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SESK: Stuff Everyone Should Know · sesk.info/ham-digital-interface-signals

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

Receive audio, transmit audio and transmitter keying.

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  1. Receive audio, transmit audio and transmitter keying ✔
  2. Antenna and RF power
  3. Mode status and location data

Why: The interface carries the radio's received audio to the computer, the computer's audio to the radio, and a signal that keys the transmitter.

Huh, didn't know that: Many newer radios carry all three signals over a single USB cable.

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My radio interface has three jobs: listen, talk and push the button.
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References

Answer: Receive audio, transmit audio and transmitter keying. The interface carries the radio's received audio to the computer, the computer's audio to the radio, and a signal that keys the transmitter.

  1. HamStudy 2026 Technician pool, T4A06 hamstudy.org/browse/E2_2026/T4A
    Receive audio, transmit audio, and transmitter keying
    Checked 2026-10-09.

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