Re: [Discuss-gnuradio] Problem with std.ihx

[George Nychis]

> On a somewhat related question, when I do run usrp_fft.py as well as 
> usrp_oscope.py, I'm not able to actually control the GUI - it seems like 
> its "frozen" although I do get some waveforms. At the same time, the 
> string "u0" is continually written to the terminal.
>
> I was also trying to get the FM receiver to work and encountered a 
> similar problem - I get "uA" in the terminal, the GUI is non-responsive, 
> and the graphs look like they're only displaying in an alternating 
> fashion (2-3 seconds for the "Data from USRP" and then a few seconds for 
> the "Post Demod"). I'm just running the script with one option, -f 
> freq1, and I can sort-of make out some semblance of music on the 
> stations I try, but the signal is pretty noisy. I am using an external 3 
> foot antenna, so I'm not really sure what the problem is...

It seems as though your host machine is not able to keep up.  The uO 
refers to USRP overrun, your machine is not keeping up with the incoming 
data and some of it is being dropped.  Given this behavior, you're 
likely not getting a responsive GUI for the same reason.

As a start, try running the oscope with a higher decimation rate like 256:
usrp_oscope.py -d 256

See if you still get overruns, and if the GUI is responsive.

- George