Basic Qualification · B-008 Interference and suppression · B-008-001-005
During a club Field Day outing, reception on the 20-metre SSB station is compromised every time the 20-metre CW station is on the air. What might cause such interference?
- A Receiver desensitization
- B Both stations are fed from the same generator
- C Improper station grounding
- D Harmonic emission
Correct answer: A — Receiver desensitization. From the official ISED question bank, verified word for word.
Why
When a strong nearby signal hits your receiver, it can overload the front end and temporarily block weaker signals you are trying to hear, a problem called receiver desensitization. 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.