FLEX-6000 Signature Series - SmartSDR for Windows Software User’s Guide
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37.5.2 Waterfall Definition
A Waterfall is a historical representation of the frequency data over time. Frequency is listed along
the horizontal axis from lower to higher frequency, from left to right, measured in Megahertz (MHz).
Time is listed on the vertical axis where the most recent data is at the top and the oldest data is on
the bottom.