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Re: [TenTec] RF Ground

To: tentec@contesting.com
Subject: Re: [TenTec] RF Ground
From: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Reply-to: geraldj@storm.weather.net, Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Wed, 08 Apr 2009 17:24:19 -0600
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
On Wed, 2009-04-08 at 18:20 -0500, Stuart Rohre wrote:
> If you have a tower 150 feet from the shack, you should not rely on 
> either coax shield or an added copper wire to house,  for bonding the 
> tower to earth.  Use earth rods at the tower, preferably one on each leg 
> to spread out any charge.  Bring off the feeders underground if possible 
> in PVC conduit if you can't afford metal.
> Have provisions for disconnection of feedlines and coax at the entry 
> earthing plate outside the shack when not in use and preferably ground 
> those feeders.  Disconnect electric power from all devices inside the 
> shack when it is not in use.  Don't operate when lightning storms are 
> within 10 miles.  It is common for lightning to travel 10 miles and the 
> direction is not always vertically.  Besides as a storm approaches, wind 
> static builds up charges on antennas that can harm rig inputs.  Such 
> charges have been measured at Field Days on large wire antennas to 
> exceed 600 volts.  This was from a 10mph or less wind!
> -Stuart Rohre
And make those disconnects give at least a couple feet of air gap EVERY
TIME. My shack has been damaged twice when the gap was small. A switch
won't cut it, unless its made to hold off more than 100 KV.

73, Jerry, K0CQ

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