User's Manual

FX500R / FX 500 / FX250 Installation cum Operation Manual

Page 18 of 43

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With the understanding of the large obstacle, it helps in the decision of the installation site

with the reduction of the physical obstruction.

2.1.5 Antenna Mast

The antenna unit should be located at least 3-meter away from the ship’s mast having a

diameter of less than 15cm.

For FX 500 ADU, the antenna mast is recommended to be constructed at least 1-meter

height and the mast material must be sufficiently strong to meet the demands of the maritime

environment. The mast should be fitted with a guardrail and platform for the safety of a

service personnel. In most installations, the service personnel stands on the platform when

mounting and checking the antenna radome.

Additionally, it must be designed to meet the following requirements:

 The antenna mast must be able to support the heavy weight of antenna unit (including its

radome mass) and 2.5cm of ice and snow in icing conditions.

 The mast must be able to withstand onboard vibrations and the maximum pitching and

rolling.

 The mast must be able to withstand wind forces on the radome.

 There must have four bolts to be fixed between the mast and the mounting base to

prevent resonance at low frequencies.

The antenna unit must be installed properly on the designed mast with flange. For detailed

dimensions of the mounting flange, refer to Appendix A-3 FX 500 ADU Mast and Flange

Outline Dimensions.

For FX 250 ADU, if the antenna mast is available on the vessel and it is free of any shock or

vibration, its physical size shall support the weight and size of that FX 250 ADU. An example

of the antenna mast is illustrated as below.