[Elecraft] soundcard checker for SDR

[David Cutter]

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