Basic Qualification · B-003 Station assembly, practice and safety · B-003-006-004
In a typical single-sideband transmitter, at what frequency is the sideband filter tuned?
- A At audio frequencies
- B Near the fixed RF oscillator frequency
- C At the VFO frequency
- D Near the operating frequency
Correct answer: B — Near the fixed RF oscillator frequency. From the official ISED question bank, verified word for word.
Why
The sideband filter in a single-sideband transmitter is tuned near the fixed RF oscillator frequency because the filter must select the desired sideband while the signal is still at a low, constant intermediate frequency before being shifted to the final operating frequency. 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.