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Re: [TowerTalk] There's 'ground', and then there's 'ground'

To: David Robbins K1TTT <k1ttt@arrl.net>
Subject: Re: [TowerTalk] There's 'ground', and then there's 'ground'
From: Gary Schafer <garyschafer@comcast.net>
Reply-to: garyschafer@comcast.net
Date: Mon, 17 Jan 2005 12:14:05 -0500
List-post: <mailto:towertalk@contesting.com>
Yes the main reason for keeping them away from the foundation is to keep them in a more moist ground. The ground tends to be much dryer under the eves of the house.

Concrete is not a bad lightning conductor but the foundation wall of a house with a basement will be rather dry.

Lightning is in the range of DC to around 1 mhz so it is not high frequency energy for the bulk of it although some of it does extend higher. Moist ground is a requirement for a good lightning ground.

73
Gary  k4FMX

David Robbins K1TTT wrote:
That is a convenient way to say 'keep them away from the foundation'...
moisture helps for low frequency and low current grounding where ion
conduction is the main conduction method, but does almost nothing for high
frequencies or lightning.


David Robbins K1TTT
e-mail: mailto:k1ttt@arrl.net
web: http://www.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net



-----Original Message-----
From: Alan NV8A (ex. AB2OS) [mailto:nv8a@att.net]
Sent: Monday, January 17, 2005 17:00
To: towertalk reflector
Cc: David Robbins K1TTT
Subject: Re: [TowerTalk] There's 'ground', and then there's 'ground'

I have read that the ground rods should be out from the eaves,
presumably (my guess) because the ground there will stay moister.

Alan NV8A


On 01/17/05 11:38 am David Robbins K1TTT tossed the following ingredients into the ever-growing pot of cybersoup:


Depending on the spacing of the 2 existing rods you could reduce your

ground


impedance by 50% or more with 2 more rods. Maybe a LOT more depending

on


the exact geometry of the situation. Lots of people make a big mistake

by


driving a rod right next to the foundation, you should note that this
reduces the effectiveness of the rod because half of the circle around

it is


cut off by the foundation forcing all the current to go in only one
direction.



_______________________________________________

See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.

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_______________________________________________


See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.

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