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

The signals used in a computer-radio interface for digital mode operation primarily involve receive audio, transmit audio, and transmitter keying.

In digital modes, the computer typically sends digital data signals that need to be transformed into audio frequency signals for transmission by the radio. This is achieved through transmit audio, which acts as the output from the computer going to the radio's microphone input. Meanwhile, receive audio is the signal coming from the radio to the computer, allowing the computer to decode incoming information.

Transmitter keying is crucial because it controls when the radio is transmitting. It ensures that the radio only sends out signals when digital data is being sent. This is essential for avoiding confusion on the frequency and ensuring that transmissions occur only during the intended times.

Overall, these three functions work together to facilitate effective digital communication between the computer and the radio in amateur radio operations.