Nautel VS1, Operation And Maintenance Manual

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VS1 Operations and Maintenance Manual Operating the transmitter
Page 2-56 Issue 3.1 2013-10-01
– HD IPA Volts: for FM+HD, HD and DRM+, enter value, in volts, between 25.0 V and
53.0 V. This value sets the drain voltage applied to the IPA in the RF power modules,
from their associated power supplies. This value affects IBOC/DRM+ performance.
Larger values result in an improved spectrum, but decreased efficiency. Conversely,
smaller values result in improved efficiency, but degrade the spectrum. The default value
is 50 V and typically does not change.
– HD Power Boost: for FM+HD mode only. Enable this setting to engage Nautel’s digital
PowerBoost process, an advanced peak-to-average power ratio reduction that increases
hybrid-mode transmitter efficiency and power capability. HD PowerBoost is only
available in transmitters with the appropriate exciter configuration.
Figure 2.39: Presets - General Tab
Note:
For additional information on operating FM+HD, HD and DRM+ presets, please refer to
Improving Transmitter Performance for IBOC Presets in Section 4 of this manual.