Re: [Discuss-gnuradio] question to I and Q routing

[Eric Blossom]

On Wed, Apr 01, 2009 at 08:15:47AM +0000, feldmaus wrote:
> Hi All,
> 
> i have a signal generator which is only connected to 1 SMA connector
> at the LFRX daughterboard.
> In the gnuradio documentation is written:
> "Each of the 4 ADC's can be routed to either of I or the Q input
> of any of the 4 DDC's."
> 
> But if i store the data coming from the usrp to disk, i have got
> real and imag values, which represents the I and Q values.
> So how is the Q part created ?
> Or do i have to create it by connect my signal generator to 2 SMA connectors ?
> 
> My test signal is a sine signal.
> 
> Regards Markus

Markus, these are all great questions, but I have the suspicion that
you haven't studied the USRP FAQ.  For starters please read and
understand:

  http://gnuradio.org/trac/wiki/UsrpRfxDiagrams
  http://gnuradio.org/trac/attachment/wiki/UsrpFAQ/USRP_Documentation.pdf
  Euler's identity
  CORDIC

Thanks!
Eric