2011/12/4 Nakajo Tomoyuki <nak...@fukui-ut.ac.jp>

> Dear all,
>
> I try to use uhd_fft.py.
>
> The viewing area is displayed, but, no waveform is displayed on viewing
> area.
> Please tell me how to manage the trouble.
>
> A result of uhd_fft.py is below,
>
> --------------------------------------------------------------------
> jupiter@jupiter-Prime-Series:/usr/local/bin$ ./uhd_fft.py -a
> "addr=192.168.10.2"
> linux; GNU C++ version 4.4.5; Boost_104200; UHD_003.004.000-07c9d41
>
> -- Opening a USRP2/N-Series device...
> -- Current recv frame size: 1472 bytes
> -- Current send frame size: 1472 bytes
>
> UHD Warning:
> Unable to set the thread priority. Performance may be negatively affected.
> Please see the general application notes in the manual for instructions.
> EnvironmentError: OSError: error in pthread_setschedparam
> -------------------------------------------------------------------



You are probably receiving a signal too small to be displayed in the
default area of the FFT plot. Try setting the the ref level and dB/step or
scroll (using a mouse wheel) down to see where the signal is.

Tom
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