Re: [Discuss-gnuradio] Problem with N200 and waterfall display in grc

[Marcus D. Leech]

On 16/08/2011 12:57 PM, Josh Blum wrote:
> On 08/16/2011 08:33 AM, Isaac Gerg wrote:
> > Hi Everyone,
> >
> > I have a USRP N200 rev 2.  I created a simple graph using the gnu radio
> > companion (grc) which is composed of three blocks, a UHD source, a variable
> > slider, and a WX FFT Waterfall display.  When I run this graph, i quickly
> > see the waterfall display fill up with the color blue and then the
> > application becomes unresponsive.  How can I fix this?
> Sounds like the opengl plotter widget is getting overwhelmed. Its
> different on every computer. Try a smaller fft size to shrink the size
> of the on-screen texture.
The usual issue is the frame-rate, not the FFT size.  The default for 
that widget is 15FPS, and since the colourmaps are
  computed (as I recall) in Python, it has a hard time keeping up, 
particularly if the bandwidth is high.