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 By the way, I can barely decipher your screenshot. I strongly recommend using the screenshot functionality of your operating system instead of using a camera to digitize the analog lightwaves that were generated from a screen that converted the digital picture to light... that being said, I don't really understand your question The time between rise and fall is known since it is plotting it on the time axis, So: What is the very definition of "frequency"? Right, it's the rate at which a periodic thing happens. so you measure the time distance between two rising edges, and do 1/that, and instantly have the frequency. That's a very "analog measurement device" or "cycle counting" way of doing this. oscilloscope calculates and displays a frequency number. Hm. What do *you* think the oscilloscope does? Dan's recommendation was absolutely on-spot. Use a spectrum/fft sink. If you don't understand what "spectrum" is, read a bit wikipedia :) That's really the easiest way I could think of. Other than that, read up on autocorrelation, and how to calculate it in a DSP system. Best regards, Marcus On 12.05.2016 22:38, Rob Croce wrote: OK thanks.  I just need to display a number for the frequency of the pulses.  The time between rise and fall is known since it is plotting it on the time axis, so I am wondering if there is anyway I can extract frequency that way.  Similar to frequency counting on a micro, or how an oscilloscope calculates and displays a frequency number. On Thu, May 12, 2016 at 4:30 PM, Dan CaJacob wrote: I would need more details about what you're trying to accomplish, but my first reaction would be to attach an FFT GUI sink. On Thu, May 12, 2016 at 4:26 PM Rob Croce wrote: Hi all.  I have transient pulses that I am displaying using the transient plot, and I am wondering how I can display the frequency of the pulses.  The duty cycle is similar for all pulses, just the frequency is varying.  Is there a simple way to do this?   _______________________________________________ Discuss-gnuradio mailing list address@hidden https://lists.gnu.org/mailman/listinfo/discuss-gnuradio -- Very Respectfully, Dan CaJacob ```_______________________________________________ Discuss-gnuradio mailing list address@hidden https://lists.gnu.org/mailman/listinfo/discuss-gnuradio ```