Question
Which of the following techniques is used by digital satellites to relay messages?
Answer Options
- A) Digipeating
- B) Store-and-forward
- C) Multisatellite relaying
- D) Node hopping
Correct Answer: B
Explanation
Digital amateur satellites employ specific techniques to facilitate message exchange, especially over long distances that exceed the limited range of a single pass. While digipeating and node hopping are techniques used in terrestrial packet radio networks, satellites use a method that accounts for their continuous global movement.
To relay messages, digital satellites primarily use a store-and-forward system. A message is uploaded from the transmitting station to the satellite’s onboard memory, where it is stored. The satellite then carries this message around the Earth until it passes over the intended receiving station, which can then download or ‘forward’ the stored message. This is highly effective for global messaging without requiring two stations to be in line-of-sight simultaneously.
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