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?
- ATo filter out spurious emissions from the oscillator
- BTo prevent load changes from shifting the oscillator's frequency
- CTo shape the oscillator waveform to prevent key clicks
- DTo 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
Station assembly, practice and safety is section B-003 of the Basic exam: Building a station safely: power supplies, grounding, RF exposure, lightning, feedline routing, and what a transmitter, receiver and transceiver actually do.
Drill B-003 — free, no account