BasicB-003-007-004
Which of the following is a function of the sound card interface in a station operating computer-based digital modes?
C
Answer
Basic radio theory
Type
A
To provide radio frequency coupling between a computer and a transceiver
B
To amplify the digital signals to be sent by the transceiver
C
To provide audio frequency coupling between a computer and a transceiver
D
To demodulate the transmitted signal
Answer Notes
A sound card interface connects the audio output of the computer to the audio input of the transceiver, and vice versa. It strictly deals with Audio Frequency (AF) signals, coupling them safely between the two devices so they can exchange data tones.
It is important to differentiate between Audio Frequency (AF) and Radio Frequency (RF). The sound card interface never handles RF; the transceiver takes the AF from the sound card and modulates it onto an RF carrier. Therefore, any option suggesting RF coupling or digital amplification is incorrect.
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Which of the following is one function of most sound card interfaces in a station operating computer-based digital modes?
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Why are isolation transformers often included in the sound card interface of a station operating computer-based digital modes?