Thanks for the answer.

Is that mean if I set the center frequency at 2.5G(RFX2400),the DC is also at 
2.5G?or other values?

 

                                                                                
                      Thank you 
 
> Date: Thu, 5 Aug 2010 10:15:43 -0500
> Subject: Re: [Discuss-gnuradio] what does the "corresponds to DC in the 
> IF"mean?
> From: jasonu...@gmail.com
> To: tianxia...@hotmail.com; discuss-gnuradio@gnu.org
> 
> 2010/8/5 intermilan <tianxia...@hotmail.com>:
> > hi all:
> >       I recently see the "corresponds to DC in the IF" in the function
> > set_freq() of the db_basic.cc.so what does this  sentence mean? In other
> > word, I want to know what is the function of the parameter baseband_freq in
> > the set_freq().I hope someone can help me the figure it out.
> >
> >
> 
> 0 (DC) in gunradio is moved up to whatever center frequency you
> specify in set_freq in the RF circuitry.
                                          
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