Re: [Discuss-gnuradio] Fwd: Guide : what is the value of the IF converted before feeding the ADC in usrp/gnuradio

[ton ph]

Thanks john , what i extracted from the information is that , in usrp the baseband is is centered with IF as close to zero .. right.Is that the IF conversion is same for all the frequencies and bands , and also  how the ADC sampling process reacts to the different data rate baseband data ...
Thanks , and i highly apologies for any mistaken information in my post .
Thanks

On Wed, Apr 13, 2011 at 11:33 AM, Josh Blum <address@hidden> wrote:

On 04/12/2011 10:45 PM, ton ph wrote:
> ---------- Forwarded message ----------
> From: ton ph <address@hidden>
> Date: Wed, Apr 13, 2011 at 11:14 AM
> Subject: Re: [Discuss-gnuradio] Guide : what is the value of the IF
> converted before feeding the ADC in usrp/gnuradio
> To: "Marcus D. Leech" <address@hidden>
>
>
> Thanks Marcus for your immediate reply. Now i have a DBSRX and WBX
> daughterboard , how can i know in what IF it is converted before the ADC, is
> there any other means to check the IF intake of the ADC ? ...
>
> One more thing i would like to know is that , does the IF converted is the
> same for all the frequencies and bands ?
>

For most daughterboards, the IF is usually the tuning error between the
user's requested center frequency and the actual frequency as supported
by the hardware. So the IF is usually close to 0. The user may override
this (in many cases to move the LO out of the spectrum of interest). See
http://www.ettus.com/uhd_docs/doxygen/html/structuhd_1_1tune__request__t.html#af9d2c5fb89c10024b1acae43e88ebe7f

-Josh

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