8
Glossary
ACU
Antenna Control Unit. Used to control the antenna and provide the vessel with internet
access.
Azimuth
The horizontal angle a parabolic antenna must be rotated to, in order to point to a
specific satellite in the orbit. It is defined with respect due to north for convenience.
Elevation
The vertical angle that a parabolic antenna has to set to point to a specific satellite in
the orbit. Elevation is zero when the antenna points to the horizon.
GPS
Global Positioning System
IDU
Indoor Unit
Ku-Band
The frequency range from 10.7 to 18GHz.
LNB
A Low Noise Block is used for reception (downlink) of satellite signals. It down-
converts a block of high range frequencies to lower range. So LNBs convert Ku Band
frequencies to L Band.
NMEA
Communication standard for marine instruments
ODU
Outdoor Unit (Antenna)
Skew
Skew is the tilt of the LNB in order to align the planes of polarization of antenna & the
satellite.
UPS
Uninterrupted Power Supply. Online type is recommended for EPAK systems.
SNR
The ratio of signal power to noise power, expressed in dB. The higher the SNR, better
the signal quality.
TVRO
Maritime TV receive Only System antenna
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Summary of Contents for DS13 PRO
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