Basic Qualification · B-003 Station assembly, practice and safety · B-003-007-003
Which of the following is one function of most sound card interfaces in a station operating computer-based digital modes?
- A Display the transmit frequency
- B Translate the digital signal into alphanumeric characters
- C Modulate the received signal
- D Switch the transceiver between receive and transmit modes
Correct answer: D — Switch the transceiver between receive and transmit modes. From the official ISED question bank, verified word for word.
Why
Most sound card interfaces handle the audio for digital modes, but they also send a control signal to your radio to flip the switch between listening and talking. 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.