LF: 9kHz: soundcard RX

[Horst Stöcker <horst.stoecker@web.de>]

>And what about a simple band pass filter to supress the 50Hz and it's 
>harmonics? Necessary or dispensable?

You can hear (!) the difference. I just took a 10mH coil from Reichelt to 
improve my soundcard-RX before one of the last SAQ activities.

Despite of more or less excellent digital filtering of SpecLab it's a good 
idea. One should not keep the soundcard busy with unwanted signals.

What I am not sure about is the use of an audio transformer. It might have some 
influence to the signal. As it just has to keep the soundcard from beeing blown 
it might be a good idea to take a cheap soundcard instead of the audio 
transformer - and maybe a second in spare.

Stefan, what USB-soundcard you bought for 10 EUR ?

Horst DO1KHS
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