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What was the first active communication satellite?

• Telstar-1

• Syncom-3

• AST SpaceMobile BlueWalker-3

• Sputnik-1

Answer explanation

Telstar-1, launched in 1962, was the first active communication satellite, paving the way for modern satellite communication technologies. Slide 6.

Which orbit type is best suited for providing communication services in the Arctic region?

• Low Earth Orbit (LEO)

• Medium Earth Orbit (MEO)

• Geostationary Orbit (GEO)

• Molniya Orbit

Answer explanation

Molniya orbits are ideal for Arctic communication because they cover high-latitude areas that GEO satellites cannot efficiently reach. Slide 8.

What was a key feature of the Syncom-3 satellite?

• It was the first satellite to use inter-satellite links.

• It was the first geostationary satellite.

• It operated in the Ka-band frequency range.

• it provided broadband internet for smartphones.

Answer explanation

Syncom-3, launched in 1964, was the first satellite to achieve geostationary orbit and provided live television coverage of the 1964 Tokyo Olympics. Slide 7.

Why are phased array antennas advantageous for satellite communication terminals?

• They are less expensive than parabolic antennas.

• They eliminate the need for frequent handovers between beams.

• They have no moving parts, enabling rapid beam steering.

• They are specifically designed for GEO satellites.

Answer explanation

Phased array antennas allow near-instantaneous handovers without interruption, making them suitable for advanced satellite systems. Slide 33.

What was significant about the AST SpaceMobile BlueWalker-3 satellite?

• It used liquid crystal antennas for enhanced signal transmission.

• It supported direct communication with unmodified smartphones.

• It had the highest throughput among all satellites.

• It provided coverage exclusively to polar regions.

Answer explanation

The AST SpaceMobile BlueWalker-3 enabled direct communication with unmodified smartphones, marking a significant innovation in satellite communication. Slide 60.