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

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] Problem with N200 and waterfall display in grc
Date: Tue, 16 Aug 2011 13:00:46 -0400
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:5.0) Gecko/20110624 Thunderbird/5.0

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.

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