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?
- ADisplay the transmit frequency
- BTranslate the digital signal into alphanumeric characters
- CModulate the received signal
- DSwitch 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
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