Multitech GFU19 User Manual download pdf (Page 84)

GS10/GS15, Safety Directions

Lightning

conductors

Suggestion for design of a lightning conductor for a GNSS system:

1) On non-metallic structures

Protection by air terminals is recommended. An air terminal is a pointed solid or

tubular rod of conducting material with proper mounting and connection to a

conductor. The position of four air terminals can be uniformly distributed around

the antenna at a distance equal to the height of the air terminal.

The air terminal diameter should be 12 mm for copper or 15 mm for aluminium.

The height of the air terminals should be 25 cm to 50 cm. All air terminals should

be connected to the down conductors. The diameter of the air terminal should

be kept to a minimum to reduce GNSS signal shading.

2) On metallic structures

Protection is as described for non-metallic structures, but the air terminals can

be connected directly to the conducting structure without the need for down

conductors.

Air terminal

arrangement,

plan view

a) Antenna

b) Support structure

c) Air terminal

GS_039

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Multitech GFU19 User Manual Page 84