Re: [Discuss-gnuradio] Intermediate frequency question

[Brook Lin]

Hi All, 

I am confused on this reply. The reply said that "With the RFX2400, and most
of the high frequency usrp daughtercards,
there is no IF frequency". How is that possible? For RFX2400 the RF range is
from 2.3GHz to 2.9GHz, the ADC rate for USRP1 is 64MS/s. If there is no IF
frequency, the ADC rate is obviously too low. There must be RF front-end on
the daughterboard to tune the RF to the IF. Right? If so, my question is
what the IF is? Obviously, f_IF = f_RF - f_LO. (1) Are we setting the f_LO
when we tune the usrp by usrp.tune(self.u, 0, self.subdev, target_freq)? (2)
How to figure out f_IF for different daughterboards?

Thanks in advance,
Brook



Jason Uher wrote:
> 
>> If I am using RFX2400 then what is the IF frequency and can we change
>> this
>> to some other value? Correct me if the question I asked is wrong.
> 
> With the RFX2400, and most of the high frequency usrp daughtercards,
> there is no IF frequency.  The samples you receive (or send) from the
> usrp.source_x (or usrp.sink_x) are baseband I and Q values.
> 
> Jason
> 
> 
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> 

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