Advanced Qualification · A-007 Feedlines and matching · A-007-001-009
Quel avantage a l'adaptateur "pi-L" sur l'adaptateur "pi" pour accorder l'impédance entre un amplificateur linéaire à tube à vide et une antenne multibande?
- AUne plus grande gamme de transformation
- BUne plus grande suppression d'harmoniques
- CUn rendement plus élevé
- DMoins de pertes
Correct answer: B — Une plus grande suppression d'harmoniques. Question tirée de la banque officielle d'ISDE.
Why
A pi-L network adds an extra inductor and capacitor to the standard pi-network, creating a steeper filter that blocks unwanted harmonic frequencies more effectively before they reach the antenna. The full explanation — and one for every question — is in Pro.
Practise this section
Feedlines and matching is section A-007 of the Advanced exam: Feedlines and matching at the advanced level: transmission line theory, impedance transformation, stubs and matching networks.
Drill A-007 — free, no account