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Re: Period doesn't match for frequency sweeping using probe

From: Huang Wei
Subject: Re: Period doesn't match for frequency sweeping using probe
Date: Fri, 3 May 2024 14:24:29 +0100

Hi Adrian and Marcus,

That solved the problem : )
Thank you very much for your help!

Kind regards,

On Fri, 3 May 2024 at 12:31, Adrian Winter <Adrian.Winter@sintef.no> wrote:

Hei Wei,


Try adding a Throttle block to the upper branch too. A quick test shows that if you have two independent data flow paths, the sample rate will be way too high (see log output in the lower left corner: rate is at 300 MS/s



Compare this to the same flowgraph with added throttle in the upper branch:



Now the sample rate is as expected at 32k.


Hope this helps in finding your issue!




From: discuss-gnuradio-bounces+adrian.winter=sintef.no@gnu.org <discuss-gnuradio-bounces+adrian.winter=sintef.no@gnu.org> On Behalf Of Huang Wei
Sent: fredag 3. mai 2024 12:55
To: GNURadio Discussion List <discuss-gnuradio@gnu.org>
Subject: Period doesn't match for frequency sweeping using probe


Hello GNURadio community,


I am trying to generate a sweeping frequency signal. I use a probe to detect a Triangle signal with 1 s period, and measure the level using function probe.

Then I set the frequency of the signal source to 10e6 * func_probe, hoping it starts to sweep from -5e6 to 5e6 Hz with 1 s period. It does sweep between -5e6-5e6 Hz, but with much faster period than 1 s.  Could you please help me to figure out where is the problem for the period mismatch


Thank you very much!




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