GNU Radio Companion FFT Window

Question

I have a data file that I am trying to run through the GNU Radio Companion FFT Sink.

I have my flow graph set up, no problem there. However, the FFT plot is mostly negative, and the window starts out set to 0->100. I can hit "Autoscale", but my data is only about 15 seconds, and I would like to be able to see all of it from the beginning. Is there a way to set the FFT window to display all the data? Is there some way to make the data show up in the default FFT window? Any other possibilities?

Answer 1

Maybe your FFT plot is negative because the scale is in dB (decibel).