NV30/NV40 Operations and Maintenance Manual Operating the transmitter
Page 2-36 Issue 3.3 2014-12-10
Figure 2.26: AM-PM Correction
AM-PM correction
This panel displays the phase correction being applied to the RF drive signal in order to compensate
for the transmitter’s (IPA +PA stage) phase non-linearity versus the output power. For example, in
Figure 2.26 the transmitter output power is low, so the curve in the plot shows positive phase
correction. Inversely, a negative phase correction will be displayed in the plot given high output
power levels. This correction is represented on the plot via the x-axis (table index value of between 0-
255). The y-axis represents the phase shift correction applied for a given amplitude value.
Touch on the panel to display a cursor in the approximate area. The cursor position (phase and LUT
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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