Following up on my earlier question, I can report that the minimal PSK31
interface described in the Elecraft Application Notes actually works.
For receive, I got a stereo cable with plugs on each end, running from
the K2 speaker jack to the computer line in, and for sending a stereo
cable from the computer earphone output goes to an 8-pin mic plug with
two resistors in it, 10K and 1K, as a voltage splitter. Transmit is
keyed by vox. No isolation tranformers, no USB mic converter.
Computer is a MacBook, software is Cocoamodem, and they work just dandy,
though I'd expect any other computer-software combination to work, too.
The hardest part of it all was locating an 8-pin mic plug for sale in
the US -- Cheapham.com came through.
Peter N8MHD
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