That is mostly hum pickup from the AC lines and it's harmonics due to
ground loops. It's quite normal.
On Sat, 2006-09-09 at 17:27 +0000, pa0wfo wrote:
> To all .
> I,m a new member to this group . Just loaded Alberto,s SDR software
> version 0.99 and found the following problems . I hear a big signal
> modulated with my skype mike in the middle of the tuning range even
> when the convertor is not connected and there is no local osc ( in my
> case 7080,5 Khz ) present. I use a Dell PC type Dimension 8250 with a
> on board card ( Digital Soundmax Audio ).
> I wonder why DC ( 0Hz ) is such a big audible signal or is this a bug
> of my soundcard ?
> 73, William PA0WFO
>
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> Yahoo! Groups Links
>
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>
>
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>
--
Cecil
KD5NWA
www.qrpradio.com www.hpsdr.com
"Sacred Cows make the best Hamburger!" Don Seglio Batuna
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