QuestenaUn entraînement qui indique quoi revoir ensuite
RechercheCréer un test
Question 197

How close to the lower edge of a band’s phone segment should your displayed carrier frequency be when using 3 kHz wide LSB?

  1. At least 3 kHz above the edge of the segmentBonne réponse
  2. At least 3 kHz below the edge of the segment
  3. At least 1 kHz below the edge of the segment
  4. At least 1 kHz above the edge of the segment

Explication

With LSB the occupied spectrum lies entirely below the displayed carrier frequency, so to keep a 3 kHz wide signal inside the segment the displayed frequency must sit at least 3 kHz above the lower edge. Setting it at or below the edge would put the sideband outside the segment even though the display reads inside it.

Continuer avec ce test

Commencer l’entraînement
Comprendre ce thème (≈7 min)Retour au test
Question 197: How close to the lower edge of a band’s phone segment… · FCC General Class (Element 3) · Questena