Basic Qualification · B-006 Feedlines and antenna systems · B-006-013-005
What is the approximate length of a delta loop antenna designed for 28.7 MHz?
- A10.66 metres
- B3.55 metres
- C8.15 metres
- D4.98 metres
Correct answer: A — 10.66 metres. From the official ISED question bank, verified word for word.
Why
A delta loop is a full-wavelength antenna shaped like a triangle, so you find its total wire length by dividing 300 by the frequency in megahertz. 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