Basic Qualification · B-003 Station assembly, practice and safety · B-003-015-010
A digital protocol implements automatic repeat request (ARQ). What does it permit?
- A Error correction
- B Unattended operation
- C Error detection
- D Automatic link establishment
Correct answer: A — Error correction. From the official ISED question bank, verified word for word.
Why
Automatic repeat request, or ARQ, lets a digital system ask for a message to be sent again when it arrives with mistakes, which effectively fixes the error so the data is perfect. The full explanation — and one for every question — is in Pro.
Practise this section
Building a station safely: power supplies, grounding, RF exposure, lightning, feedline routing, and what a transmitter, receiver and transceiver actually do.