Basic Qualification · B-003 Station assembly, practice and safety · B-003-005-003
In an SSB/CW receiver, what is the purpose of the mixer?
- A Convert the beat frequency oscillator signal to audio
- B Provide USB and LSB signals for sideband selection
- C Remove the carrier from the received signal
- D Convert the received signal into the intermediate frequency
Correct answer: D — Convert the received signal into the intermediate frequency. From the official ISED question bank, verified word for word.
Why
The mixer combines the incoming radio signal with a local oscillator signal to shift the frequency down to a fixed intermediate frequency, which is easier for the rest of the receiver to process clearly. 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.