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Re: [TowerTalk] Lightnig Arrestors at tower base or house entrance?

To: Larry DiGioia N8KU <>
Subject: Re: [TowerTalk] Lightnig Arrestors at tower base or house entrance?
From: Jim Lux <>
Date: Tue, 26 Feb 2008 05:06:40 -0800
List-post: <">>
Larry DiGioia N8KU wrote:
> Could someone please explain how you can ground a coax shield, on a 
> continuous run down a tower, without letting moisture and humidity get 
> into it? Thanks!
> Larry N8KU

Waterproof N connectors, Female/Female Barrel/bulkhead feedthrough 
that's grounded?


Strip outer insulating jacket off, wrap clamp around, solder, cover 
thoroughly or pot it?

However, I don't know of a way to do it without cutting something.

Something else to think about...

What's the goal here?  Is it to provide a path from top to bottom of 
tower for lightning? I would think the tower is a better path.  Is it to 
  bleed off static type charges?  The shield ground back at the shack 
will do that.  Is it to provide a path for induced current on the shield 
from a nearby strike to get back to ground, without propagating to the 
shack?  Given the fast rise time, maybe just wrapping the coax in a 
grounded sheath is sufficient, and capacitive coupling through the 
jacket will do the rest?  Is it because of some overvoltage issue on the 
shield? Maybe letting the coax be the sacrificial fuse (i.e. let it arc 
through the jacket) might be a good approach?

Just some things to think about...

Jim, W6RMK

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