Advanced Qualification · A-005 Transmitters, modulation and processing · A-005-005-009
When using some deviation meters, it is important to know:
- A modulation index
- B modulating frequency
- C pass-band of the IF filter
- D modulating frequency and the modulation index
Correct answer: D — modulating frequency and the modulation index. From the official ISED question bank, verified word for word.
Why
Some deviation meters calculate how much the carrier frequency swings by using a formula that requires both the modulating frequency and the modulation index. 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.