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

[George Edwards]

Hi Fabian,

Thanks for your suggestion!

However, it will not help me because I would like to see the spectrum displayed over the proper range 1GHz +/- 4MHz.

George

On Fri, Feb 3, 2023, 9:06 AM Fabian Schwartau <fabian@opencode.eu> 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

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