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?
- ASignal loss increases as the length increases
- BSignal loss decreases as the length increases
- CSignal loss is the least when the length is the same as the signal's wavelength
- DSignal 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
Feedlines and antenna systems is section B-006 of the Basic exam: Getting the signal out: antennas, feedlines, SWR, baluns, matching, and why antenna length depends on frequency.
Drill B-006 — free, no account