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

From: Isaac Gerg
Subject: Re: [Discuss-gnuradio] Problem with N200 and waterfall display in grc
Date: Tue, 16 Aug 2011 15:20:27 -0400

I fixed it by ensuring that the sample rates were correct in the blocks.  I was requesting a fs of 100 Hz but was getting something around 190kHz. Once i got these numbers all synced up (to the 190kHz) the blocks worked as expected.


On Tue, Aug 16, 2011 at 1:00 PM, Marcus D. Leech <address@hidden> wrote:
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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