Deep Dive: E2D07
The correct answer is C: AX.25. What digital protocol is used by APRS is AX.25. APRS uses the AX.25 packet radio protocol. For amateur radio operators, this is important for APRS operation. Understanding this helps when operating APRS.
Why Other Answers Are Wrong
Option A (PACTOR): Incorrect. PACTOR isn't used by APRS - APRS uses AX.25. PACTOR isn't the protocol. Option B (QAM): Incorrect. QAM isn't a packet protocol - APRS uses AX.25 packet protocol. QAM isn't the protocol. Option D (AMTOR): Incorrect. AMTOR isn't used by APRS - APRS uses AX.25. AMTOR isn't the protocol.
Exam Tip
APRS protocol = AX.25. Think 'A'PRS = 'A'X.25. APRS uses the AX.25 packet radio protocol. Not PACTOR, not QAM, not AMTOR - just AX.25.
Memory Aid
APRS protocol = AX.25. Think 'A'PRS = 'A'X.25. APRS uses the AX.25 packet radio protocol. Important for APRS operation.
Real-World Example
APRS (Automatic Packet Reporting System): It uses the AX.25 digital protocol. AX.25 is a packet radio protocol based on X.25. APRS packets are formatted according to AX.25. This is the protocol - AX.25 is used by APRS.
Source & Coverage
Question Pool: 2024-2028 Question Pool
Subelement: E2D
Reference: 2024-2028 Question Pool · E2 - Operating Procedures
Key Concepts
Verified Content
Question from the official FCC Extra Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the E2D topic.