Operations and Maintenance Manual

VS300 Operations and Maintenance Manual Operating the transmitter
Issue 10.0 2019-01-18 Page 2-45
Figure 2.33: Power Distribution Plot
Power distribution
See Figure 2.33. Available only when the transmitter is used with a VSHD exciter. 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.
Click 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. Click on 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.