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A transmitter has an output power of 150W. It is connected to its antenna by a feedline that is 15m long and properly matched. The loss in the feedline is 1.5 dB / 100m. The antenna has a gain of 6.5 dBi. What is the power density 1 km from the antenna, in the direction of maximum gain, assuming free space propagation?
A certain antenna has a gain of 10 dB with respect to an isotropic radiator. What is its effective area if it operates at 300MHz?
A certain antenna has a gain of 7 dB with respect to an isotropic radiator. What is its effective area if it operates at 200MHz?