Lightning Strike

[K7LXC at aol.com]

In a message dated 96-03-19 10:11:46 EST, you write:
>I think you might help a lot of us if you would define a "single point
>ground system".

Hiya, Jim --

   Okay, since you asked.  A single point ground system (SPGS) is a ground
system designed so that all grounded items (ground rods, tower, feedlines,
power, telephone line, etc.) are brought to a common point for connection to
the ground system.  This point is usually a copper bulkhead panel at the
building entry.  This ties everything together to prevent voltage potential
differences in the system.  It is these voltage potential differences that
cause the arcing during a lightning event that we're trying to avoid.  That
way, the lightning surges are kept OUTSIDE the building and bled off
harmlessly into the earth. 

    That's the short answer.  Since there are many books on the subject, I
can't begin to cover it here.  I have additional information that I would be
happy to send you if you send me your postal address; it's only available
right now in hard copy. 

   I'll say it again -- disconnecting your equipment during a lightning
strike may be more psychological benefit than real prevention.

73 and good luck,   Steve    K7LXC 

>From De Syam <syam at Glue.umd.edu>  Tue Mar 19 16:37:29 1996
From: De Syam <syam at Glue.umd.edu> (De Syam)
Date: Tue, 19 Mar 1996 11:37:29 -0500 (EST)
Subject: FW: Contest News Releases - DXpedition
Message-ID: <Pine.SOL.3.91.960319113326.1551B-100000 at lisp.eng.umd.edu>

On Mon, 18 Mar 1996, Joseph M. O'Brien wrote:

> On Mon, 18 Mar 1996 aa2du at netcom.com wrote:
> > On Mon, 18 Mar 96 09:16:00 EST  Zimmerman, Tammy-Beth, KA1WWP wrote:
> > >
> > >The American Radio Relay League
> > >CONTEST NEWS RELEASE
> > >The ARRL Contest Advisory Committee and the ARRL Awards Committee have voted 
> > >in favor of adding DXpedition scores to the club aggregate competition 
> > >totals for active affiliated clubs in the ARRL International DX Contest.
> 
> 
> 	Being new to this debate, could anyone tell me what is the 
> rationale behind this change?   Thanks!
> 
Well I know why I voted for it when, in PVRC, we were asked to indicate 
our opinions:

It will encourage more people to do DXpeditions for the ARRL DX 
Contests, which will fatten the multiplier total for all of us who stay 
behind to participate from here at home.

                                       Very 73,

                                       Fred Laun, K3ZO