Advanced Qualification · A-005 Transmitters, modulation and processing · A-005-005-003
Quel est le facteur d'excursion ("deviation ratio") d'un émetteur FM en phonie ayant une excursion maximale de fréquence de plus ou moins 5 kHz et dont la fréquence modulante maximale est de 3 kHz?
- A0,16
- B0,6
- C1,66
- D60
Correct answer: C — 1,66. Question tirée de la banque officielle d'ISDE.
Why
The deviation ratio is found by dividing the maximum frequency swing by the highest modulation rate. The full explanation — and one for every question — is in Pro.
Practise this section
Transmitters, modulation and processing is section A-005 of the Advanced exam: Transmitters, modulation and processing: AM, FM, SSB, keying, speech processing, and the numbers behind occupied bandwidth.
Drill A-005 — free, no account