Re: [Discuss-gnuradio] Vector Source in GRC

[Josh Blum]

what frequency is the sine wave? You are probably looking at a slight 
frequency offset due to the hardware. You may want to try giving each 
usrp2 a common reference clock.

-josh

Scott Monteith wrote:
> Josh
>
> Thanks for the suggestion.  It looks like you were right with it
> clipping, and scaling it down did the trick.
>
> Now, when looking at it on the other machine, running usrp2_fft.py -S,
> the signal (for the vector [0.1], repeating) is a sine wave.  What is
> making it this?
>
> Thanks again
> Scott
>
> On Mon, Jan 11, 2010 at 12:16 PM, Josh Blum <address@hidden> wrote:
> > I bet you are clipping, try scaling those numbers down to say 0.2. The range
> > of the input on the usrp2 is -1 to 1
> >
> > -josh
> >
> > Scott Monteith wrote:
> > > I'm having trouble transmitting using the vector source in GRC.  I
> > > have it sending [1+1j, 1-1j, -1+1j, -1-1j], repeated, to a USRP2 sink
> > > and scope sink.  When run, the information on the scope sink (locally)
> > > looks correct.  However, on a second host machine with a another USRP2
> > > connected, the scope output looks like noise.  By comparison, using a
> > > signal source transmits the expected values (cosine) properly.
> > >
> > > I did have to change the default value of 1 for the amplitude to a
> > > lower value in the cosine signal source for it to transmit properly,
> > > but there was no similar option for that on the vector source.  Could
> > > this be the issue?  Any other ideas or suggestions?
> > >
> > > Thanks for the help!
> > > Scott
> > >
> > >
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>
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