Basic Qualification · B-006 Feedlines and antenna systems · B-006-001-011
What factors determine the characteristic impedance of a coaxial transmission line?
- AThe ratio of the diameter of the outer shield to the diameter of the inner conductor
- BThe diameter of the shield and the length of the line
- CThe diameter of the shield and the frequency of the signal
- DThe frequency of the signal and the length of the line
Correct answer: A — The ratio of the diameter of the outer shield to the diameter of the inner conductor. From the official ISED question bank, verified word for word.
Why
The characteristic impedance of a coaxial cable is set by its physical build, specifically the ratio of the outer shield's diameter to the inner conductor's diameter. 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