Basic Qualification · B-003 Station assembly, practice and safety · B-003-011-003
What is the advantage of using a variable frequency oscillator in a basic CW transmitter?
- A Greater suppression of harmonics
- B Frequency is not constrained to the available crystals
- C Use of higher speed Morse code is supported
- D Greater suppression of key clicks
Correct answer: B — Frequency is not constrained to the available crystals. From the official ISED question bank, verified word for word.
Why
A variable frequency oscillator lets you tune the transmitter to any frequency within a range, whereas a crystal-controlled transmitter is locked to the specific frequency of the crystal it uses. 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.