Basic Qualification · B-006 Feedlines and antenna systems · B-006-004-010
If the operating frequency is increased, how does the transmission line loss change?
- A Loss increases, due to internal line losses
- B Loss increases, due to increased wave velocity
- C Loss decreases, due to skin effect
- D Loss decreases, due to decreased SWR
Correct answer: A — Loss increases, due to internal line losses. From the official ISED question bank, verified word for word.
Why
When you raise the operating frequency, the electrical resistance inside the cable goes up because the signal tends to flow only on the outer surface of the wire, a phenomenon called skin effect. 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.