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Re: [TowerTalk] Grounding

To: "towertalk@contesting.com" <towertalk@contesting.com>
Subject: Re: [TowerTalk] Grounding
From: Grant Saviers <grants2@pacbell.net>
Date: Sat, 7 Sep 2019 10:38:10 -0700
List-post: <mailto:towertalk@contesting.com>
Isn't that done in high voltage switchgear centers? I see lots of tall poles with spikes on top.

Also google "oil field lightning protection"

One of my EE professors supposedly got very rich doing this during Texas wildcatting days.

Grant KZ1W

On 9/7/2019 8:39 AM, Richard Smith wrote:
  Is there any value in the idea to put up some kind of structure, fairly far 
away from your antennas, and design it so that it has a better lightning path 
to ground than your towers and antennas??? Could it draw lightning strikes away 
from your towers and antennas?
Trying to think outside the box...
73, Rich, N6KT
     On Thursday, September 5, 2019, 06:43:27 AM PDT, john@kk9a.com 
<john@kk9a.com> wrote:
Lightning is very good at finding a path to ground. make it a more
desirable one.

John KK9A
Sent via the Samsung Galaxy 7 edge, an AT&T 4G LTE smartphone.


On Thu, Sep 5, 2019 at 9:37 AM Chuck Dietz <w5prchuck@gmail.com> wrote:

I had everything disconnected but the ground and a clock on top of an amp.
Lightning surge came through the power lines, through the clock and in to
the amp on its way to ground.
Now I disconnect the ground.

Chuck W5PR

On Thu, Sep 5, 2019 at 8:01 AM <john@kk9a.com> wrote:

What ground??? Do you use a seperate ground going from your radio
chassis to a ground rod? I have my equipment bonded together but no RF
ground and no RFI issues.

John?? KK9A/4


K9MA wrote:


My theory has always been that, with the station equipment well bonded
together, it is safe to leave the ground connected, as long as
EVERYTHING else is disconnected. That leaves no path for current to flow
through anything. I can disconnect the transmitting antennas with one
coax, all the control cables and rx antennas with another big connector,
and power with one 120 and one 240 V plug. That just leaves the ethernet
cable, which I try not to forget.

In any case, my primary goal is to prevent a fire, and disconnecting the
ground from the equipment probably wouldn't help there. I hope I never
have to test that theory.

73,

Scott K9MA

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