Ynt: Spectrum Analyzer

Hi,

Actually, I have already created the code. I can scan the entire band with a switch algorithm. Or I can perform a scan according to the frequency ranges I enter.

Thank you for the information that the bandwidth is 56MHz regardless, this was really valuable information and explains why frequency switches at short distances, actually within 56 MHz, also take a short time. 

What I am really curious about is, is there any way to speed up the frequency switch of this board? I accept responsibility for all unsafe ways.

Kind regards,

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Gönderen: Anıl Gürses <anilgurses98@gmail.com>
Gönderildi: 20 Mart 2025 Perşembe 19:30
Kime: Oğuzhan Gedikli <ouzan_ts@hotmail.com>
Bilgi: discuss-gnuradio@gnu.org <discuss-gnuradio@gnu.org>
Konu: Re: Spectrum Analyzer

 

Hi Oğuzhan,

My main goal is to create a spectrum that I can look at between 70mhz - 6ghz. When I set the bandwidth to 6ghz, i can actually see it in a window, but the sample rate of my card is 56mhz. So wouldn't the maximum bandwidth I can see be 56 mhz?

QT GUI sink's bandwidth parameter is used for setting x-axis labels similar to the center frequency parameter. Therefore, the plot you see has 56 MHz bandwidth with wrong x-axis labels. Ref -> https://wiki.gnuradio.org/index.php/QT_GUI_Frequency_Sink

Another Question: Can i build a 6ghz spectrum analyzer on gnuradio without writing any frequency switch algorithm?

You can't. Sweeping the frequencies at a very fast pace presents a performance bottleneck. You can use stream-to-vector, vector-to-stream, and Python blocks to combine samples from different frequencies. Before applying stream-to-vector, you need to upconvert the collected signal. Afterward, you can feed it into the QT GUI sink. However, processing all those samples will take considerable time, especially given the 6GHz bandwidth sweep. This is just a simple, generalized implementation and may omit some steps.

Respectfully,

A.

On Thu, Mar 20, 2025 at 7:07 AM Oğuzhan Gedikli <ouzan_ts@hotmail.com> wrote:

Hello, 

I want to make a spectrum analyzer. i have a USRP. I did this using QT GUI Range. 

My main goal is to create a spectrum that I can look at between 70mhz - 6ghz. When I set the bandwidth to 6ghz, i can actually see it in a window, but the sample rate of my card is 56mhz. So wouldn't the maximum bandwidth I can see be 56 mhz? 

Another Question: Can i build a 6ghz spectrum analyzer on gnuradio without writing any frequency switch algorithm?

Kind regards,