Re: [Discuss-gnuradio] found problem with std_4rx_0tx.rbf

[Eric Blossom]

On Tue, Oct 23, 2007 at 05:16:14PM -0700, Hans Glitsch wrote:
> Hi,
> 
> There's a problem with the std_4rx_0tx.rbf in the latest release.  This 
> problem did not exist in 3.0.
> 
> Please see the attached image.  All four inputs should look exactly the 
> same, but there is something wrong with input 0.  It could be that the 
> imaginary part of the input 0 signal is getting suppressed.  I don't know.
> 
> Here's what I did:  I have a brand new usrp with two basic rx boards.  I 
> connected a signal generator to a four way splitter and then connected the 
> four way splitter directly to the four usrp inputs.  The signal generator 
> was set to 480khz at  -17 dbm.  Then I executed "multi_fft.py -d 100 -f 
> 500000 -g 0".  The attached screen shot shows the problem with input 0.  If 
> I move the signal generator to 520khz, the reflection moves to the other 
> side of zero freq.  If I swap cables on input 0 and input 1, the problem 
> stays with input 0.
> 
> Thanks for your help,
> Hans

Is it reporting any overruns?  I.e., uOuOuOuOuOuOuOuO...

Eric