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Re: [TenTec] Re. [Ten Tec] Grounds

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] Re. [Ten Tec] Grounds
From: Ten-Tec Amateur Radio Sales <sales@tentec.com>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Wed, 25 Jan 2012 09:14:18 -0500
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
I use coax braid with ring lugs on the ends.  I bolt all these together 
with a 1/4 20 nut and bolt.  The yellow ring lugs are the ones that I use.

Stuart Banks
Ten-Tec sales

Stan Brock (WDØBGS)
Ten-Tec, Inc.
1185 Dolly Parton Parkway
Sevierville, TN 37862
Phone: 865-453-7172 ext. 105
Fax: 865-428-4483
Email: sales@tentec.com
Web: www.tentec.com

On 1/24/2012 5:11 PM, George Allgood wrote:
> Hi Stuart.   I keep seeing the word BONDED.  I wonder if that means some
> system other than soldering the conductors together?   What's your method of
> bonding these ground connections?  Thank you.
> ----- Original Message -----
> From: "Stuart Rohre"<rohre@arlut.utexas.edu>
> To:<tentec@contesting.com>
> Sent: Tuesday, January 24, 2012 3:47 PM
> Subject: Re: [TenTec] Re. [Ten Tec] Grounds
>> Technically, a ground wire covered by the deck is a violation of the
>> National Electrical Code.  Likely the rod was there first, and the deck
>> was built over it.
>> Breaker boxes, switched disconnects, panel boards and ground rods must
>> be accessible for inspection and repair.  It is common for ground rod
>> connections to get disturbed by ground shifting, hit by grounds keeping
>> equipment, etc. and thus require the clamp to be tightened over time.
>> The typical house or ham ground rod does little to improve your RF
>> performance, as the inductance of the long lead between the shack ground
>> bus and the electrical entry ground rod will often mean you have a
>> quarter wave situation at the high bands, ie high impedance at one end
>> where your rig connects.
>> Better to put a buried halo ground around the house outside the
>> foundation, and connect, (bond) both electrical grounds and the
>> communications grounds, as well as ham radio ground to it.
>> That way, you have provided a physically short path to earth from any
>> place in the house where the shack might be.
>> Be aware however, everything bonded together, with the case of a less
>> than good conducting earth, that you could have a hit on an antenna mast
>> or tower, bonded to the common bus. The whole of the bonded system will
>> rise to a very high potential, and might conduct harmful currents into
>> equipment bonded to everything else.  We had this happen at the club
>> station:  tower was hit, current came in on shields of coax, (coax was
>> INSIDE the tower), and continued into the shack where it went around the
>> room on our bus bar, up into a VHF radio, and vaporized the circuit
>> board negative power trace before arcing through the power supply to the
>> AC third pin ground path back to the AC utility ground.
>> The ground bus was L shaped around two sides of the room and on the
>> short side went out to a metal water supply piping system.  Everything
>> was bonded to it with wide flat conductors, thus low inductance.
>> All AC outlets were bonded by the AC wiring (3 wire plus conduit).
>> Sometimes it is just going to get you if equipment is left plugged in.
>> Stuart Rohre
>> K5KVH
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