Andrew Sorry for the late reply. I am using SBX daughterboard.
The attachments I included earlier are inaccurate and seems like I was see that output because I was terminating uhd_fft file using ctrl+c Right now I have my noise level at -110dB and I can see different carriers. The only ambiguity I am facing is that as I change by center frequency by 0.0001GHz I see some carriers gone and different ones emerged at various frequencies. This is happening in every band. On Thu, Mar 8, 2012 at 7:24 PM, Andrew Davis <glneolistm...@gmail.com>wrote: > The thing in the center is caused by a lot of things, like IQ > imbalances and the distribution of noise towards zero etc. We all get > it when the gain is high. Do you have something you are trying to > detect? Do you have an antenna connected to the right port? What > front-end board are you using? Try 100MHz and look at some local radio > stations. > > On Thu, Mar 8, 2012 at 8:47 AM, Orkhan Badirkhanli <orxan...@gmail.com> > wrote: > > Hello > > > > I've just successully installed gnuradio and connected my new USRP n210. > I > > run uhd_fft.py to test my hardware and it all works well, I activity in > the > > spectrum. > > > > The thing is, whatever I set the center frequency, all I see is a > carrier at > > that center frequence at -50dB and "noise" at other frequencies at > -70dB. I > > have included 2 screenshots with center frequencies of 2.4G and 2.4001G, > the > > situation is the same in both of them. > > > > I thing there is something really wrong with this. Besides, I remember a > few > > time when I ran uhd_fft.py file, I saw noise at -110dB and several > carriers > > at different frequencies. But that carrier at center frequency was there > > too. > > > > I appreciate any help > > > > Thanks > > > > -- > > Orkhan > > > > _______________________________________________ > > Discuss-gnuradio mailing list > > Discuss-gnuradio@gnu.org > > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > -- Orkhan
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