Re: [Discuss-gnuradio] about uhd_fft.py

[Andrew Davis]

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 <address@hidden> 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
>
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