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?
- A 60
- B 0.16
- C 0.6
- D 1.66
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: AM, FM, SSB, keying, speech processing, and the numbers behind occupied bandwidth.