Sema - Also, please be sure you run the calibrations provided by UHD. The TX DC Offset calibration addresses exactly what you are talking about.
http://files.ettus.com/uhd_docs/manual/html/calibration.html Cheers, Ben On Fri, Nov 1, 2013 at 9:04 AM, Mike Jameson <mike.jame...@ettus.com> wrote: > Hi Sema, > > You are most likely seeing the local oscillator at the centre due to the > WBX being a direct conversion daughterboard: > > http://en.wikipedia.org/wiki/Direct-conversion_receiver > > To remove this, you can put the following in the center frequency box of > the UHD source/sink block in GRC: > > uhd.tune_request(uhd_center_freq, > rf_freq=(uhd_center_freq+uhd_lo_offset),rf_freq_policy=uhd.tune_request.POLICY_MANUAL) > > The 'uhd_center_freq' and 'uhd_lo_offset' need to be specified. Set > 'uhd_lo_offset' to be something like ((samp_rate/2)*1.1). > > Regards, > > Mike > > -- > Mike Jameson M0MIK BSc MIET > Ettus Research Technical Support > Email: supp...@ettus.com > Web: http://www.ettus.com <http://www.ettus.com> > > > On Fri, Nov 1, 2013 at 3:21 PM, s k <ofize...@yahoo.com.tr> wrote: > >> Hi all, >> >> I am trying to create a complex cosine signal in 100kHz and transmit it >> with USRP in 110MHz using WBX daughterboard. I have observed this signal in >> an oscilloscope and a spectrum analyzer. It can be seen that there is a >> nonexistent peak at transmit frequency of USRP. I also added the related >> photos to be clear. >> >> Any help would be kindly appreciated. >> >> Sema >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> Discuss-gnuradio@gnu.org >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
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