Question

A space probe is launched to explore the surface of Jupiter. It takes approximately 60 minute for the radio signal to travel from the space probe back to the Earth. The space probe is equipped with a microwave power source of 100 W and directional antenna of 45 dB gain. A large dish antenna (Earth station) operating at 3 GHz is deployed to monitor the signal coming from the probe. If the received power of the Earth station is –160 dBm, determine the diameter of the dish antenna.

Answer 1