PSN-L Email List Message
Subject: Re: sound card datalogging
From: Gordon Couger gcouger@..........
Date: Tue, 19 Jul 2005 02:15:02 -0500
You should be able to over come the low frequency problems of
sound cards by putting a mixer in the front of the final
amplifier for the sound card uses a local oscillator that was
right a the top of the sound card response and put the image
beyond the range of the sound card. The signals will be reversed
but fixing that with computer that run at today speed is no problem.
Or you can put the local oscillator above the low end roll of
the response of the sound card and digitally shave off the lower
sides band with digital filters.
Mixers like the NE 602 and it's replacement work from dc to 1
gHz. I strongly recommend Phillips mixer chips they come out of
the box wanting to work.
Mike Speed wrote:
> Okay - forget the low frequency response of my sound
> card is poor. *Is there any good datalogging software
> for a sound card?*
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