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T4A06
What signals are used in a computer-radio interface for digital mode operation?
Pick an answer to check it.
Answer: C. Receive audio, transmit audio, and transmitter keying
For digital modes, the computer needs to hear the radio, talk to the radio, and switch it to transmit. Those three signals are receive audio, transmit audio, and transmitter keying (push-to-talk).
Tip: Hear, talk, key: RX audio, TX audio, PTT.