What is the link margin in a system with a transmit power level of 10 W (+40 dBm), a system antenna gain of 10 dBi, a cable loss of 3 dB, a path loss of 136 dB, a receiver minimum discernable signal of -103 dBm, and a required signal-to-noise ratio of 6 dB?

Question

Accepted Answer

C. +8dB Received signal = 40 + 10 - 3 - 136 = -89 dBm. Required level = MDS + S/N = -103 + 6 = -97 dBm. Margin = -89 - (-97) = +8 dB.