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RF vs. Lightning-Protection Grounds

May 22nd Fact-of-the-Day

Some ground systems are installed primarily to make an antenna function correctly, such as where a quarter-wave vertical radiator is fed against a ground system. Some are installed primarily to provide a safe lightning strike current sink. Many are intended for both purposes, but few are adequate for both. The distinction is important, because a ground system that is adequate to make a high-frequency antenna function correctly is rarely adequate to safely sink direct lightning strike currents. Most lightning energy is at very low frequencies. Massive ground systems are required to safely sink high currents at very low frequencies. ©2005 Martek, International. All rights reserved.


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