Basic Qualification · B-003 Station assembly, practice and safety · B-003-006-004
Dans un émetteur à bande latérale unique de conception typique, à quelle fréquence le filtre de bande latérale est-il accordé?
- AÀ des fréquences audio
- BPrès de la fréquence de l'oscillateur RF fixe
- CÀ la fréquence de l'oscillateur à fréquence variable
- DPrès de la fréquence d'opération
Correct answer: B — Près de la fréquence de l'oscillateur RF fixe. Question tirée de la banque officielle d'ISDE.
Why
The sideband filter in a single-sideband transmitter is tuned near the fixed RF oscillator frequency because the filter must select the desired sideband while the signal is still at a low, constant intermediate frequency before being shifted to the final operating frequency. The full explanation — and one for every question — is in Pro.
Practise this section
Station assembly, practice and safety is section B-003 of the Basic exam: Building a station safely: power supplies, grounding, RF exposure, lightning, feedline routing, and what a transmitter, receiver and transceiver actually do.
Drill B-003 — free, no account