SignalPrep
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?

  1. ADe 50 Hz à 100 Hz
  2. BDe 3 kHz à 5 kHz
  3. CDe 6 kHz à 10 kHz
  4. 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

This question in English · All B-003 questions