Waterfall plot - voxo22/hackrf-spectrum-analyzer GitHub Wiki

Waterfall plot is used to display a short history of a spectral graph. It is an excellent tool for capturing events that occur only sporadically, for comparative expression of amplitude ratios, but also for easy identification of waveforms and modulation traces. A color scale, which is displayed on the right side of the spectral chart, is used to express the amplitude. You can set the color scale parameters (initial amplitude and range) on the Waterfall/REC tab. It is also possible to set the scrolling speed of the waterfall as needed, or stop it completely.

The data for the waterfall is derived from the REALTIME trace of the spectral chart. For easier identification of the frequency, a vertical frequency line is displayed when you move the mouse over the waterfall.

In REPLAY mode, a green progress bar is displayed at the top of the waterfall. It shows the current replay position and total recording duration. Click anywhere on the progress bar to jump to a different position in the replay file. Trigger events found in replay can also be shown on the progress bar as orange markers.

Note: Waterfall does not redraw when changing frequency range. Scrolling is continuous and for some time after changing frequency it is still filled with previous data, which gradually disappears.