*Question E2D08:
What type of packet frame is used to transmit APRS beacon data?*  

*Correct Answer is  C: Unnumbered Information*  

### AI Response: (may contain errors)  

To understand the type of packet frame used to transmit APRS (Automatic Packet Reporting System) beacon data, let's break down the correct answer and the other options.

### Correct Answer: C - Unnumbered Information

- **Unnumbered Information (UI)** frames are used in APRS to send short, one-way messages without the need for acknowledgment. This is ideal for beaconing, where the goal is to continuously send location and status information without waiting for a response.
- APRS beacons typically include information such as the station's position, status, and other telemetry data, which fits the characteristics of UI frames.

### Why the Other Choices are Incorrect:

- **A: Acknowledgement**
  - Acknowledgment frames are used to confirm receipt of a message. Since APRS beacons are sent as one-way transmissions, they do not require acknowledgment, making this option incorrect.

- **B: Burst**
  - Burst frames are typically used in time-sensitive applications where multiple packets are sent in quick succession. While APRS can send multiple packets, the standard beacon transmission does not specifically use burst frames, so this option is not applicable.

- **D: Connect**
  - Connect frames are used to establish a connection between two stations, which is not the case for APRS beacons. APRS operates on a one-to-many basis, broadcasting information rather than establishing a direct connection.

### Summary

- **APRS beacons** use **Unnumbered Information (UI)** frames for efficient, one-way communication.
- Other frame types like Acknowledgment, Burst, and Connect do not fit the operational model of APRS beaconing.

This understanding of packet frame types is crucial for the Extra Class exam, especially in the context of digital communications and APRS operations.