Basic Qualification · B-007 Radio wave propagation · B-007-003-001
Quel terme décrit une zone trop éloignée pour la réception des ondes de sol, mais trop rapprochée pour la réception des ondes ionosphériques?
- ALa zone d'ombre
- BLa zone de diffusion
- CLa zone de propagation
- DLa zone de silence
Correct answer: D — La zone de silence. Question tirée de la banque officielle d'ISDE.
Why
A skip zone is the silent gap where your signal cannot be heard because ground waves fade out before reaching it, while sky waves bounce off the ionosphere and land too far away. The full explanation — and one for every question — is in Pro.
Practise this section
Radio wave propagation is section B-007 of the Basic exam: How signals travel: the ionosphere and its layers, skip, ground wave, sporadic E, and which bands work when.
Drill B-007 — free, no account