Technical data
Installation
There is no way to provide 100% protection for electronic equipment
from direct strike damage. It is possible however, to reduce the
likelihood of damage from near strike induced fields by ensuring the
installation obeys some fundamental rules.
Lightning arrestors are not 100% efficient, a residual attenuated
electrical pulse being transmitted down the antenna cable, may still
contain sufficient energy to damage equipment within the building.
Therefore, a second lightning arrestor is required at the equipment end
of the cable, preferably where the antenna cable enters the building.
Basic Considerations:-
ENSURING THE MOUNTING BRACKET IS PROPERLY GROUNDED.
This must be achieved by employing a certified, low impedance
connection (a broad, flat lightning conductor strap of sufficient
thickness to provide adequate mechanical durability) able to carry
the thousands of amperes which may flow. Attaching the antenna
mounting clamp onto a pole which is correctly grounded is the
recommended method.
The second lightning arrestor should be mounted where the
antenna cable enters the building and properly grounded to earth
termination.
Implementation
In order to divert the lightening currents induced in the coax cable,
from entering the facilities, we recommend the use of Andrew grounding
kit (not supplied), to connect the shield of the coax to earth termination.
The recommended Andrew grounding kit (not supplied) definition is:
Type 223158 or equivalent.
Installation instructions are included in the grounding kit.
GPS Antenna - Installation Restriction
Case 1
In case that the GPS antenna is installed on location that can expose it
to direct lightning hit.
The installer should use a special accessories set (see Andrew
grounding kit) to ground the coax shield to the "Grounding Plate"
which should be located near the Cables Entrance of the shelter (this
instruction is additional to the regular protection that is recommended
to be used)
GPS Timing Receiver Installation and Operation Manual
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