NV30/NV40 Operations and Maintenance Manual Operating the transmitter
Issue 3.3 2014-12-10 Page 2-39
Figure 2.29: Power Distribution Plot
Power distribution plot
See Figure 2.29. The exciter measures the relative power levels of the signal and determines the
probability of exceeding a given power level, relative to the average power. The data is plotted in the
Power Distribution Plot as a CCDF (complementary cumulative distribution function). The x-axis
displays the relative power level in dB, with the reference representing the average power. The average
power is 0db. The y-axis displays the probability of exceeding that power level. This plot can be used
to assess the distribution of a given signal, and provides an indication of the amount of peak power
capability required from the transmitter in order to prevent peak clipping/distortion of the output
signal.
Touch on the panel to display a cursor in the approximate area. The cursor position (power gain and
probability index) is noted in the upper, right-hand corner of the panel. Touch in other areas of this
instrument panel to provide a coarse adjustment of the cursor position.
Use the left and right buttons as fine adjustments.
Use the maximize or minimize buttons as required.
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