Are you asking about the IF? The USRP does not really use an IF, it does direct up/down conversion using a rough Hartley modulator/demodulator architecture. When you tell it to plot spectrum over a certain frequency band it will behave like a swept-tuned spectrum analyzer by sweeping through the band-of-interest (BOI) in amounts equal to its bandwidth (datarate / decimation ratio / 2). If you want to see a single band which is within its real-time bandwidth capabilities it sets the local-oscillator to the lowest frequency in your BOI. Then you get, after down-conversion, baseband's DC = f_BOI_min and baseband's max = f_usrp_max_bandwidth. I'm not sure if that answers your question, but please feel free to post a follow-up.
Cheers, -Jonathan Jonathan Friedman Networked and Embedded Systems Lab (NESL) University of California, Los Angeles (UCLA) On Tue, Jun 17, 2008 at 1:43 AM, Naoufel Amri <[EMAIL PROTECTED]> wrote: > Hello everybody > > I work on the usrp_radar_mono.py and I would like to know how the value of > the intermediate FI > in the receive section (downconverter and RFX 2400)! > > thanks for your attention ! > > Naoufel > > > ------------------------------ > Envoyé avec Yahoo! > Mail<http://us.rd.yahoo.com/mailuk/taglines/isp/control/*http://us.rd.yahoo.com/evt=52423/*http://fr.docs.yahoo.com/mail/overview/index.html> > . > Une boite mail plus intelligente. > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
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