Nautel NX15, Operation And Maintenance Manual

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NX15/NX25 Operations and Maintenance Manual Operating the transmitter
Page 2-38 Issue 6.0 2019-01-31
Figure 2.23: Lissajous Plot
Lissajous plot.
See Figure 2.23 . This panel displays a Lissajous figure that represents either L
(left) and R (right) audio content or a representation of the digital modulation signal [I (in-
phase) and Q (quadrature)]. I and Q will be automatically selected unless you are operating in
stereo mode or not operating digital. Left and right audio content is displayed for all other
audio sources.
The plot consists of a group of sequential samples to allow signal analysis. In L and R mode,
the L+R portion of the signal tends to dominate the plot, resulting in the majority of samples
appearing in the lower, left and upper, right quadrants. In I and Q mode, signals that are of
equal frequency and 90 degrees out-of-phase result in a circular display.
Use the up or down button to maximize (if it was minimized) or minimize (if it was
maximized) the panel size.
L and R mode
I and Q mode