RuCd - Spectogram Display

The spectrogram display uses colours to indicate the amplitude of the signals, with red meaning a higher amplitude and blue being lower. 

Use the Up/Down cursor keys to move the cursor Up/Down through the Y-axis of recorded RPM speeds.

Use the Left/Right cursor keys to move the cursor Left/Right along the X-axis of the selected frequency scale.
Other items available are:

* HELP - opens the help menu

* WATERFL - display the same data as a waterfall 

* EDIT - return to the spectogram display setup menu

* SAVE - save the Spectogram data as a CSV file

* BACK - return to the Spectogram Setup menu
