Alinco DX-SR8T Digital Mode Interface

I’m interested in getting into the digital modes more in ham radio, particularly on HF. Aside from a few purpose-built devices, like the PACTOR modems, most of the time digital modes use the sound card in your computer.

Generally, the hook up goes something like this:

    • Connect the speaker output of the computer to the mic input of the radio
    • Connect the speaker output of the radio to the mic input of the computer
    • Figure out some way to trigger the Push to Talk (PTT) on the radio so that it transmits the audio being sent from the computer.

The first two parts can be sort of easy, depending on the what connectors you have. Some computers have separate phone jacks for both audio in and out and some radios have the same. In that case, you get a cable, plug the audio out from one into the audio in from the other and vice versa.

However, that was not the case for me. I had to build an interface.

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