Technician exam question T4A07
Subelement T4, AMATEUR RADIO PRACTICES· Group T4A
Which of the following is one of the connections required between a computer and a transceiver to operate digital modes?
- A.Computer “line out” to transceiver push-to-talk
- B.Computer “line in” to transceiver push-to-talk
- C.Computer “line in” to transceiver speaker connector (correct answer)
- D.Computer “line out” to transceiver speaker connector
WhyOne connection required between a computer and a transceiver for digital modes is the computer's "line in" to the transceiver's speaker connector. Digital mode software needs to hear the received audio, so the transceiver's speaker output connects to the computer's line-in jack, answer C. A and B both pair an audio jack with push-to-talk, a keying line, not an audio signal, which isn't how PTT is wired, and D sends the computer's outgoing audio into the transceiver's speaker output rather than its microphone or data input, backwards from what's needed.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2026-2030 NCVEC Element 2 pool (public domain); the explanation above is original writing, see our methodology.
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