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Lightning conductors
Air terminal
arrangement, plan
view
Grounding the
instrument/ antenna
Safety Directions
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 con-
nection 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 alumi-
nium. The height of the air terminals should be 25 cm to 50 cm. All air ter-
minals 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.
a
b
c
GS_039
a
b
c
d
e
GS_040
CAUTION
During the transport, shipping or disposal of batteries it is possible for inappro-
priate mechanical influences to constitute a fire hazard.
Precautions:
▶
Before shipping the product or disposing of it, discharge the batteries by
running the product until they are flat.
When transporting or shipping batteries, the person in charge of the prod-
uct must ensure that the applicable national and international rules and
regulations are observed. Before transportation or shipping contact your
local passenger or freight transport company.
a
Antenna
b
Support structure
c
Air terminal
a
Antenna
b
Lightning conductor array
c
Antenna/instrument connec-
tion
d
Metallic mast
e
Connection to earth
9
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