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Assuming a 900MHz transmit antenna with 39dBm ERIP is placed 100m away from a train tunnel entrance measuring 20sqm (cross sectional. Also assume a free space propagation from the antenna right to the tunnel opening.
What is the received signal strength inside the tunnel, at x meter away from the tunnel entrance ? assuming 0dBi receive antenna.
What is the received signal strength inside the tunnel, at x meter away from the tunnel entrance ? assuming 0dBi receive antenna.