In a downlink system, a satellite at a h=850 km circular orbit at fop=4 GHz operates with a transmit power of Pt=12 W and a transmitting antenna with diameter of Dt=6 m and aperture effieciency of etat=69%. Calculate the EIRP in dBW. Calculate free space path loss in dB if the elevation angle is El=45 degrees. Calculate the gain of the receiving antenna with a diameter Dr=4.5 m and aperture efficiency etar=76%. What power is received if other losses are LLother=2dB? (c=300000 k(m)/(s) , Re=6378 km)