[R-390] Grounds

[wb5uom at hughes.net]

This has been good reading. Thanks!

I have 23 tower installations of my own and cant cout how many more of
Customers sites that we take care of . Ive got some sites grounded to the
hilt and still take hits from time to time. I have others with no grounding
at all that never get hit.

There was(is) this large oil company, and several years ago they had a new
Communications Manager take over. He had been in the Middle East for years
and came in to our office one day requesting a "tour" of his sites in this
area.

The first words out f his mouth upon entering one of the radio Comm
buildings was "Get those grounds off my equipment. I do not want  any of my
equipment OTHER THAN the shield of coax's grounded at the point of entry on
the outside of the building."

And I have to say, it did not seem to get any worse afterwards and  it is
still that way today.

David/WB5UOM


----- Original Message ----- 
From: "rbethman" <rbethman at comcast.net>
To: <R-390 at mailman.qth.net>
Sent: Sunday, August 02, 2009 5:19 PM
Subject: Re: [R-390] Grounds


> This is a "rough" play for Amateur Radio installations.
>
> Tisha provided EXTREMELY GOOD reference material!
>
> Consider it a PERMANENT fixture on my site!
>
> Bruce, Dave, Dave, Cecil, myself, and others have contributed information.
>
> Roger pointed out the power dissipation being measured in Joules.  Some
> strikes will boggle the imagination!
>
> Bruce spoke of STILL losing some items.  I don't think it IS possible to
> be absolutely safe from a strike no matter WHAT we do.
>
> Do YOUR *BEST*!
>
> Bob - N0DGN
>
> Bruce Ussery wrote:
> > <SNIP>
>
> > Experience helps I imagine.
> > Thanks to all for the good information.
> >
> > Bruce
> > WA4ZLK
> >
> > Dave Maples wrote:
> >
> > All: The NEC is correct in this case.  All the grounds need to be
connected
> > together with large-gauge wire, so that any surge current (whether
direct or
> > induced) cannot set up a large potential difference between the ground
> > systems.
> > <SNIP>
> >
>
> > This is a large condensation of guidance we received from both
Polyphaser
> > and equipment vendors.
> >
> >
> >
>
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