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System Components
Direct Broadcast Satellite Overview
Direct Broadcast Service (DBS) satellites broadcast audio, video and data information
from satellites located 22,000 miles in space. A receiving station, such as the Seaman
antenna, should include a dish and satellite receiver to receive the signals and pro-
cess them for use by the consumer audio and video equipment. The system requires
a clear view of the satellite to maximize the signal reception.
Antenna Unit
The antenna unit houses the antenna positioning mecha-
nism, LNB (low noise block), and control elements within
a radome. Weathertight connectors join the power, signal,
and control cabling from the belowdecks units.
IDU (InDoor Unit)
The IDU is the systems user interface, providing access to
the system and its functions through an LCD and three
buttons. The IDU also serves as the vessel’s junction box,
allowing the system to use vessel power, and supply and
receive data to/from the antenna unit.
Objects such as tall lighthouse, bridges and big ship that block this view will cause a
loss of signal. The signal will be quickly restored once the antenna has a clear line of
sight again. Heavy rain, cloud, snow or ice may also interfere with the signal recepti-
on quality. If the satellite signal is lost due to blockage or severe weather condition,
services from the receiver will be lost (picture will freeze frame and may disappear).
When the satellite signal strength is again high enough, then the receiver will resume
providing desired programming services.
Blocked
!
Figure 1-2 Satellite
Blockage
Figure 1-2 Satellite Blockage Figure 1-3 System Components
ENGLISH ENGLISH
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