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Re: [Discuss-gnuradio] GRC problem: window turns grey after executed

From: Markus Heller M.A. (relix GmbH)
Subject: Re: [Discuss-gnuradio] GRC problem: window turns grey after executed
Date: Tue, 02 Nov 2010 18:18:15 +0100

Hi Rachel, this looks like a system overload. The source generates too
much data so that the cpu will not leave any cycles for the rest of the

In the category "misc" there's a block called "throttle". Use it before
the FFT block. It will reduce the number of samples that will go into
the FFT. So the FFT function has less work. 

I also recently got involved with gnuradio the first time. Have a look

      * http://www.csun.edu/~skatz/katzpage/sdr_project/sdr/grc_tutorial2.pdf
      * http://www.csun.edu/~skatz/katzpage/sdr_project/sdr/grc_tutorial3.pdf
      * http://www.csun.edu/~skatz/katzpage/sdr_project/sdr/grc_tutorial4.pdf

This is a fantastic tutorial that should help you around these hurdles. 


Am Dienstag, den 02.11.2010, 13:05 -0400 schrieb Rachel Li:
> Hi all:
> I am using GRC 3.3 on ubuntu 10.10. After I "generate" and "execute"
> the flow diagram, the graphical sink window will show up (e.g. FFT
> skin or Scope sink). However, everything in this window will turn grey
> after a few seconds and I am not able to click any button in the
> window. When I tried to close it , it says "The window ...... is not
> responding".
> Does anyone have the same problem? Please help!!
> Thanks a lot!
> Rachel
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