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Re: [Discuss-gnuradio] HELP : How to use uhd_fft.py


From: Tom Rondeau
Subject: Re: [Discuss-gnuradio] HELP : How to use uhd_fft.py
Date: Tue, 6 Dec 2011 18:06:26 -0500

2011/12/4 Nakajo Tomoyuki <address@hidden>
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,

--------------------------------------------------------------------
address@hidden:/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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