Basic Qualification · B-006 Feedlines and antenna systems · B-006-004-004
As the length of a transmission line is changed, what happens to signal loss?
- A Signal loss increases as the length increases
- B Signal loss decreases as the length increases
- C Signal loss is the least when the length is the same as the signal's wavelength
- D Signal loss is the same for any
Correct answer: A — Signal loss increases as the length increases. From the official ISED question bank, verified word for word.
Why
Every foot of cable you add to your antenna system absorbs a tiny bit of energy as heat, so a longer run always means more total energy lost before the signal reaches the antenna. 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.