Re: How to display a part of the GRC spectrum?

[Fabian Schwartau]

Am 03.02.23 um 17:08 schrieb Marcus D. Leech:
> On 03/02/2023 11:04, Fabian Schwartau wrote:
> > Hi George,
> >
> > I don't know if the Frequency sink can do that for you, but I guess it 
> > cannot.
> > One way is to mix the signal with a complex oscillation and a 
> > multiplier with the oscillator running at the negative frequency you 
> > wish to downshift the signal. Then low-pass filter and downsample the 
> > signal. You can then feed that into the Frequency sink and also set 
> > you oscillator frequency as offset frequency in the sink's settings.
> >
> > Best,
> > Fabian
> That's pretty-much what the frequency-xlating FIR filter/FFT filter 
> block is for...
Nice to know...
> Also, sampling at 3GHz?  Into an ordinary computer?  Really?
Maybe he is just simulating stuff...
> > Am 03.02.23 um 16:52 schrieb George Edwards:
> > > Dear GNURadio Community,
> > >
> > > Let's say I build a GRC flowgraph operating at a sample rate of 3 GHz 
> > > and wish to display the spectrum over the fixed range of 1GHz +/- 
> > > 4MHz, how do I get the QT GUI Frequency sink to plot over this range?
> > >
> > > Thank you!
> > >
> > > George