Basic Qualification · B-008 Interference and suppression · B-008-003-003
If your transmitter sends signals outside the band where it is transmitting, what is this called?
- A Transmitter chirping
- B Off-frequency emissions
- C Spurious emissions
- D Side tones
Correct answer: C — Spurious emissions. From the official ISED question bank, verified word for word.
Why
Spurious emissions are unwanted signals your transmitter sends outside its assigned band, often caused by poor filtering or circuit instability. The full explanation — and one for every question — is in Pro.
Practise this section
When things interfere: harmonics, overload, RFI to and from your station, filters, ferrites and how to fix the neighbour's TV.