Re: [Discuss-gnuradio] QT waterfall sink manual intensity

[Louis Brown]

I'm using just the waterfall sink.  The spectrum is slightly oversampled so I 
see the decimation filter roll off to -170 dB and the edges, thus I'd like to 
set the intensity minimum at the passband noise floor which is up at -100 dB.  
The auto scale always catches -170 dB at the edges.  

I'll try editing the Python script directly to access the 
set_intensity_range(double min, double max) of the object, unless there is a 
way to do it in GRC.

Thanks,
Lou
KD4HSO


On Feb 25, 2014, at 10:28 AM, Tom Rondeau <address@hidden> wrote:

> On Mon, Feb 24, 2014 at 10:38 PM, Louis Brown <address@hidden> wrote:
>> Is there way to manually scale the intensity of the QT waterfall sink, in 
>> other words, set the dynamic range and reference level like the WX sink?
>> 
>> Adjusting the time axis with the scroll wheel alters the intensity axis, but 
>> the actual color values don't change.
>> 
>> Thanks,
>> Lou
>> KD4HSO
> 
> 
> Just to make sure, are you using the QTGUI "sink" (the one with tabs
> for the different types of plots) or the "waterfall sink" (with /just/
> the waterfall). If the former, there should be two bars for the upper
> and lower intensities that will affect the colors.
> 
> If using the waterfall plot directly, we haven't instrumented the
> min/max from the gui directly (to avoid clutter). However, the object
> does export the set_intensity_range(double min, double max) that you
> can use to directly control these.
> 
> Alternatively, with this plot, if you middle-click on the mouse, the
> drop-down menu offers an Auto Scale feature that will adjust the
> dynamic range based on the min/max values in the current plot. I've
> found that to be the most useful way to control the intensity.
> 
> Tom