Basic Qualification · B-003 Station assembly, practice and safety · B-003-015-007
Lorsque vous choisissez une fréquence pour émettre en RTTY, quel décalage minimal (séparation) de fréquence devriez-vous respecter pour éviter de brouiller un contact en cours?
- ADe 50 Hz à 100 Hz
- BDe 3 kHz à 5 kHz
- CDe 6 kHz à 10 kHz
- DDe 250 Hz à 500 Hz
Correct answer: D — De 250 Hz à 500 Hz. Question tirée de la banque officielle d'ISDE.
Why
RTTY signals are narrow, so you only need a small gap of 250 Hz to 500 Hz between the centre of your signal and another station to avoid clashing. 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