Basic Qualification · B-006 Feedlines and antenna systems · B-006-004-001
What is the major adverse consequence of using RG-58 coaxial cable for a transmission line operating on the 70 cm band?
- AExcess transmission line heating
- BExcess RF loss in the transmission line
- CExcess reflections at the antenna feed point
- DExcess RF radiation from the transmission line
Correct answer: B — Excess RF loss in the transmission line. From the official ISED question bank, verified word for word.
Why
RG-58 coaxial cable is quite thin, and as radio frequency gets higher, such as on the 70 cm band, the signal struggles to travel through it without losing energy. 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