TECHNICAL AREA
 
 

The Navisystem satellite antennas are simple to install but require knowledge of the product itself in order to avoid installing it in the wrong position.

  
     
 
     
 
We would like to point out that all installations must be one by authorised technicians who have followed a special course at Navisystem. In the event of installations executed by non authorised personnel, the product will not be covered by the warranty.
  The antennas must be installed firmly on horizontal surfaces; the installation on curved surfaces may create a mechanical distortion in the internal components causing malfunctions. In the event of an installation on a curved surface, the use of Navisystem AS1000 or AS2000 supports are recommended according to the type of antenna.
 
The installation surface for the antenna must be able to support the weight of the latter without oscillation and in any condition at sea.
 
The presence of magnetic materials close to the antenna may force the latter to interface with the compass on board with NMEA sentence.
 
It is good practice to install the control units close to the satellite receivers to facilitate the use of the system.
  Avoid installing the radar on the path of the satellite dish. It should be installed lower.
  In the event of an obstacle that cannot be avoided, such as the structure holding the radar and other antennas, it will be necessary to install a pair of twin antennas to prevent the structure from impeding the normal operation of the antenna.
 
     
   
     
 
     
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Satellite dictionary
  
 
BIT RATE
  
 

This is the speed of the digital transmission usually indicated in Mb/sec. The quality is directly proportional to the bit-rate. With equal codec, that is a bit-rate of 2.5 Mb/sec will have a greater quality than one of 1.5 Mb/sec, (e.g. with MPEG2).

Comparisons between the various codecs cannot be made because the most recent codecs may have a quality visually higher than the older codecs even with much lower bit-rates.

  
     
 
CAM
  
 
Conditional access module. System used to scramble and descramble programmes via pay satellite.
  
     
 
DECODER
  
 
Device that allows viewing scrambled programmes (crypted).
  
     
 
DiSEqC
  
 
Digital Satellite Equipment Control - Data communication system on coaxial cable. It is used to control the LNB, rotors and switches with a 22 KHz signal modulated by the decoder.
  
     
 
DISH (Piatto)
  
 
The dish of the parabolic antenna that picks up the signal and concentrates it on the focus.
  
     
 
DUAL-FEED
  
 
Signal reception of two satellites with a single dish on which are placed 2 LNB (e.g. Astra and HotBird).
  
     
 
DVB (Digital Video Broadcast)
  
 
European television standard for digital programming.
  
     
 
HDTV (TV ad Alta Definizione)
  
 
System that allows a higher resolution for television programming.
  
     
 
Hot Bird
  
 
The name of the satellite placed at 13º East. The principal broadcasters in the Italian language are on it such as RAI – MEDIASET- SKY ITALIA.
  
     
 
Ku-Band
  
 
Satellite frequency included between 10.7 and 12.7 Ghz.
  
     
 
LNB (Low Noise Block)
  
 
Convert the 12GHZ frequency to pass to a lower frequency (950 – 2050MHZ) more easily transportable on coaxial cables.
  
     
 
NOISE (Rumore)
  
 
Indicates the level of disturbance in a signal.
  
     
 
NOISE FIGURE  (livello rumore)
  
 
The disturbance that a LNB adds to a signal. Indicates the quality of the LNB expressed in dB. If it is lower than this value, the greater the quality of the LNB. LNB can be found today with a 0.2dB noise level.
  
     
 
PPV (Pay per View)
  
 
Pay television generally used for first-run films or sports events.
  
     
 
RICEVITORE
  
 
The appliance that allows descrambling the satellite signal into sound and video – it can be analogue or digital according to the type of desired broadcasts.