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Re: How to display a part of the GRC spectrum?
From: |
Glen Langston |
Subject: |
Re: How to display a part of the GRC spectrum? |
Date: |
Fri, 3 Feb 2023 11:11:44 -0500 |
Hi George and Marcus,
Yes I agree with Marcus, the Frequency Xlating FIR filter works surprisingly
well.
https://wiki.gnuradio.org/index.php?title=Frequency_Xlating_FIR_Filter
I’ve run some tests with placing (Simulating) audio tones at high frequencies
ie 1MHz
+ 880 Hz and the tone is perfectly preserved
at 880 Hz after XLating.
Glen
> On Feb 3, 2023, at 11:08 AM, Marcus D. Leech <patchvonbraun@gmail.com> wrote:
>
> 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...
>
> Also, sampling at 3GHz? Into an ordinary computer? Really?
>
>
>>
>> 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
>>
>>
>
>
Re: How to display a part of the GRC spectrum?, Marcus Müller, 2023/02/03