Extra exam question E2D07
Subelement E2, OPERATING PROCEDURES· Group E2D
E2D07
What digital protocol is used by APRS?
- A.PACTOR
- B.QAM
- C.AX.25 (correct answer)
- D.AMTOR
WhyAPRS runs on the AX.25 packet radio protocol. APRS runs on top of the AX.25 packet radio protocol, using AX.25's unnumbered information frames to carry position and status data, answer C. PACTOR and AMTOR are separate HF data protocols unrelated to APRS, and QAM is a modulation scheme, not a packet-layer protocol.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2024-2028 NCVEC Element 4 pool (public domain); the explanation above is original writing, see our methodology.
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