What signals are used in a computer-radio interference for digital mode operation?

• A. Receive audio, transmit audio, and transmitter keying
• B. Video signals, audio signals, and data signals
• C. Morse code signals and analog signals
• D. Only transmit audio

Answer: (A)

The correct choice highlights that receive audio, transmit audio, and transmitter keying are key signals involved in computer-radio interference for digital mode operation.

In digital mode operation, especially in amateur radio, the interaction between the computer and radio equipment relies on audio signals to transmit and receive data. The transmit audio represents the digital signals being sent from the computer to the radio through audio frequencies, while the receive audio encompasses the audio signals coming back from the radio to the computer. Transmitter keying is critical as it controls when the transmitter is turned on and off, which is essential for ensuring that signals are properly transmitted without causing unnecessary interference.

These elements work together to facilitate smooth data communication, and any malfunction or interference in these signals can lead to errors and degraded performance in digital communications. Thus, the combination of these signals directly addresses the concerns of computer-radio interference during digital mode operation, making it the most relevant and comprehensive answer to the question.