Well I should have been more patient before I sent out the last email. It
turns out for the functionality I want (flexible zoom in display of the fft
spectrum) the block is called simply "QT GUI sink", if I am not mistaken.
When I tried, there is the error message:
-------------------------------------------------------
Traceback (most recent call last):
File "/home/ldz/usrp_tests/top_block.py", line 75, in <module>
tb = top_block()
File "/home/ldz/usrp_tests/top_block.py", line 58, in __init__
self.top_layout.addWidget(self._qtgui_sink_x_0_win)
File "/usr/local/lib/python2.7/dist-packages/gnuradio/gr/top_block.py",
line 94, in __getattr__
return getattr(self._tb, name)
AttributeError: 'gr_top_block_sptr' object has no attribute 'top_layout'
-----------------------------------------------------------------------------------------------------
I took a look in the top_block.py in my test directory. But I don't
understand the problem. I have not yet become accustomed to the python
environment.
Please off suggestions. Thanks.
LD
On Fri, Sep 28, 2012 at 3:39 PM, Josh Blum <j...@ettus.com> wrote:
>
>
> On 09/28/2012 02:15 PM, LD Zhang wrote:
> > Hello,
> >
> > I have a simple GRC demo where the USRP source goes to a WX GUI FFT sink
> > and WX GUI Scope sink. They appear to be a good tools for sanity checks.
> > One feature I don't find however but I think should be quite necessary is
> > when one needs to examine a portion of the FFT spectrum more closely.
> But I
> > don't find an option where one can specify the start and stop frequency
> for
> > the FFT spectrum display. Am I missing something?
> >
>
> WX FFT sink cant do this. But...
>
> FWIW, the QT gui FFT display sink does have a zoom feature.
>
> -josh
>
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