Re: [Discuss-gnuradio] Questions about the qt frequency display.

[Marcus D. Leech]

> On 04/30/2011 05:07 PM, Marcus D. Leech wrote:
>
> > In situations like this, it's usually helpful to the assembled multitude
> > here to post
> >    your .grc file, to help in diagnosis, or, post a screen-shot of your
> > GRC flow-graph
> >   at least.  Just makes it easier for people to spot the obvious errors.
>
> Well, as I said - I did nothing else but connect a signal source
> (cosine, 1kHz) to the qt sink. Sample rate 44.1kHz, center frequency
> 22050Hz.
>
> In a spectrum display I would expect a spike, well, at 1khz, i.e. pretty
> much left in the display. With 2 signal sources (at 1 and 5KHz), I would
> expect 2 spikes.
> Maybe I didn't get the concept of the qt frequency display right...
> Is it a plain stupid spectrum display or does it do some processing on
> it's own? It also doesn't really seem to matter what I set as bandwidth
> and center frequency. Are those parameters only for the axis labels?
>
The bandwidth is used to determine both the axis labels, and the correct
decimation parameters
  to use to produce the desired display rate.  The center frequency is
purely used set axis labels.

I'd still recommend posting your .GRC file here.



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