Nautel NX15, Operation And Maintenance Manual

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NX15/NX25 Operations and Maintenance Manual Operating the transmitter
Page 2-104 Issue 6.0 2019-01-31
Mag-Phase Delay
The
Mag-Phase Delay
page (see Figure 2.76 ) allows for setting the difference in delay between
the magnitude (PDM) path and phase (RF drive) path in the exciter. Changing this delay can
help to level out and minimize spectral regrowth, providing improved spectral performance
and increased margin under the mask. Typically, the delay is set between 0 and 1 us. Use the
spectrum analyzer instrument panel displayed in this section to verify applied changes are
satisfactory.
The value is factory set and changes are not typically required unless the antenna (load)
network has changed. Minor adjustments may be required to optimize IBOC or DRM spectral
performance. If so, enter the
Phase Delay
value (between -10 us and +10 us) and press
Apply
.
Figure 2.76: Precorrection - Mag-Phase Delay
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