What type of packet frame is used to transmit APRS beacon data?
The correct answer is C: Unnumbered Information. What type of packet frame is used to transmit APRS beacon data is Unnumbered Information. APRS beacons use UI (Unnumbered Information) frames. For amateur radio operators, this is important for APRS operation. Understanding this helps when operating APRS.
Exam Tip
APRS beacon frame = Unnumbered Information (UI). Think 'A'PRS 'B'eacon = 'U'I frame. APRS beacons use UI (Unnumbered Information) frames. Not ACK, not Burst, not Connect - just UI.
Memory Aid
"APRS beacon frame = Unnumbered Information (UI). Think 'A'PRS 'B'eacon = 'U'I frame. APRS beacons use UI (Unnumbered Information) frames. Important for APRS operation."
Real-World Application
APRS beacon data: It's transmitted using Unnumbered Information (UI) frames. UI frames don't require acknowledgement - they're just broadcast. This is appropriate for beacons which are one-way transmissions. This is the frame type - Unnumbered Information frames are used for APRS beacons.
Key Concepts
Why Other Options Are Wrong
Option A (Acknowledgement): Incorrect. Acknowledgement frames aren't used for beacons - UI frames are used for beacons. ACK isn't for beacons.
Option B (Burst): Incorrect. Burst frames aren't used - UI frames are used for APRS beacons. Burst isn't used.
Option D (Connect): Incorrect. Connect frames aren't used for beacons - UI frames are used for beacons. Connect isn't for beacons.
题目解析
The correct answer is C: Unnumbered Information. What type of packet frame is used to transmit APRS beacon data is Unnumbered Information. APRS beacons use UI (Unnumbered Information) frames. For amateur radio operators, this is important for APRS operation. Understanding this helps when operating APRS.
考试技巧
APRS beacon frame = Unnumbered Information (UI). Think 'A'PRS 'B'eacon = 'U'I frame. APRS beacons use UI (Unnumbered Information) frames. Not ACK, not Burst, not Connect - just UI.
记忆口诀
APRS beacon frame = Unnumbered Information (UI). Think 'A'PRS 'B'eacon = 'U'I frame. APRS beacons use UI (Unnumbered Information) frames. Important for APRS operation.
实际应用示例
APRS beacon data: It's transmitted using Unnumbered Information (UI) frames. UI frames don't require acknowledgement - they're just broadcast. This is appropriate for beacons which are one-way transmissions. This is the frame type - Unnumbered Information frames are used for APRS beacons.
错误选项分析
Option A (Acknowledgement): Incorrect. Acknowledgement frames aren't used for beacons - UI frames are used for beacons. ACK isn't for beacons. Option B (Burst): Incorrect. Burst frames aren't used - UI frames are used for APRS beacons. Burst isn't used. Option D (Connect): Incorrect. Connect frames aren't used for beacons - UI frames are used for beacons. Connect isn't for beacons.
知识点
APRS beacon data, Packet frame, Unnumbered Information, UI frame
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.