BasicB-003-007-001
Which of the following is a function of the sound card interface in a station operating computer-based digital modes?
B
Answer
Basic radio theory
Type
A
To amplify the digital signals to be sent by the transceiver
B
To convert the received analog audio signal from the transceiver into a digital signal for the computer
C
To demodulate the transmitted signal
D
To convert the received digital signal from the transceiver into an analog signal for the computer
Answer Notes
In computer-based digital modes like FT8, PSK31, or RTTY, the transceiver receives an RF signal and demodulates it into standard analog audio. However, a computer processor can only work with digital data (ones and zeros). The sound card acts as an Analog-to-Digital Converter (ADC), taking that analog audio from the radio and digitizing it so the digital mode software can decode the message.
When transmitting, the process reverses: the sound card acts as a Digital-to-Analog Converter (DAC), turning the computer's digital payload into analog audio tones that the radio can transmit. The sound card never interacts directly with RF or amplifies digital transmission signals.
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In a single-sideband transmitter, which stage transposes the voice message from the audio spectrum to the radio spectrum?
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Which of the following is a function of the sound card interface in a station operating computer-based digital modes?