Advanced Qualification · A-005 Transmitters, modulation and processing · A-005-006-010
Three important parameters to be verified in an FM transmitter are:
- A distortion, bandwidth and sideband power
- B modulation, pre-emphasis and carrier suppression
- C frequency stability, de-emphasis and linearity
- D power, frequency deviation and frequency stability
Correct answer: D — power, frequency deviation and frequency stability. From the official ISED question bank, verified word for word.
Why
You must check an FM transmitter's output power to ensure it stays within legal limits, its frequency deviation to confirm the signal swings the correct amount for clear audio, and its frequency stability so the station does not drift off its assigned channel. 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.