ProSoft Technology ILX34-AENWG - Manual (Page 78)

PSW-PWD ♦ ProSoft Software Lightning Protection
ProSoft Wireless Designer User Manual
Page 78 of 91
ProSoft Technology, Inc.
July 8, 2009
The optimum place to locate an input protector is at the entry point to the building
where the equipment is located. Do not forget to provide a low impedance
ground connection to the protector as described below. Always try to keep
the lightning and the protection devices outdoors wherever possible!
9.6 Grounding
The most important lightning protection is a good low impedance Earth/ground
connection to the associated equipment. The Earth ground connection should be
a copper plated rod preferably at least 5 to 8 feet in length driven into the ground.
This ground rod should be located as close to the equipment as possible,
typically just outside of a building at the entry point of the antenna feedlines.
Greater protection can be provided by using additional ground rods spaced at
least 8 feet from and connected to the original rod. Substituting plumbing, power
ground return and other "so called" grounds for a ground rod is definitely not
recommended.
Finally, there should be a large diameter (#4 AWG or larger) copper wire
connecting the equipment to the Earth ground. The shorter the wire, the better.
Additional information on grounding can be found in Reference 1.
9.7 Mains and Power Supply Protection
Just because your radio and antenna are miles away from a lightning strike does
not mean that you are protected. Lightning often strikes power lines and
produces a large voltage surge or spike that can be transmitted for miles on the
main power lines.
Therefore, for maximum protection, all power line interfaces should include a
transient voltage surge protector. These devices are becoming quite common
and inexpensive. Again, there are simple protectors and those that may include
additional protection with built-in line inductors. Just make sure that the surge
protector is placed between the power lines and the equipment power supply.
9.8 Summary
As stated at the beginning of this paper, lightning damage can be extensive and
costly. We have tried to provide you with an overview of things to consider when
installing a radio and antenna system but only you can determine how much
protection is required. Astron Antennas Co. has access to various lightning
protection solutions for most applications. Please call for additional information
on lightning protection devices and how they can help protect your investment.
References:
1. "The "Grounds" for Lightning and EMP Protection", by Roger Block, published
by PolyPhaser Corporation.