Basic Qualification · B-007 Radio wave propagation · B-007-007-001
Quelle couche ionosphérique affecte plus particulièrement les communications faites par ondes de ciel sur la bande de 6 mètres?
- ALa couche
- BLa couche E
- CLa couche F2
- DLa couche F1
Correct answer: B — La couche E. Question tirée de la banque officielle d'ISDE.
Why
The E region, a layer of the ionosphere located about 100 kilometres up, is the primary reflector for 6-metre band signals during sporadic E events, which are sudden bursts of ionization that allow these waves to bounce back to Earth over long distances. 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