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Questions and Answers
What is the main function of a communications satellite?
What is the main function of a communications satellite?
- Collecting data from different locations on Earth
- Predicting natural disasters
- Relaying and amplifying radio telecommunication signals (correct)
- Monitoring weather patterns
At what altitude are many communications satellites placed to appear stationary at the same point in the sky?
At what altitude are many communications satellites placed to appear stationary at the same point in the sky?
- 40,000 miles (64,000 km) above the equator
- 22,300 miles (35,900 km) above the equator (correct)
- 5,000 miles (8,000 km) above the equator
- 10,000 miles (16,000 km) above the equator
Why are ground station satellite dish antennas aimed permanently at the spot of geostationary satellites?
Why are ground station satellite dish antennas aimed permanently at the spot of geostationary satellites?
- To receive signals from multiple satellites
- To conserve energy
- So that they do not have to move to track the satellite (correct)
- To avoid interference from other ground stations
Why do antennas on the ground in low Earth orbit satellite constellations have to follow the position of the satellites and switch between satellites frequently?
Why do antennas on the ground in low Earth orbit satellite constellations have to follow the position of the satellites and switch between satellites frequently?
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Why do communications satellites use a wide range of radio and microwave frequencies?
Why do communications satellites use a wide range of radio and microwave frequencies?
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Study Notes
Communications Satellites
- Main function: Relaying signals between ground stations
- Geostationary orbit: Altitude of 35,786 km
- Geostationary Satellites: Appear stationary in the sky from Earth's perspective
- Ground station antennas aim permanently at the spot of geostationary satellites: Because the satellite's position is fixed relative to a specific point on Earth
- Antennas on the ground in low Earth orbit satellite constellations have to follow the position of the satellites and switch between satellites frequently: Because the satellites are constantly moving in orbit
- Communications satellites use a wide range of radio and microwave frequencies: To avoid interference and allow for more efficient use of the spectrum
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