Basic Qualification · B-003 Station assembly, practice and safety · B-003-001-001
To be most effective, where should a low-pass filter be connected in an HF station without an external power amplifier?
- AAs close as possible to the transceiver output
- BBetween the SWR meter and the antenna tuner
- CBetween the antenna tuner and the antenna switch
- DAs close as possible to the antenna switch output
Correct answer: A — As close as possible to the transceiver output. From the official ISED question bank, verified word for word.
Why
A low-pass filter stops high-frequency signals from escaping your radio, and placing it as close as possible to the transceiver output ensures these unwanted signals are blocked before they travel down the cable. The full explanation — and one for every question — is in Pro.
Practise this section
Station assembly, practice and safety is section B-003 of the Basic exam: Building a station safely: power supplies, grounding, RF exposure, lightning, feedline routing, and what a transmitter, receiver and transceiver actually do.
Drill B-003 — free, no account