Glossary satellite internet

3
 

   

3-axes  - The Azimuth, Elevation and Cross-level of the VSAT antenna make sure that the antenna is always stabilized and connected with, so keeps receiving signal from, the satellite. Even in a rough sea with lots of waves.

 

   

A
 

 

B
 

ACU - Antenne Control Unit. Controls the VSAT antenna.


ADE - Above Deck Equipment. All equipment, necessary for satellite internet reception, that's placed on top of the deck of the ship, boat or yacht. For instance the VSAT antenna.


Airtime - The subscription ('airtime') needed, in combination with a VSAT antenna, for the reception of internet. A subscription is based on a certain bandwidth and sata speed for unlimited internet access.


Azimuth - The Azimuth, also AZ, is the horizontal pointing of the antenna. The Azimuth is one of the coordinats from the horizontal coordinats system. In this system the position of the satellite is determined by two coordinats: Azimuth and Elevation. The Azimuth is the horizontal factor, or the compass direction: the angle with the North measured from the East.


 

BDE - Below Deck Equipment. All equipment, necessary for satellite internet reception, that's placed below deck of the ship, boat or yacht. For instance the extra routers, the modem, the ACU, etc..


BUC - Block Up Converter. Used for transmitting the satellite signals. This part converts a range of frequencies from a lower frequency to a higher frequency.








C
 

 

D
 

Cross-level - this is the 3rd stabilization factor via the Z-axis, next to Azimuth (X-axis) and Elevation (Y-axis), when pointing the antenna.

 

 

dBi - Antenna gain compared to an isotrope (in all directions the same having characteristics) radiator.

 

E
 

 

F
 

Elevation - The Elevation, in short EL, is the inclination and vertical pointing of the antenna.

 

Elevation - de verticale uitlijning van de schotel

 

 

G

 

H
 

GX - Global Xpress of Inmarsat is the first high-speed broadband internet network with worldwide coverage.


Gyrocompass - a gyrocompass is a gimballes and electric driven gyrotol which hols a certain position. A gyrocompass is preffered above a magnetic compass because of the greater accuracy, the larger directed force, the less error sensitivity and the less failure sensitivity because of for instance other (iron) objects or deviations in the magnetic field.

 

 

 

 

I
 

 

J
 

 

 

 

K

 

L
 

KA-band - the KA-band frequency is from 26.5 - 40.0 GHz. This bandwidth is used for satellite communication connections. The KA-band allows the use of higher bandwidths.

 

KU-band - the KU-band frequency is from 12.0 - 18.0 GHz. This bandwidth is used for satellite communication connections, mainly for fixed and broadcast services.

 

 

LNB - The LNB (Low Noise Block Converter), also LNC called, is the reception head, mounted in the focus of the digital satellite antenna. It gains and converts the satellite signals from the satellite and transport them to the receiver for further processing.

 

 

M

 

N

 

   

O

 

P
 

   

 

Q

 

R
 

   

Reflector - a retro reflector reflects the incoming radiation (radio waves) in exactly the same direction backwards as incoming, having a zero angle of incidence.

 

RX Gain - The gain of an antenna (in any given direction) is defined as the ratio of the power gain in a given direction to the power gain of a reference antenna in the same direction. It is standard practice to use an isotropic radiator as the reference antenna in this definition. Note that an isotropic radiator would be lossless and that it would radiate its energy equally in all directions. That means that the gain of an isotropic radiator is G = 1 (or 0 dB). It is customary to use the unit dBi (decibels relative to an isotropic radiator) for gain with respect to an isotropic radiator.

 

S
 

 

T

 

 

 

 

THOR-7- The most recente satellite, part of the Telenor network. The THOR 7 satellite frequency uses the KA-band frequency.

 

U
 

 

V

 

 

VoIP - Voice over IP (VoIP) uses an IP-network for transporting voice data. This enables telephony via data networks. The traditional seperated worlds of voice and data are integrated into one network in this way.

 

VSAT - Very Small Aperture Terminal. A 'groundstation' (antenna) wireless connected to a communication satellite. The antenne is part of the Above Deck Equipment and requires a free view to be able to make the connection. No obstacles may be in the way, i.e. buildings, trees or other objects, between the antenna and the satellite.

 

W

 

X

WiFi - Wifi (or Wi-Fi) is the name for wireless networks and stands for Wireless Fidelity. This name is given with a twist to the audio term HiFi (High Fidelity).

 

 

 

 

Y

 

Z