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


From: Marcus D. Leech
Subject: Re: How to display a part of the GRC spectrum?
Date: Fri, 3 Feb 2023 11:37:59 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.4.2

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.


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




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