Basic Qualification · B-003 Station assembly, practice and safety · B-003-017-001
You construct a simple DC power supply using a transformer, rectifier and filter capacitor. If you use the supply to power a CW transmitter, what problem with signal quality could it cause?
- A Key clicks
- B Harmonics
- C Overmodulation
- D Chirp
Correct answer: D — Chirp. From the official ISED question bank, verified word for word.
Why
Chirp happens when a transmitter's frequency wobbles slightly every time you press the key, sounding like a sliding tone. 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.