Question
What type of packet frame is used to transmit APRS beacon data?
Answer Options
- A) Acknowledgement
- B) Burst
- C) Unnumbered Information
- D) Connect
Correct Answer: C
Explanation
APRS beacon data (location, weather, status, etc.) is designed to be transmitted continuously and received by any station within range, without requiring a direct, established link (a ‘connection’) with any single receiver. This makes the system efficient and effective for broadcasting real-time data to multiple listeners simultaneously.
APRS typically uses an Unnumbered Information (UI) packet frame. In the AX.25 protocol, UI frames are broadcast packets that do not require an acknowledgement (ACK) from the receiving station. This absence of acknowledgment is perfect for APRS, as it prioritizes immediate data broadcasting over guaranteed, point-to-point delivery, allowing for continuous, real-time tracking.
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