[hpsdr] More Janus results

[Larry Taft]

Phil, 

The plots look great.  What happens when you put in a signal at 0 dBm?  
Or maybe a bit lower?  Time to dig out the low noise xtal oscillator 
from the back shelf.

I am impressed.  Time for a pre preliminary production run to satiate us 
widebanders.

73, Larry  K2LT

Phil Harman wrote:
> ***** High Performance Software Defined Radio Discussion List *****
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> I've now completed testing the prototype Janus board at both 96k and 
> 192k and the results are very good.
>  
> This image is at 96kHz  (Janus 96.jpg)
>  
> *http://www.hamsdr.com/personaldirectory.aspx?id=351*
>  
> and this at 192kHz (Janus 192k.jpg)
>  
> *http://www.hamsdr.com/personaldirectory.aspx?id=352*
>  
> What is really pleasing is at 192k there is no sign of the 48k clock 
> feeding the TLV320 Codec which was a problem with my breadboard. The 
> total lack of spurs is a credit to Lyle's PCB layout skills!
>  
> By using the automatic calibration function on the AK5394A chip I've 
> also been able to reduce the DC offset by a futher 10dB.
>  
> All the other Janus board functions check out OK so looks like we have 
> a 100% functional Alpha PCB.
>  
> 73's Phil...VK6APH
>  
>  
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