Nautel VSHD Exciter, Инструкция по эксплуатации

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VSHD Exciter Technical Instruction Manual
Page 3-3
Section 3 Operation Issue 2.0
Figure 3-3: AM-PM Correction
AM-PM correction (see Figure 3-3): 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. In Figure 3-3 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 Table index) is noted in the upper, right-hand corner of the panel. Touch in other areas
of the instrument to provide a coarse adjustment of the cursor position.
Use the left ( ◄ ) and right ( ►) arrow buttons as fine adjustments.
Use the up ( ▲ ) arrow button to maximize (if it was minimized) or the down ( ▼ ) arrow button
to minimize (if it was maximized) the panel size.