Re: [Discuss-gnuradio] A medley of questions

[Eric Blossom]

On Wed, Mar 14, 2007 at 05:54:03PM -0400, Steven Clark wrote:
> >> I'm using usrp_rx_cfile.py. So hopefully I'm just looking at the raw
> >complex
> >> baseband coming across USB.
> >
> >No surprise, you're not sampling at the center of the symbols.
> >
> 
> 
> Eh? I'm using the -f command line argument to tune the USRP to the center of
> my signal.

There is always an unknown phase between the transmitter and receiver.
In addition, the clocks between the transmitter and receiver are never
running at exactly the same frequency.  FWIW, the oscillator on the
USRP is spec'd to 50ppm.

Eric