Nautel VS300, Operation And Maintenance Manual

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VS300 Operations and Maintenance Manual Operating the transmitter
Issue 8.0 2016-03-01 Page 2-43
AM-AM and AM-PM correction screens
Available only when the transmitter is used with a VSHD exciter. When the transmitter is operating
with digital carriers, the exciter linearizes the transmitter’s RF drive signal by performing adaptive pre-
correction. There are two correction parameters -
AM-AM Correction
(see Figure 2.30 ) and
AM-PM
Correction
(see Figure 2.31 on page 2-44 ), which can be viewed as instrument panels.
Figure 2.30: AM-AM Correction
AM-AM correction
This panel displays the amplitude correction being applied to the magnitude signal. The x-axis
represents the signal amplitude and the y-axis represents the gain correction applied for a given
amplitude value.
Click on the panel to display a cursor in the approximate area. The cursor position (gain and LUT
index) is noted in the upper, right-hand corner of the panel. Click in other areas of the instrument to
provide a coarse adjustment of the cursor position.
Use the left and right buttons as fine adjustments.
Use the up or down button to maximize (if it was minimized) or minimize (if it was maximized) the
panel size.