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Technical
Overview
15
LNB
The LNB converts the 12.2 GHz to 12.7 GHz downlink signal fi'om the satellites to
the 950 MHz to 1450 MI-Iz signal required by the receiver tuner. Two types of LNB's
are available
- dual and single output.
The single output LNB has only one RF
connector
while the dual output LNB has two, figure 7. The dual output LNB can be
used to feed a second receiver or other form of distribution
system. TheBasic package
comes with the single output LNB. The Deluxe package comes with the dual output
LNB.
SINGLE OUTPUT LNB
DUAL OUTPUT LNB
Figure 7, Single and Dual output LNB's
Both types of LNB's can receive both left and fight-hand polarized signals. Polariza-
tion is selected electrically via a DC voltage sent on the center conductor of the cable
from the receiver. Right-hand polarization is selected with +13 volts and left-hand
polarization is selected with +17 volts.
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