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

[Hans Glitsch]

Yes


----- Original Message ----- 
From: "Eric Blossom" <address@hidden>
To: "Hans Glitsch" <address@hidden>
Cc: <address@hidden>
Sent: Tuesday, October 23, 2007 5:37 PM
Subject: Re: [Discuss-gnuradio] found problem with std_4rx_0tx.rbf


> 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
>
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