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?
- A Frequency and phase
- B Phase and bandwidth
- C Bandwidth and digital mode
- D Amplitude 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
Building a station safely: power supplies, grounding, RF exposure, lightning, feedline routing, and what a transmitter, receiver and transceiver actually do.