I found a link to this post about a Dirt Simple PSK31 sound card interface cable. However, the link was dead. I'm reposting the article I found on the wayback machine so that it can still be found online easier by other Ham Operators.
Also found a pretty cool website for the various sounds the different modes make. http://www.w1hkj.com/FldigiHelp-3.21/Modes/
Setting up an FT-897D for PSK31
Dirt Simple, Dirt Cheap
Digital Mode Interface
For the FT-817
Can it really be THIS simple?!? Yes, I built a Digital
Interface for the FT-817 for almost no cost and
almost no effort! As you can see from the photo,
the entire interface is built on the Xmit/Rcv switch.
I am using this with DigiPan II, but it should work
with virtually any soundcard software for PSK,
and for other digital modes also!
The Windows volume and recording levels are
used to set transmit and waterfall (receive) drive
levels, but a trimmer is also included to adjust the
transmit drive. A standard Windows Mouse plug
fits the FT-817 data port, I used a cable cut from
an old mouse! This interface does require you to
manually switch between transmit and receive,
but does not require ANY connection to the PC’s
USB or Serial Port!
Direct any questions to John, N6HI.qrp@gmail.com
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