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

From: Firas Abbas
Subject: Re: [Discuss-gnuradio] question to I and Q routing
Date: Wed, 1 Apr 2009 09:21:20 -0700 (PDT)


--- On Wed, 4/1/09, feldmaus <address@hidden> 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

You keep asking about I & Q. From gnuradio Wiki suggested readings, see the 
following book:

"Digital_Receiver_Handbook_Basics_of_Software_Radio.pdf " resource page: 

It is important that you understand the SDR basics specially the DDC.

Best Regards,


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