Basic Qualification · B-003 Station assembly, practice and safety · B-003-002-004
How is the oscillator in the FM transmitter different from oscillators in AM, CW, and SSB transmitters?
- A The modulator alters its frequency
- B It runs at much higher frequencies
- C It has higher fidelity
- D The modulator changes its output amplitude
Correct answer: A — The modulator alters its frequency. From the official ISED question bank, verified word for word.
Why
In an FM transmitter, the modulator directly changes the frequency of the oscillator to carry the voice or data signal, which is why "The modulator alters its frequency" is the correct description. The full explanation — and one for every question — is in Pro.
Practise this section
Building a station safely: power supplies, grounding, RF exposure, lightning, feedline routing, and what a transmitter, receiver and transceiver actually do.