Basic Qualification · B-006 Feedlines and antenna systems · B-006-008-009
To lower the resonant frequency of an antenna, the operator should:
- A use smaller diameter wire
- B lengthen the transmission line
- C lengthen it
- D shorten it
Correct answer: C — lengthen it. From the official ISED question bank, verified word for word.
Why
An antenna acts like a tuning fork for radio waves, where its physical size determines the pitch, or frequency, it naturally sings. The full explanation — and one for every question — is in Pro.
Practise this section
Getting the signal out: antennas, feedlines, SWR, baluns, matching, and why antenna length depends on frequency.