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Re: [TenTec] RF Ground

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] RF Ground
From: Stuart Rohre <rohre@arlut.utexas.edu>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Wed, 08 Apr 2009 18:20:06 -0500
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
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

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