Basic Qualification · B-008 Interference and suppression · B-008-001-002
What is one way to tell if your HF transmitter causes front-end overload interference to a neighbour's receiver?
- A Adding receiver shielding has no effect
- B Interference is heard regardless of the volume setting on the receiver
- C Adding a low-pass filter at the transmitter solves the problem
- D Transmitting on various frequencies produces similar interference
Correct answer: D — Transmitting on various frequencies produces similar interference. From the official ISED question bank, verified word for word.
Why
If your neighbour's receiver is overloaded by your transmitter, the problem happens across many frequencies because the receiver's front end is simply too sensitive to handle your strong signal, regardless of which channel you use. 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.