Nautel GV5, Руководство по эксплуатации и техническому обслуживанию, Страница: 66 / 251

GV5/GV3.5 OPERATIONS & MAINTENANCE MANUAL OPERATING THE TRANSMITTER
VERSION 0.2 2014-07-23 PAGE 3.2.49
Figure 3.2.34: 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 (ePA stage) phase non-linearity versus the output power. For example, in
Figure 3.2.34 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.