Thank you Marcus, thank you everyone! A more fundamental question I have is: Let's assume I was working at a low sample rate, say 32 kHz. Both the QT Freq GUI and the webgui would display a spectrum between -16 kHz +16 kHz. Suppose, I would like the displays to pop-up over the range 5-12 kHz, is there a way to instruct either the QT or webgui block to plot what I consider my range of interest at a sample rate of 32 kHz?
Thanks for all your inputs. Regards, George On Fri, Feb 3, 2023, 9:12 AM Marcus Müller <mmuel...@gnuradio.org> wrote: > First of all, that's a high sampling rate! > > You would want to shift the signal (e.g using the "Rotator" block, or > just by using a signal source at the shift frequency and a (conjugate) > multiplication), then decimate it by a factor of 3 GHz / 8 MHz = 375. > > From a point of view of designing the decimator, decimation by 375 is > quite a mouthful - it requires a filter transition width of > significantly less than 1/375 of the input Nyquist rate. So, it would > seem advisable to do this decimation in a cascade of decimators – in the > extreme case, decimation by 3, by 5, by 5, by 5. > > Best regards, > Marcus > > On 2/3/23 16:52, George Edwards wrote: > > 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 > >
