Advanced Qualification · A-005 Transmitters, modulation and processing · A-005-005-003
What is the deviation ratio of an FM phone transmitter having a maximum frequency swing of plus or minus 5 kHz and accepting a maximum modulation rate of 3 kHz?
- A60
- B0.16
- C0.6
- D1.66
Correct answer: D — 1.66. From the official ISED question bank, verified word for word.
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