>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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