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SESK: Stuff Everyone Should Know · sesk.info/ham-line-in-speaker

Which is a required connection between a computer and a transceiver for digital modes?

Computer line in to the transceiver speaker connector.

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  1. Computer line out to the transceiver push-to-talk
  2. Computer line in to the transceiver speaker connector ✔
  3. Computer line out to the transceiver speaker connector

Why: The computer has to hear what the radio receives. So the radio's speaker audio goes into the computer's line in, where software decodes it.

Huh, didn't know that: The opposite path, from computer line out to the radio's audio input, carries the transmit audio.

The dad joke
Line in, line out. My radio desk has more lines than a theme park.
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References

Answer: Computer line in to the transceiver speaker connector. The computer has to hear what the radio receives. So the radio's speaker audio goes into the computer's line in, where software decodes it.

  1. HamStudy 2026 Technician pool, T4A07 hamstudy.org/browse/E2_2026/T4A
    Computer “line in” to transceiver speaker connector
    Checked 2026-10-09.

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