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?
- A Excess transmission line heating
- B Excess RF loss in the transmission line
- C Excess reflections at the antenna feed point
- D Excess 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
Getting the signal out: antennas, feedlines, SWR, baluns, matching, and why antenna length depends on frequency.