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 > >
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