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Re: [TowerTalk] Grounding of cables to tower?

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Grounding of cables to tower?
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Wed, 18 Oct 2017 18:07:12 -0700
List-post: <mailto:towertalk@contesting.com>
On 10/18/2017 4:21 PM, Wes Stewart wrote:
The NEC says of bonding in Article 100: "The permanent joining of metal parts together to form an electrically conductive path that has the capacity to conduct safely any fault current likely to be imposed on it."  By this definition, the coax shield is a bonding conductor.  You're making stuff up.

That's a 60 Hz definition, related to blowing the fuse or breaker. It is NOT a suitable definition for lightning nor for EMC, which demands low impedance at the frequencies of interest. And the frequency of interest for lightning extends well into the MHz range.

73, Jim K9YC

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