Basic Qualification · B-008 Interference and suppression · B-008-003-008
What should you do if you learn your transmitter is producing key clicks?
- AUse a choke in the RF power output
- BCheck the keying filter and the functioning of later stages
- CAdjust your key
- DRegulate the oscillator supply voltage
Correct answer: B — Check the keying filter and the functioning of later stages. From the official ISED question bank, verified word for word.
Why
Key clicks happen when your Morse code signal turns on or off too sharply, creating a burst of unwanted noise that spreads across many frequencies. The full explanation — and one for every question — is in Pro.
Practise this section
Interference and suppression is section B-008 of the Basic exam: When things interfere: harmonics, overload, RFI to and from your station, filters, ferrites and how to fix the neighbour's TV.
Drill B-008 — free, no account