Basic Qualification · B-003 Station assembly, practice and safety · B-003-010-003
What are the two signal parameters presented to the user on the waterfall display (spectrogram) of a modern receiver?
- AFrequency and phase
- BPhase and bandwidth
- CBandwidth and digital mode
- DAmplitude and frequency
Correct answer: D — Amplitude and frequency. From the official ISED question bank, verified word for word.
Why
A waterfall display shows how signal strength, or amplitude, changes over time across different frequencies. The full explanation — and one for every question — is in Pro.
Practise this section
Station assembly, practice and safety is section B-003 of the Basic exam: Building a station safely: power supplies, grounding, RF exposure, lightning, feedline routing, and what a transmitter, receiver and transceiver actually do.
Drill B-003 — free, no account