LT-4100 User & Installation Manual Rev 1.00
Installation and Mounting
Lars Thrane A/S
www.thrane.eu
Page 16 of 129
The LT-4130 Antenna Unit should be mounted with free line of sight to the Iridium satellites for best
possible performance. The best location will typically be at the top of the lantern mast, where there are no
obstructions blocking the Iridium satellite link. The LT-4130 Antenna Unit is designed to maintain a
communication link to the Iridium satellites in all weather conditions, see Table 2.
NOTE
:
The LT-4130 Antenna Unit should be mounted with a -22° clear view angle below the
horizontal plan (port and starboard directions), where no obstructions block the Iridium
satellite signal, to maintain full functionality under extreme roll conditions. Also, the upper
hemisphere should be without any blockages to the Iridium satellites.
Extreme Ship Motion Values & Clear View Angles Below the Horizontal Plan
Motion
Direction
Maximum
Amplitude
Iridium Satellite
Acq.
Clear View Angle Below the
Horizontal Plan
Roll
±30°
+8°
-22°
Pitch
±10°
+8°
-2°
Table 2: LT-4130 AU Roll and Pitch Clear View Angles (below the horizontal plan)
Figure 16: LT-4130 AU Installation (roll: clear view angle below the horizontal plan)
