HELP : How to use uhd_fft.py

GNU Radio
#1

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,

[email protected]:/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

–

$BCf>kCRG7(B
$BJ!0f9)6HBg3X!&EE5$EE;R>pJs9)3X2J!&=Z65<x(B
E-mail:[email protected]

#2

2011/12/4 Nakajo T. [email protected]

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