Basic Qualification · B-006 Feedlines and antenna systems · B-006-013-005
Quelle est la longueur approximative d'une antenne à boucle delta syntonisée à 28,7 MHz?
- A3,55 mètres
- B8,15 mètres
- C4,98 mètres
- D10,66 mètres
Correct answer: D — 10,66 mètres. Question tirée de la banque officielle d'ISDE.
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