Basic Qualification · B-006 Feedlines and antenna systems · B-006-010-010
Pourquoi utilise-t-on souvent une bobine de charge avec une antenne HF verticale mobile?
- APour filtrer le bruit électrique
- BPour annuler la réactance capacitive
- CPour diminuer les pertes
- DPour diminuer le facteur Q
Correct answer: B — Pour annuler la réactance capacitive. Question tirée de la banque officielle d'ISDE.
Why
A short mobile vertical antenna acts like a capacitor because it is too small to be a full wave, creating capacitive reactance that blocks efficient power transfer. 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