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Megasat Seaman 45 Manual

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Setting the LNB skew angleEquipment and cable installation
This oers a general explanation of how to install the IDU and satellite receiver pro-
perly to the inside of vessel connecting with coaxial cable.
Signals transmitted in vertical(red) and horizontal(blue) wave oset exactly 90º from
each other. Since linear satellite signals are oriented in a precise cross pattern, the
Seaman antenna’s receiving element, called an LNB (low-noise block) must be orien-
ted 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.
bad skew Good skew best skew
The correct skew setting varies depending on
your geographic location, since the orientati-
on of your antenna to the satellite changes as
you move. For complete details about adjus-
ting the LNB’s skew angle, see “Appendix A –
How to Set the Skew Angle”
1. The Coaxial cable is routed from the antenna to the IDU inside the vessel.
2. After Once deciding where to place the IDU and satellite receiver, make sure
that both units are placed in a dry and protected area.
3. The IDU and satellite receiver should be placed away from any heat source
and in an area with proper ventilation.
4. Ensure that there are at least 3cm of space around both units for ventilation
and connection of cables. Do not stack the units on top of each other.
5. The following describes the basic wiring congurations for the Seaman an-
tenna system.
• Connect the Coaxial cable to the Seaman antenna port on the back of the
IDU
• Connect one end of the supplied coaxial cable to the receiver port on the
back of the IDU
• Connect the other end of the coaxial cable to the satellite receiver
Figure 2-3 Satellite signals
Figure 2-3 Satellite signals
LNB signal collector
satellite signal
ENGLISH ENGLISH
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