On 03/02/2023 11:30, George Edwards
wrote:
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
I think we now need more information about your setup. What type of
hardware? I know of no hardware that can deliver
samples at 3Gsps into a host computer that is also compatible with
Gnu Radio.
Processing samples at 3Gsps in an ordinary computer even with
blazing-edge current CPU tech is a "significant challenge",
and you sure as heck aren't going to do it in Gnu Radio.
My *suspicion* is that you're confused about the difference between
the *desired center frequency*, bandwidth, and corresponding
sample rate.
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