Basic Qualification · B-008 Interference and suppression · B-008-003-002
If someone tells you that signals from your hand-held transceiver are interfering with other signals on a frequency near yours, what could be the cause?
- AYour hand-held has a chirp due to low battery voltage
- BYour hand-held offset is wrong
- CYour hand-held is transmitting spurious emissions
- DYou need to reduce your output power
Correct answer: C — Your hand-held is transmitting spurious emissions. From the official ISED question bank, verified word for word.
Why
Spurious emissions are unwanted radio signals your transmitter accidentally sends out on frequencies other than the one you selected. 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