[Elecraft] K2 S-meter output for antenna measurements?

[Parker Buckley]

Now that my K2 is on the air, filters aligned with
Spectrogram, etc., my thoughts return to tuning my 5 band
quad.  I have in mind picking off a voltage somewhere in the
K2 that is proportional to signal strength, feeding that to
some sort of A to D converter for my PC, then using the PC
to plot single strength around a 360 degree azimuth.
Simliar ideas have been documented in the ARRL antenna books
using VU meters and X-Y plotters, but I can't help but think
someone has done this more recently with a PC.  Can anyone
point me to such a scheme, or provide hints for wading into
this?  Thanks in advance.

Parker WD8JOL