Question
What is the purpose of digital store-and-forward functions on an amateur radio satellite?
Answer Options
- A) To upload operational software for the transponder
- B) To delay download of telemetry between satellites
- C) To hold digital messages in the satellite for later download
- D) To relay messages between satellites
Correct Answer: C
Explanation
In addition to real-time transponders, many digital amateur satellites offer store-and-forward capability. This is particularly useful for Low Earth Orbit (LEO) satellites, as they are only visible to any single station for a short time, typically 10 to 15 minutes.
The purpose of the digital store-and-forward function is to hold digital messages (like email or files) in the satellite for later download by other ground stations. An operator can upload a message during one pass, and a station in a different part of the world, having its own pass time, can download the message later, acting as a global, non-internet-dependent messaging system.
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