Basic Qualification · B-003 Station assembly, practice and safety · B-003-004-003
In a basic CW transmitter, why is the oscillator followed by a driver/buffer stage?
- A To filter out spurious emissions from the oscillator
- B To prevent load changes from shifting the oscillator's frequency
- C To shape the oscillator waveform to prevent key clicks
- D To filter out noise from the oscillator
Correct answer: B — To prevent load changes from shifting the oscillator's frequency. From the official ISED question bank, verified word for word.
Why
The oscillator creates the radio signal, but if you connect it directly to the next stage, the changing electrical demand from that stage pulls the frequency off tune. 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.