Re: [Discuss-gnuradio] what does the "corresponds to DC in the IF"mean?

[Josh Blum]

On 08/06/2010 12:57 AM, intermilan wrote:
> 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?

Maybe

Due to hardware limitations, the daughterboard may not always achieve 
the desired center frequency, and will therefore leave you with a small 
offset. The FPGA dsp can account for this additional offset by shifting 
your signal to achieve sub-Hz resolution. In addition, you can shift 
your signal again in the host :-)

Sometimes, you intentionally force the daughterboard to have a large 
offset to move the LO out of the band of interest.

-Josh

>                                                                                 
>                        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: address@hidden
> > To: address@hidden; address@hidden
> >
> > 2010/8/5 intermilan<address@hidden>:
> > > 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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