I came across this in Elektor which folk might want to try with their sound
cards.
Go the www.elektor.com site and log on as a new user, which will allow you
to download quite a few articles free, after which you have to pay. Find
the June 2007 issue and then the SDR Soundcard Tester article. The SDR
article is in the previous issue. You will need to install some software to
display the results. The article points to I2PHD but there seem to be
several about.
It's just a 15kHz 555 oscillator with 2 r/c outputs of opposite phase.
These are applied to the sound input of your pc which will then display the
results to determine whether anti-aliasing filters are
required/satisfactory.
It looks fun.
David
G3UNA
ps no pecuniary interest
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