User manual

IRD-2900 Series
Professional Integrated Receiver Decoders
Scopus Documents (p/n 100793) Page 3-15
NOTE
If the specific Viterbi rate is not provided, selecting the Automatic option enables the IRD to automatically detect
the Viterbi rate.
• SPECTRAL INVERSION SETUP
The Spectral Inversion parameter sets the spectral mode of operation.
This parameter is configured according to the information provided from
the broadcast head-end or can be set to automatic.
When set to automatic mode, the IRD-2900 tries the two spectral modes
until obtaining synchronization.
Spectral Inversion
1{ AUTOMATIC
2 INVERTED
3{ NORMAL
The available options are:
• Automatic – Automatically selects between Normal and Inverted
spectral mode
• Inverted – Inverted spectral mode
• Normal – Normal spectral mode
• LNB POWER SUPPLY SETUP
The IRD sets the polarization of the receiving antenna by providing
different voltage levels to the LNB, 13v for vertical polarization and 18v
for horizontal polarization.
The polarization of the receiving antenna is determined according to the
polarity of the satellite transponder.
LNB Power Supply
1{ 13V (VERTICAL)
2 18V (HORIZONTAL)
3{ OFF
The available options are:
• OFF: No voltage is supplied to the LNB. Use this option either when
cascading IRDs using the loop-through connector on the QPSK interface
or when this voltage is supplied to the LNB by external source.
• 13V (Vertical) – Vertical polarization
• 18V (Horizontal) – Horizontal polarization