Basic Qualification · B-008 Interference and suppression · B-008-004-003
Why are harmonic emissions from an amateur radio station not wanted?
- AThey may result in excessive power dissipation
- BThey may overload a nearby transmitter
- CThey may interfere with stations on adjacent frequencies
- DThey may cause interference to other stations
Correct answer: D — They may cause interference to other stations. From the official ISED question bank, verified word for word.
Why
Harmonic emissions are extra signals your transmitter creates at multiples of your chosen frequency, and they are unwanted because they may cause interference to other stations operating on those different 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