Basic Qualification · B-006 Feedlines and antenna systems · B-006-004-008
Selon quelle valeur exprime-t-on les pertes RF dans les lignes de transmission?
- AEn décibels par unité de longueur
- BEn ohms par MHz
- CEn décibels par MHz
- DEn ohms par mètre
Correct answer: A — En décibels par unité de longueur. Question tirée de la banque officielle d'ISDE.
Why
RF transmission line losses are expressed as Decibel per unit length because signal strength drops as the wave travels along the cable, and this drop is measured in decibels for every specific distance, such as per metre or per hundred feet. 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