BasicB-003-007-002
Which of the following is a function of the sound card interface in a station operating computer-based digital modes?
D
Answer
Basic radio theory
Type
A
To convert the analog signal from the computer into a digital signal that can be transmitted
B
To amplify the digital signals to be sent by the transceiver
C
To demodulate the transmitted signal
D
To convert the digital signal from the computer into an audio signal that can be transmitted
Answer Notes
The core function of a computer's sound card in amateur radio digital modes is to act as a digital-to-analog and analog-to-digital converter. When preparing to transmit, the digital mode software generates a digital stream of data. The sound card converts this digital data into an analog audio signal (such as AFSK tones).
This analog audio is then fed into the transceiver's microphone or accessory input to be transmitted over the air. The sound card does not amplify digital signals for the transceiver, nor does it deal with RF; its job is strictly to bridge the gap between the computer's digital domain and the radio's analog audio domain.
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Which of the following is a function of the sound card interface in a station operating computer-based digital modes?
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Which of the following is one function of most sound card interfaces in a station operating computer-based digital modes?