Nautel NX25, Operation And Maintenance Manual

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NX300 Operations and Maintenance Manual Operating the transmitter
Page 2-98 Issue 3.0 2012-11-01
Mag-Phase Delay
The
Mag-Phase Delay
page (see Figure 2.74 ) 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 2.74: Precorrection - Mag-Phase Delay
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