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Operation
Setting the LNB skew angle
Signals transmitted in vertical(red) and horizontal(blue) wave offset exactly 90º from
each other. Since linear satellite signals are oriented in a precise cross pattern,
the antenna’s receiving element, called an LNB (low-noise block) must be oriented in the
same way to optimize reception. This orientation adjustment is referred to as the LNB’s
“skew angle.” Figure 1-4 illustrates how skew determines the amount of signal the LNB
collects. The more signal, the better the reception.
The antenna system is easy to use. Under normal conditions, operation of the antenna
requires no intervention from the user. Antenna unit initialization and satellite acquisition
is completely automatic.
Receiving Satellite TV Signal
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Turning the System On/Off
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Changing Channels
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Watching
TV
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Switching between Satellites
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Operating the IDU
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Receiving Satellite TV Signals
Television satellites are located in fixed positions above the Earth’s equator and beam TV
signals down to certain regions of the planet. To receive TV signals from a satellite, you
must be located within that satellite’s unique coverage area. To check it, see “Appendix
B – Satellite Coverage Map” In addition, since TV satellites are located above the equator,
the antenna must have a clear view of the sky to receive satellite TV signals. Anything
that stands between the antenna and the satellite can block the signal, resulting in lost
reception. Common causes of blockage include lighthouses, boat masts, trees, buildings,
and bridges. Heavy rain, ice, or snow might also temporarily interrupt satellite signals.
Turning the System On/Off
Since power to the antenna system is controlled by the IDU, you can turn the antenna on
or off by applying/removing operating power to the IDU
The correct skew setting varies depending on your geographic location, since the orien-
tation of your antenna to the satellite changes as you move. For complete details about
adjusting the LNB’s skew angle, see “Appendix A – How to Set the Skew Angle”
Figure 2-3 Satellite signals
LNB “signal collector”
Bad skew
Good skew
Best skew
Satellite Signal
Summary of Contents for Caravanman 85 Professional
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