (N+I)/N (dB) – I/N (dB)     (Eq. 24)

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                        iRSS_blocking = Interfering Signal Level (f it ) = -54.5 - 59 = -113.5 dBm