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Re: [TowerTalk] Crappy LMR600

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Crappy LMR600
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Thu, 24 Aug 2017 10:53:19 -0700
List-post: <mailto:towertalk@contesting.com>
On 8/24/2017 6:25 AM, Keith Dutson wrote:
Turns out that lightning is also a major factor here.  A close strike feeds
secondary arcs to the tower and coax cables.  These arcs can penetrate the
coax jacket, creating pin holes that allow water intrusion.

Right. Good engineering practice is to bond the coax to the tower top and bottom. And control cables should be bypassed to the tower top and bottom. The principle is to put the cables and the tower at the same potential along their length.

  Heliax is not ruined by this intrusion.

This is definitely NOT true. I rescued some 7/8" from a microwave site that has the burns to prove it! The reason it was there to be rescued is that it WAS ruined by a strike -- the inside of the shield was carbonized!

73, Jim K9YC

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