Problem
Consider the design of a radio-controlled model airplane with a maximum range of 300 m. The receiver requires a C/N0 ratio of 47 dB-Hz. Due to poor isolation from the aircraft engine, the receiver has a noise figure of 22 dB. What EIRP would have to be transmit-ted to achieve the maximum range? Assume line-of-sight transmission at 45 MHz, and assume that transmit and receive antennas have gains of -3 dB relative to an isotropic antenna.