John,
Thanks for your comments on the ground.
For the 160, best you kick off a separate thread for that. Comingling
subjects makes it very hard for anyone to follow the thread.
73/jeff/ac0c
www.ac0c.com
alpha-charlie-zero-charlie
-----Original Message-----
From: john nistico
Sent: Tuesday, January 22, 2013 8:06 PM
To: K1TTT ; towertalk@contesting.com
Subject: Re: [TowerTalk] bonding to AC power box or inside fuse panel?
According to the underwriter lightning suppression course I took the proper
way is to run as long a length of bare copper wire in the ground. giving the
strike as much area to dissipate as possible. Also cad welding the wire to a
10 ft ground rod every 50 to 100 feet is highly recommended. And not to
change the subject but can i get an opinion for this weekends 160 contest?
I have a customer with a 180ft support I can use to hold up an antenna.
Should i put up an inverted v or a vertical with 4 ground radials 135 ft
long. the feed point will be 50 ft above the ground. Thanks.
John J. Nistico
911 Electric Inc.
516.356.6071
From: K1TTT@ARRL.NET
To: towertalk@contesting.com
Date: Wed, 23 Jan 2013 00:24:53 +0000
Subject: Re: [TowerTalk] bonding to AC power box or inside fuse panel?
Yeah, but radial wires start to lose effectiveness for dissipating
lightning
past about 50' or so. You would be better off to take that 175' and cut
it
in 3 or 4 pieces and lay them out like radials under the tower.
The connection between my towers and the shack ground system consists of
100' to 500' lengths of guy wire or aircraft cable holding up the multiple
runs of hardline going to each tower or remote antenna. I agree that the
shield(s) of the hardline is probably a much better equalizer than a
buried
wire over those distances.
David Robbins K1TTT
e-mail: mailto:k1ttt@arrl.net
web: http://wiki.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://k1ttt.net
-----Original Message-----
From: john nistico [mailto:electric911inc@hotmail.com]
Sent: Wednesday, January 23, 2013 00:11
To: Vincent Weal; wc1m73@gmail.com
Cc: towertalk@contesting.com
Subject: Re: [TowerTalk] bonding to AC power box or inside fuse panel?
When it comes to lightning protection more is better. If the 1/0 copper
wire
was bare in the trench it would dissipate a lightning strike much better.
This is what we do on houses all the time.
John J. Nistico
911 Electric Inc.
516.356.6071
> Date: Tue, 22 Jan 2013 17:37:34 -0500
> From: k4jc@arrl.net
> To: wc1m73@gmail.com
> CC: towertalk@contesting.com
> Subject: Re: [TowerTalk] bonding to AC power box or inside fuse panel?
>
> Dick, I want to thank you for this post. I have been trying to find an
> answer to this question for years, but no one seemed to have a
> definitive answer. Can you tell me where I can find the article you
referred to?
>
> My tower is going to be 175 feet from the shack and I wasn't looking
> forward to dropping all that dough on grounding wire!
>
> 73, Vince K4JC
>
> > -----Original Message-----
> >"Another example is bonding the tower ground to the single-point
> >ground at
> the house. My first tower farm is 265' from the house. Being new to
> tower construction, I laid 265 feet of 1/0 ground wire in the trench
> running between the two locations in order to bond the ground systems.
> This was not cheap, to say the least (though it was before the big run
> up in copper
> prices.) Later, I read an article by Polyphaser that said if the
> ground systems are more than 75' apart it does no good to bond them --
> the wire inductance will be too high to make an effective connection.
> With this in mind, when I installed my second tower system in a
> different
location 220'
> from the house, I did not run a separate ground wire. The Polyphaser
> argument made sense to me. Also, there are two runs of 1-5/8" hardline
> in the trench, and the gigantic copper shields on those babies surely
> provide a lower inductance path between the tower and house than a 1/0
> wire would
> -- if, in fact, any wire has low enough inductance at that length to
> be effective.
>
> 73, Dick WC1M"
> _______________________________________________
>
>
>
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