Basic Qualification · B-008 Interference and suppression · B-008-001-004
What type of filter should be connected to a TV receiver as the first step in trying to prevent receiver overload from an amateur radio HF transmission?
- A High-pass
- B Low-pass
- C Band-pass
- D AC line filter
Correct answer: A — High-pass. From the official ISED question bank, verified word for word.
Why
A high-pass filter blocks low frequencies while letting high ones through, which is exactly what a television needs to stop strong amateur radio HF signals from overloading its front end. 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.