Hi everyone, I am a little puzzle with this phenomenon when I run Winrad, may be someone or Alberto can help explain it. My setup is pretty basic, a generic soundcard (running at 48KSPS) with a AD9951 DDS driving a SDR hardware design by YU1LM (74HC4053 + 74AC74). Reception is great with Alberto's software, however, I notice instead of getting the full 48KHz bandwidth I was getting only 24 KHz -i.e., right side of the spectrum is just a mirror image of the left side. Identical signal can be seen at both +F and -F position relative to center of the spectral window. I though using this I/Q detection you can differentiate positive from negative frequencies (relative to frequency zero), am I wrong? Thanks! de D.J. /NM3R
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