Question

In the satellite communication, the uplinking frequency range is

• A. 0.896 to 0.901 GHz
• B. 0.420 to 0.890 GHz
• C. 5.925 to 6.425 GHz
• D. 3.7 to 4.2 GHz

Answer 1

Answer: (C)

5.925 to 6.425 GHz

Uplink frequencies are higher than the corresponding downlink frequencies in the case of satellite communication. In satellite communication, the signals have to cross the atmosphere which presents a great deal of attenuation. The higher the frequency, the more is the signal loss and more power is needed for reliable transmission. A satellite is a light-weight device which cannot support high-power transmitters on it. So, it transmits at a lower frequency (higher the frequency, higher is the transmitter power to accommodate losses) as compared to the stationary earth station which can afford to use very high-power transmitters.